GPS 175

GNC 355
GNX 375
Pilot's Guide
COPYRIGHT & TRADEMARKS
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SOFTWARE VERSION
This manual reflects the operation of system software v3.01. Some differences in
operation may be observed when comparing the information in this manual to later
software versions.

INFORMATION & SUPPORT

For information regarding the Aviation Limited Warranty, refer to Garmin’s website.
For aviation product support, visit flyGarmin.com.
 Table of Contents

1 SYSTEM AT A GLANCE ..................................................................................................... 1-1

Overview ...................................................................................................................................................1-2
1.1 Display Layout ........................................................................................... 1-3
1.2 Unit Functions .......................................................................................... 1-4
Pilot Interface ........................................................................................................................................1-5
1.3 Unit Power ................................................................................................ 1-5
1.3.1 Instrument Test .................................................................................. 1-5
1.3.2 Power Off .......................................................................................... 1-5
1.4 SD Card Slot ............................................................................................. 1-6
1.5 Touchscreen ............................................................................................. 1-7
1.5.1 Keys ................................................................................................... 1-8
1.5.2 Menus ................................................................................................ 1-9
1.5.3 Tabs ................................................................................................. 1-10
1.5.4 Keypads ........................................................................................... 1-10
1.6 Control Knobs ........................................................................................ 1-11
1.6.1 Knob Functions ................................................................................ 1-11
1.6.2 Page Navigation Labels ..................................................................... 1-12
1.6.3 Knob Function Indicators .................................................................. 1-12
1.6.4 Knob Shortcuts ................................................................................ 1-13
1.6.5 Screen Captures ............................................................................... 1-15
1.7 Color Conventions .................................................................................. 1-16
Compatible Equipment ..................................................................................................................1-17
1.8 Line Replaceable Units ............................................................................ 1-17
1.8.1 ADC & AHRS .................................................................................... 1-17
1.8.2 Altitude Encoder .............................................................................. 1-18
1.8.3 ADS-B In Data .................................................................................. 1-18
2 GET STARTED ........................................................................................................................ 2-1
Databases .................................................................................................................................................2-2
2.1 Database Effective Cycles .......................................................................... 2-3
2.2 Active and Standby Databases .................................................................. 2-4
2.3 Manual Updates ....................................................................................... 2-5
2.3.1 Database Updates Page ...................................................................... 2-5
2.4 Automatic Updates ................................................................................... 2-8
2.5 Database Concierge .................................................................................. 2-9
2.5.1 Wi-Fi Setup ...................................................................................... 2-11
Connectivity .........................................................................................................................................2-12
2.6 Connext Setup ........................................................................................ 2-12
2.7 Bluetooth Setup ...................................................................................... 2-13
2.7.1 Enabling Bluetooth Functionality ...................................................... 2-13
2.7.2 Managing Paired Devices .................................................................. 2-14
2.7.3 Importing a Flight Plan ..................................................................... 2-14
COM ..........................................................................................................................................................2-15
2.8 COM Standby Control Panel ................................................................... 2-15
2.8.1 COM Volume Controls ..................................................................... 2-16
2.9 COM Radio Setup ................................................................................... 2-18
2.9.1 Channel Spacing Option ................................................................... 2-19
2.9.2 Reverse Frequency Look-up .............................................................. 2-20
2.9.3 Sidetone Volume Offset ................................................................... 2-21
2.10 Tuning & Monitoring ............................................................................ 2-22

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2.10.1 Direct Tuning ................................................................................. 2-23

2.10.2 Transfer Frequency to Active (Flip-Flop) ........................................... 2-25
2.10.3 Monitor Mode ................................................................................ 2-26
2.11 Frequency Selection .............................................................................. 2-27
2.11.1 Search Tabs .................................................................................... 2-27
2.11.2 Remote Frequency Selection ........................................................... 2-29
2.11.3 Emergency Frequency ..................................................................... 2-29
2.12 Create User Frequencies ........................................................................ 2-30
2.13 COM Alert ............................................................................................ 2-32
2.13.1 Stuck Microphone .......................................................................... 2-32
XPDR ........................................................................................................................................................2-33
2.14 XPDR Control Panel .............................................................................. 2-33
2.15 XPDR Setup .......................................................................................... 2-34
2.15.1 Displaying Data .............................................................................. 2-34
2.15.2 Enabling Extended Squitter Transmissions ....................................... 2-34
2.15.3 Assigning a Flight ID ....................................................................... 2-34
2.16 XPDR Modes ......................................................................................... 2-35
2.17 Squawk Code Keys ............................................................................... 2-36
2.17.1 VFR ................................................................................................ 2-36
2.17.2 XPDR Key ....................................................................................... 2-36
2.18 Remote Control .................................................................................... 2-38
2.19 XPDR Alert ............................................................................................ 2-38
ADS-B Altitude Reporting .............................................................................................................2-39
2.20 ADS-B Control Panel ............................................................................. 2-39
2.20.1 ADS-B Key ...................................................................................... 2-40
2.20.2 Enabling Anonymous Mode ........................................................... 2-40
2.20.3 Assigning a Flight ID ....................................................................... 2-41
2.21 GDL 88 Alert ......................................................................................... 2-41
Pilot Settings ........................................................................................................................................2-42
2.22 CDI Scale .............................................................................................. 2-42
2.22.1 Horizontal Alarm Limits .................................................................. 2-43
2.22.2 CDI On Screen ................................................................................ 2-44
2.23 Airport Runway Criteria ........................................................................ 2-45
2.23.1 Runway Surface ............................................................................. 2-45
2.23.2 Minimum Runway Length .............................................................. 2-45
2.24 Clocks & Timers .................................................................................... 2-46
2.24.1 Timers ............................................................................................ 2-46
2.24.2 Clock ............................................................................................. 2-46
2.25 Page Shortcuts ...................................................................................... 2-47
2.26 Alerts Settings ....................................................................................... 2-48
2.27 Unit Selections ...................................................................................... 2-49
2.28 Display Brightness Control .................................................................... 2-50
2.28.1 Automatic Brightness Control ......................................................... 2-50
2.28.2 Manual Brightness Control ............................................................. 2-50
2.29 Scheduled Messages ............................................................................ 2-51
2.29.1 Message Types ............................................................................... 2-51
2.29.2 Modifying Scheduled Messages ...................................................... 2-51
Status Indications ..............................................................................................................................2-52
2.30 Alert Types ............................................................................................ 2-52

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2.30.1 Alert Annunciations ........................................................................ 2-53

2.30.2 Pop-up Alerts ................................................................................. 2-54
2.30.3 Aural Alerts .................................................................................... 2-54
2.31 System Status ....................................................................................... 2-55
2.32 GPS Status ............................................................................................ 2-55
2.32.1 Circle of Uncertainty ....................................................................... 2-57
2.32.2 SBAS Providers ............................................................................... 2-58
2.32.3 GPS Status Annunciations .............................................................. 2-58
2.32.4 GPS Alerts ...................................................................................... 2-59
2.33 ADS-B Status ........................................................................................ 2-60
Logs ...........................................................................................................................................................2-62
2.34 Export to SD Card ................................................................................ 2-62
3 NAVIGATION ......................................................................................................................... 3-1
Map ..............................................................................................................................................................3-3
3.1 Map Setup ................................................................................................ 3-6
3.1.1 Configure User Fields ......................................................................... 3-7
3.1.2 Map Orientation ................................................................................. 3-9
3.1.3 North Up Above ................................................................................. 3-9
3.1.4 Visual Approach ............................................................................... 3-10
3.1.5 TOPO Scale ...................................................................................... 3-10
3.1.6 Range Ring ....................................................................................... 3-10
3.1.7 Track Vector ..................................................................................... 3-11
3.1.8 Ahead View ..................................................................................... 3-11
3.1.9 Map Detail ....................................................................................... 3-12
3.2 Map Interactions ..................................................................................... 3-14
3.2.1 Basic Interactions .............................................................................. 3-14
3.2.2 Graphical Flight Plan Editing ............................................................. 3-16
3.3 Map Overlays .......................................................................................... 3-20
3.3.1 Overlay Controls ............................................................................... 3-20
3.3.2 Overlay Status Icons ......................................................................... 3-23
3.3.3 Smart Airspace ................................................................................. 3-24
3.3.4 SafeTaxi ........................................................................................... 3-25
Active Flight Plan ..............................................................................................................................3-27
3.4 Collapse All Airways ................................................................................ 3-30
3.5 OBS ........................................................................................................ 3-30
3.6 Dead Reckoning ...................................................................................... 3-32
3.7 Parallel Track ........................................................................................... 3-33
3.8 Edit Data Fields ....................................................................................... 3-35
3.9 Flight Plan Catalog .................................................................................. 3-35
3.9.1 Catalog Route Options ..................................................................... 3-36
3.10 Create a Flight Plan ............................................................................... 3-38
3.10.1 Flight Plan Waypoint Options ......................................................... 3-39
3.11 Flight Plan Map Overlays ....................................................................... 3-40
3.11.1 Leg Status Indications ..................................................................... 3-40
3.11.2 Flight Plan User Field ...................................................................... 3-41
3.12 GPS NAV Status Key ............................................................................. 3-42
Direct To .................................................................................................................................................3-43
3.13 Direct To Basics ..................................................................................... 3-43
3.13.1 Direct To Search Tabs ..................................................................... 3-43

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3.13.2 Direct To Activation ........................................................................ 3-45

3.13.3 Navigating Direct To ....................................................................... 3-46
3.13.4 Removing a Direct-to Course .......................................................... 3-47
3.13.5 User Holds ...................................................................................... 3-48
Waypoints ..............................................................................................................................................3-49
3.14 Waypoint Information ........................................................................... 3-49
3.15 Waypoint Selection ............................................................................... 3-52
3.15.1 Waypoint Autofill ........................................................................... 3-52
3.15.2 Search Tabs .................................................................................... 3-53
3.16 Create User Waypoints ......................................................................... 3-55
3.16.1 Define Waypoint Criteria ................................................................ 3-56
3.16.2 Edit an Existing User Waypoint ....................................................... 3-58
3.16.3 Import User Waypoints ................................................................... 3-59
3.17 Nearest ................................................................................................. 3-61
Procedures ............................................................................................................................................3-63
3.18 Flight Procedure Basics .......................................................................... 3-64
3.18.1 GPS Flight Phase Annunciations ...................................................... 3-66
3.19 Departures ............................................................................................ 3-68
3.19.1 Flight Plan Departure Options ......................................................... 3-69
3.20 Arrivals ................................................................................................. 3-70
3.20.1 Flight Plan Arrival Options .............................................................. 3-71
3.21 Approaches .......................................................................................... 3-72
3.21.1 Flight Plan Approach Options ......................................................... 3-74
3.21.2 Missed Approach ........................................................................... 3-75
3.21.3 Approach Hold ............................................................................... 3-76
3.21.4 DME Arc ........................................................................................ 3-78
3.21.5 RF Legs ........................................................................................... 3-79
3.21.6 Vectors to Final .............................................................................. 3-79
3.21.7 ILS Approach .................................................................................. 3-80
3.21.8 RNAV Approaches .......................................................................... 3-80
3.21.9 Visual Approach ............................................................................. 3-87
3.21.10 Autopilot Outputs ........................................................................ 3-89
4 PLANNING .............................................................................................................................. 4-1
Vertical Calculator ..............................................................................................................................4-3
4.1 VCALC Page ............................................................................................. 4-3
4.2 VCALC Setup ............................................................................................ 4-4
Fuel Planning ..........................................................................................................................................4-5
4.3 Fuel Planning Page .................................................................................... 4-5
4.3.1 Fuel Planning Modes .......................................................................... 4-5
4.3.2 Computing Fuel Statistics ................................................................... 4-7
DALT/TAS/Wind Calculator ............................................................................................................4-8
4.4 DALT/TAS/Wind Page ................................................................................ 4-8
4.4.1 Editing Input Data .............................................................................. 4-8
4.4.2 Computing DALT/TAS/Wind Statistics ............................................... 4-10
RAIM Prediction .................................................................................................................................4-11
4.5 RAIM Prediction Page .............................................................................. 4-11
4.5.1 Calculating RAIM Status ................................................................... 4-12
4.5.2 RAIM Status Indications .................................................................... 4-12
5 HAZARD AWARENESS ..................................................................................................... 5-1

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Weather Awareness ............................................................................................................................5-3

5.1 Data Transmission Limitations ................................................................... 5-3
5.1.1 Line of Sight Reception ....................................................................... 5-3
5.1.2 Per FAA TSO-C157b ........................................................................... 5-4
5.1.3 NOTAM 30-Day Limitation ................................................................. 5-4
5.2 FIS-B Weather Display ............................................................................... 5-5
5.3 FIS-B Weather Setup ................................................................................. 5-6
5.4 FIS-B Weather Interactions ........................................................................ 5-7
5.5 FIS-B Weather Products ............................................................................. 5-8
5.5.1 Product Status .................................................................................... 5-8
5.5.2 Product Age ....................................................................................... 5-9
5.5.3 FIS-B NEXRAD .................................................................................. 5-10
5.5.4 METARs and TAFs ............................................................................ 5-12
5.5.5 AIRMETs ........................................................................................... 5-13
5.5.6 SIGMETs ........................................................................................... 5-14
5.5.7 PIREPs .............................................................................................. 5-14
5.5.8 Winds/Temps Aloft ........................................................................... 5-15
5.5.9 TFRs ................................................................................................. 5-15
5.6 Raw Text Reports .................................................................................... 5-16
5.7 FIS-B Ground Reception Status ................................................................ 5-18
Traffic Awareness .............................................................................................................................5-19
5.8 Traffic Applications ................................................................................. 5-19
5.8.1 Traffic Application Failures ................................................................ 5-20
5.9 Traffic Display ......................................................................................... 5-21
5.10 Traffic Setup ......................................................................................... 5-25
5.10.1 Motion Vectors .............................................................................. 5-26
5.10.2 Altitude Filtering ............................................................................. 5-26
5.11 Traffic Interactions ................................................................................ 5-27
5.12 Traffic Annunciations ............................................................................ 5-28
5.13 Traffic Alerting ...................................................................................... 5-29
Terrain Awareness ............................................................................................................................5-31
5.14 Terrain Configurations .......................................................................... 5-31
5.14.1 GPS Altitude for Terrain .................................................................. 5-32
5.15 Database Limitations ............................................................................. 5-33
5.16 Terrain Display ...................................................................................... 5-34
5.17 Terrain Setup ........................................................................................ 5-35
5.18 Terrain Proximity ................................................................................... 5-36
5.18.1 Terrain Elevation Depictions ............................................................ 5-36
5.18.2 Obstacle Elevation Depictions ......................................................... 5-37
5.19 Terrain Alerting ..................................................................................... 5-39
5.19.1 Alert Types ..................................................................................... 5-39
5.19.2 Alerting Thresholds ........................................................................ 5-40
5.19.3 Inhibiting FLTA & PDA Alerts .......................................................... 5-41
5.19.4 FLTA & PDA Alerts .......................................................................... 5-42
6 MESSAGES .............................................................................................................................. 6-1
Advisory Messages ..............................................................................................................................6-2
6.1 Message Key ............................................................................................. 6-2
6.2 Airspace Advisories ................................................................................... 6-2
6.3 Database Advisories .................................................................................. 6-3

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6.4 Flight Plan Advisories ................................................................................ 6-4

6.5 GPS/WAAS Advisories ............................................................................... 6-6
6.6 Navigation Advisories ................................................................................ 6-8
6.7 Pilot Specified Advisories ........................................................................... 6-9
6.8 System Hardware Advisories ................................................................... 6-10
6.8.1 COM Radio Advisories, GNC 355 ..................................................... 6-14
6.9 Terrain Advisories .................................................................................... 6-15
6.10 Traffic System Advisories ....................................................................... 6-16
6.10.1 Traffic Advisories, GPS 175 & GNC 355 .......................................... 6-16
6.10.2 Traffic Advisories, GNX 375 ............................................................ 6-18
6.11 VCALC Advisories ................................................................................. 6-19
6.12 Waypoint Advisories ............................................................................. 6-19
7 QUALIFICATION .................................................................................................................. 7-1
7.1 Glove Qualification ................................................................................... 7-1
8 GLOSSARY ............................................................................................................................... 8-1
9 COMPLIANCE ........................................................................................................................ 9-1

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 Warnings, Cautions, and Notes

WARNING
DO NOT USE TERRAIN AVOIDANCE DISPLAYS AS THE SOLE SOURCE OF INFORMATION
FOR MAINTAINING SEPARATION FROM TERRAIN AND OBSTACLES. GARMIN OBTAINS
TERRAIN AND OBSTACLE DATA FROM THIRD PARTY SOURCES AND CANNOT
INDEPENDENTLY VERIFY THE ACCURACY OF THE INFORMATION.

WARNING
DO NOT RELY SOLELY UPON TERRAIN PROXIMITY DATA FOR TERRAIN AVOIDANCE.
TERRAIN PROXIMITY IS NOT A CERTIFIED TERRAIN AWARENESS SYSTEM. IT IS AN AID
TO SITUATIONAL AWARENESS ONLY. USING TERRAIN PROXIMITY DATA DOES NOT
UNDER ANY CIRCUMSTANCES OR CONDITIONS RELIEVE THE PILOT’S RESPONSIBILITY
TO SEE AND AVOID TERRAIN OR OBSTACLES.

WARNING
ALWAYS REFER TO CURRENT AERONAUTICAL CHARTS AND NOTAMS FOR
VERIFICATION OF DISPLAYED AERONAUTICAL INFORMATION. DISPLAYED
AERONAUTICAL DATA MAY NOT INCORPORATE THE LATEST NOTAM INFORMATION.

WARNING
NEVER USE GPS ALTITUDE FOR VERTICAL NAVIGATION. THE ALTITUDE CALCULATED
BY GPS RECEIVERS IS GEOMETRIC HEIGHT ABOVE MEAN SEA LEVEL AND COULD VARY
SIGNIFICANTLY FROM THE ALTITUDE DISPLAYED BY PRESSURE ALTIMETERS (E.G., THE
OUTPUT FROM THE GDC 74A/B AIR DATA COMPUTER) OR OTHER ALTIMETERS IN THE
AIRCRAFT. ALWAYS REFER TO THE PRESSURE ALTIMETERS IN THE AIRCRAFT FOR
CURRENT PRESSURE ALTITUDE.

WARNING
NEVER USE EXPIRED DATABASES. UPDATE DATABASES REGULARLY TO ENSURE
CURRENCY. USE OUT OF DATE DATABASE INFORMATION AT YOUR OWN RISK.

WARNING
NEVER USE BASEMAP INFORMATION (LAND AND WATER DATA) AS THE SOLE MEANS
OF NAVIGATION. BASEMAP DATA IS INTENDED ONLY TO SUPPLEMENT OTHER
APPROVED NAVIGATION DATA SOURCES AND SHOULD BE CONSIDERED ONLY AN AID
TO ENHANCE SITUATIONAL AWARENESS.

WARNING
DO NOT RELY SOLELY UPON THE DISPLAY OF TRAFFIC INFORMATION TO
ACCURATELY DEPICT ALL OF THE TRAFFIC WITHIN RANGE OF THE AIRCRAFT. DUE TO
LACK OF EQUIPMENT, POOR SIGNAL RECEPTION, AND/OR INACCURATE
INFORMATION FROM AIRCRAFT OR GROUND STATIONS, TRAFFIC MAY BE PRESENT
THAT IS NOT REPRESENTED ON THE DISPLAY.

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Warnings, Cautions, and Notes

WARNING
NEVER USE DATALINK WEATHER INFORMATION FOR MANEUVERING IN, NEAR, OR
AROUND AREAS OF HAZARDOUS WEATHER. INFORMATION CONTAINED WITHIN
DATALINK WEATHER PRODUCTS MAY NOT ACCURATELY DEPICT CURRENT WEATHER
CONDITIONS.

WARNING
DO NOT USE THE INDICATED DATALINK WEATHER PRODUCT AGE TO DETERMINE
THE AGE OF THE WEATHER INFORMATION SHOWN BY THE DATALINK WEATHER
PRODUCT. DUE TO TIME DELAYS INHERENT IN GATHERING AND PROCESSING
WEATHER DATA FOR DATALINK TRANSMISSION, THE WEATHER INFORMATION
SHOWN BY THE DATALINK WEATHER PRODUCT MAY BE OLDER THAN THE
INDICATED WEATHER PRODUCT AGE.

WARNING
DO NOT RELY SOLELY UPON DATALINK SERVICES TO PROVIDE TFR INFORMATION.
ALWAYS CONFIRM TFR INFORMATION THROUGH OFFICIAL SOURCES SUCH AS
FLIGHT SERVICE STATIONS OR AIR TRAFFIC CONTROL.

WARNING
ALWAYS REFER TO CURRENT AERONAUTICAL CHARTS FOR APPROPRIATE MINIMUM
CLEARANCE ALTITUDES. THE DISPLAYED MSAs ARE ONLY ADVISORY IN NATURE AND
SHOULD NOT BE RELIED UPON AS THE SOLE SOURCE OF OBSTACLE AND TERRAIN
AVOIDANCE INFORMATION.

WARNING
DO NOT USE GPS TO NAVIGATE TO ANY ACTIVE WAYPOINT IDENTIFIED AS A “NON
WGS84 WPT” BY A SYSTEM MESSAGE. “NON WGS84 WPT” WAYPOINTS ARE DERIVED
FROM AN UNKNOWN MAP REFERENCE DATUM THAT MAY BE INCOMPATIBLE WITH
THE MAP REFERENCE DATUM USED BY GPS (KNOWN AS WGS84) AND MAY BE
POSITIONED IN ERROR AS DISPLAYED.

WARNING
DO NOT RELY SOLELY UPON THE DISPLAY OF TRAFFIC INFORMATION FOR COLLISION
AVOIDANCE MANEUVERING. THE TRAFFIC DISPLAY DOES NOT PROVIDE COLLISION
AVOIDANCE RESOLUTION ADVISORIES AND DOES NOT UNDER ANY CIRCUMSTANCES
OR CONDITIONS RELIEVE THE PILOT’S RESPONSIBILITY TO SEE AND AVOID OTHER
AIRCRAFT.

viii Pilot’s Guide 190-02488-01 Rev. A

 Warnings, Cautions, and Notes

WARNING
DO NOT RELY ON THE ACCURACY OF ATTITUDE AND HEADING INDICATIONS IN
GEOGRAPHIC AREAS WHERE VARIATION IN THE EARTH’S MAGNETIC FIELD EXISTS.
THIS INCLUDES: NORTH OF 72° NORTH LATITUDE AT ALL LONGITUDES; SOUTH OF 70°
SOUTH LATITUDE AT ALL LONGITUDES; NORTH OF 65° NORTH LATITUDE BETWEEN
LONGITUDE 75° W. AND 120° W. (NORTHERN CANADA); NORTH OF 70° NORTH
LATITUDE BETWEEN LONGITUDE 70° W. AND 128° W. (NORTHERN CANADA); NORTH
OF 70° NORTH LATITUDE BETWEEN LONGITUDE 85° E. AND 114° E. (NORTHERN
RUSSIA); SOUTH OF 55° SOUTH LATITUDE BETWEEN LONGITUDE 120° E. AND 165° E.
(REGION SOUTH OF AUSTRALIA AND NEW ZEALAND).

WARNING
DO NOT LEARN OPERATIONAL PROCEDURES IN THE AIR. FOR SAFETY REASONS,
THOROUGHLY PRACTICE BASIC OPERATION ON THE GROUND BEFORE ACTUAL USE.

WARNING
REVIEW AND UNDERSTAND ALL ASPECTS OF THIS PILOT’S GUIDE. DOING SO REDUCES
THE RISK OF UNSAFE OPERATION.

WARNING
ALWAYS RESOLVE ANY DISCREPANCIES BETWEEN THE DISPLAY AND OTHER
NAVIGATION SOURCES WHEN THEY OCCUR. DURING FLIGHT OPERATIONS,
COMPARE DISPLAY INDICATIONS TO INFORMATION FROM OTHER NAVAIDS, VISUAL
SIGHTINGS, CHARTS, AND OTHER AVAILABLE SOURCES BEFORE CONTINUING
NAVIGATION.

CAUTION
DO NOT CLEAN DISPLAY SURFACES WITH ABRASIVE CLOTHS OR CLEANERS
CONTAINING AMMONIA. THEY WILL HARM THE ANTI-REFLECTIVE COATING.

CAUTION
ENSURE THAT ANY UNIT REPAIRS ARE MADE BY AN AUTHORIZED GARMIN
SERVICE CENTER. UNAUTHORIZED REPAIRS OR MODIFICATIONS COULD VOID
BOTH THE WARRANTY AND AFFECT THE AIRWORTHINESS OF THE AIRCRAFT.

190-02488-01 Rev. A Pilot’s Guide ix

Warnings, Cautions, and Notes

NOTE
The application supports channel tuning for both 8.33 kHz and 25 kHz
channels within radio-frequency range. If flying in a region where 8.33 kHz
channel spacing is available, set the COM radio to 8.33 kHz to prevent the
loss of any stored or recently used frequencies.

NOTE
All visual depictions contained within this document, including screen images
of the system panel and displays, are subject to change and may not reflect
the most current system and aviation databases. Depictions of equipment
may differ slightly from the actual equipment.

NOTE
The United States government operates the Global Positioning System and is
solely responsible for its accuracy and maintenance. The GPS system is
subject to changes which could affect the accuracy and performance of all
GPS equipment. Portions of the system utilize GPS as a precision electronic
NAVAID. Therefore, as with all NAVAIDs, information presented by the
system can be misused or misinterpreted and, therefore, become unsafe.

NOTE
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.

NOTE
Interference from GPS repeaters operating inside nearby hangars can cause
an intermittent loss of attitude and heading displays while the aircraft is on
the ground. Moving the aircraft more than 100 yards away from the source
of the interference should alleviate the condition.

NOTE
Use of polarized eye wear may cause the flight displays to appear dim or
blank.

NOTE
This product, its packaging, and its components contain chemicals known to
the State of California to cause cancer, birth defects, or reproductive harm.
This notice is being provided in accordance with California’s Proposition 65.
If you have any questions or would like additional information, please refer
to our website at www.garmin.com/prop65.

x Pilot’s Guide 190-02488-01 Rev. A

 Warnings, Cautions, and Notes

NOTE
Operating the system in the vicinity of metal buildings, metal structures, or
electromagnetic fields can cause sensor differences that may result in
nuisance miscompare annunciations during start up, shut down, or while
taxiing. If one or more of the sensed values are unavailable, the annunciation
indicates no comparison is possible.

NOTE
The system responds to a terminal procedure based on data coded within
that procedure in the Navigation Database. Differences in system operation
may be observed among similar types of procedures due to differences in the
Navigation Database coding specific to each procedure.

NOTE
Do not use SafeTaxi functions as the basis for ground maneuvering. SafeTaxi
functions do not comply with the requirements of AC 120-76C and are not
qualified for use as an airport moving map display. SafeTaxi is to be used for
orientation purposes only.

NOTE
The FAA has asked Garmin to remind pilots who fly with Garmin
database-dependent avionics of the following:
• It is the pilot’s responsibility to remain familiar with all FAA regulatory and
advisory guidance and information related to the use of databases in the
National Airspace System.
• Garmin equipment will only recognize and use databases that are obtained
from Garmin or Jeppesen. Databases obtained from Garmin or Jeppesen that
have a Type 2 LOA from the FAA are assured compliance with all data quality
requirements (DQRs). A copy of the Type 2 LOA is available for each
applicable database and can be viewed at flyGarmin.com by selecting
“Aviation Database Declarations.”
• Use of a current Garmin or Jeppesen database in your Garmin equipment
is required for compliance with established FAA regulatory guidance, but
does not constitute authorization to fly any and all terminal procedures that
may be presented by the system. It is the pilot’s responsibility to operate in
accordance with established AFM(S) and regulatory guidance or limitations
as applicable to the pilot, the aircraft, and installed equipment.

NOTE
The pilot/operator must review and be familiar with Garmin’s database
exclusion list as discussed in SAIB CE-14-04 to determine what data may be
incomplete. The database exclusion list can be viewed at flyGarmin.com by
selecting “Aviation Database Declarations.”

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Warnings, Cautions, and Notes

NOTE
The pilot/operator must have access to Garmin and Jeppesen database alerts
and consider their impact on the intended aircraft operation. The database
alerts can be viewed at flyGarmin.com by selecting “Aviation Database
Alerts.”

NOTE
If the pilot/operator wants or needs to adjust the database, contact Garmin
Product Support.

NOTE
Garmin requests the flight crew report any observed discrepancies related to
database information. These discrepancies could come in the form of an
incorrect procedure; incorrectly identified terrain, obstacles and fixes; or any
other displayed item used for navigation or communication in the air or on
the ground. Visit flyGarmin.com and select “Aviation Data Error Report.”

NOTE
The navigation databases used in Garmin navigation systems contain Special
Procedures. Prior to flying these procedures, pilots must have specific FAA
authorization, training, and possession of the corresponding current, and
legitimately-sourced chart (approach plate, etc.). Inclusion of the Special
Procedure in the navigation database DOES NOT imply specific FAA
authorization to fly the procedure.

xii Pilot’s Guide 190-02488-01 Rev. A

 About This Guide

Record of Revision

REVISION DATE CHANGE DESCRIPTION

1 06/05/19 Experimental Release.

A 07/03/19 Production Release.

Layout

SECTION TITLE The design and layout of this guide is

intended to provide clear, concise
1 System at a Glance sections written in the logical order
of a pilot’s flight instrument and
2 Get Started
systems scan.
3 Navigation

4 Planning

5 Hazard Awareness

6 Messages

7 Qualification

8 Glossary

9 Compliance

Electronic Document Features

Versions of this guide are saved in Adobe Acrobat and are available for download at:
garmin.com/manuals

Product Descriptions
This guide covers the operation of the following Garmin products.
• GPS 175 • GNC 355 • GNC 355A • GNX 375
When you see product names separated by a forward slash (e.g., GNC 355/355A
or GPS 175/GNX 375), it means that the information pertains to both products.
When you see a product name in bold (e.g., GNC 355A), it means that the
information pertains to that specific model only.

Unless otherwise stated, information pertaining to GNC 355 is also applicable

to GNC 355A.

190-02488-01 Rev. A Pilot’s Guide xiii

Reference Documentation

Reference Manuals

DOCUMENT P/N
GDL 88 ADS-B Transceiver Pilot’s Guide 190-01122-03

GTX 335/345 All-In-One ADS-B Transponder Pilot’s Guide 190-01499-00

Reference Websites

WEBSITE ADDRESS
Aviation Limited Warranty https://www.garmin.com/en-US/legal/aviation-limited-warranty

Go to http://www.flygarmin.com/support and select

Database Concierge
Database Management.

ADS-B Academy https://www.garmin.com/us/intheair/ads-b

Connext http://www.garmin.com/connext

FAA Regulatory and

https://rgl.faa.gov
Guidance Library

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 System at a Glance

1 System at a Glance
OVERVIEW
1.1 Display Layout .......................................................................................1-3
1.2 Unit Functions ......................................................................................1-4
PILOT INTERFACE
1.3 Unit Power ............................................................................................1-5
1.4 SD Card Slot ..........................................................................................1-6
1.5 Touchscreen ..........................................................................................1-7
1.6 Control Knobs .....................................................................................1-11
1.7 Color Conventions...............................................................................1-16
COMPATIBLE EQUIPMENT
1.8 Line Replaceable Units .........................................................................1-17

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Overview
GPS 175, GNC 355/355A, and GNX 375 are the first 2” by 6.25” panel mount
navigators to employ full color capacitive touchscreen technology.
GPS 175 is a TSO-C146e compliant GPS/WAAS navigator with en route, terminal,
and precision/non-precision approach capabilities.
GNC 355/355A combines the functionality of the GPS 175 with a TSO-C169a
compliant VHF radio communications transceiver. The GNC 355 supports 25 kHz
channel spacing, while the GNC 355A provides tuning for both
25 kHz and 8.33 khz channels.
GNX 375 combines the functionality of the GPS 175 with a TSO-C112e (Level 2els,
Class 1) compliant mode S transponder.
Each unit is compatible with Bluetooth® wireless technology, providing flight plan,
traffic, weather, and position data to an available portable electronic device. Each is
certified compatible with the FAA’s ADS-B Out 2020 mandate.

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 System at a Glance

1.1 Display Layout

2

3
1 4
5

Bezel
Includes the power key, mechanical knobs, photocell, and SD card slot.
1
Ledges provide hand stability when performing data entry and making
selections.

Touchscreen
2
Multi-touch color display provides controls for unit operation.

Photocell
3 Measures cockpit ambient light level to automatically adjust display
brightness for day and night.

SD Card Slot
Interface for loading database, exporting log files, and updating software.
4
Compatibility with Flight Stream 510 allows wireless database transfer from
the Garmin Pilot app via Database Concierge.

Power/Home Key
5
Powers the unit on or off and provides direct access to the Home page.

Inner & Outer Knobs

6 Multipurpose dual concentric knob allows data entry, list scrolling, map range
control, page navigation, and COM volume and frequency tuning. [1]

[1] COM is a function of GNC 355/355A only.

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System at a Glance

1.2 Unit Functions

GPS 175 GNC 355/355A GNX 375
NAVIGATOR NAVIGATOR W/VHF NAVIGATOR
COM TRANSCEIVER W/TRANSPONDER

• Moving Map • Moving Map • Moving Map

• Terrain • Terrain • Terrain
• Flight Plan • Flight Plan • Flight Plan
• Graphical Flight • Graphical Flight • Graphical Flight
Planning Planning Planning
• Waypoint Information • Waypoint Information • Waypoint Information
• Nearest • Nearest • Nearest
• FIS-B Weather Display • FIS-B Weather Display • FIS-B Weather
[1] [2] [1] [2] Receiver & Display [2]
• ADS-B In Traffic • ADS-B In Traffic • ADS-B In Traffic
Display [1] [2] Display [1] [2] Receiver & Display [2]
• Terrain Avoidance • VHF Radio Transceiver • ADS-B Out on 1090
• System Advisories • Terrain Avoidance MHz Extended
• Scheduled Messages • System Advisories Squitter

• Clock • Scheduled Messages • Terrain Avoidance

• CDI • Clock • System Advisories

• Internal GPS Receiver • CDI • Scheduled Messages

• Built-in Bluetooth • Internal GPS Receiver • Clock

Antenna • Built-in Bluetooth • CDI
• Database Concierge Antenna • Internal GPS Receiver
Access [4] • 8.33 kHz channel • Built-in Bluetooth
spacing [3] Antenna
• Database Concierge • Mode S Transponder
Access [4] • Database Concierge
Access [4]

[1] Requires external ADS-B In product.

[2] ADS-B In via 1090 MHz (traffic) and 978 MHz UAT (traffic and weather).
[3] For use during European operations. Available with GNC 355A only.
[4] Requires Wi-Fi connection via Flight Stream 510.

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 System at a Glance

Pilot Interface
1.3 Unit Power
The unit receives power directly from the aircraft’s electrical system. Upon power-up,
the bezel key backlight momentarily illuminates. System failure annunciations
typically disappear within the first 30 seconds after power-up.
The start-up screen presents the unit software versions, the name and status of all
installed databases, and the Database Updates page access key. These features are
available only at power up.
Tapping Continue advances to the Instrument Test page.

If an instrument remains flagged after one minute, check the status of the
associated LRU, then contact a Garmin dealer for support.

1.3.1 Instrument Test

To ensure safe operation, continuous built-in test features exercise the unit’s
processor, memory, external inputs, and outputs. The Instrument Test page displays
the results of all external equipment checks performed by the unit.

Review this list to ensure that all

CDI outputs and other displayed
data are correct for the
connected equipment.

1.3.2 Power Off

WARNING
NEVER ATTEMPT TO POWER OFF THE UNIT WHILE AIRBORNE UNLESS
OPERATIONAL PROCEDURES DICTATE.

Pushing and holding the Power key for

0.5 seconds initiates the power off sequence.
Shutdown occurs once the timer reaches zero.
Power off annunciation temporarily replaces
the knob function indicator.

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System at a Glance

1.4 SD Card Slot

NOTE
Do not remove or insert an SD card while in flight. Always verify the system
is powered off before inserting or removing an SD card.

FUNCTIONAL REQUIREMENTS
• SD card in the FAT32 format, with memory capacity between
8 GB and 32 GB
The navigator requires an SD card for the following tasks.
• Exporting data logs • Saving system configurations
• Capturing screen images • Enabling Flight Stream connectivity
• Upgrading software • Updating databases

INSERT AN SD CARD
When inserting an SD card:
1. Verify unit power is off and the slot is empty.
2. Hold card such that label faces left edge of display screen.
3. Ensure back edge of card is flush with display bezel after insertion.

EJECT AN SD CARD
1. Power off the unit.
2. Release the spring latch by pressing lightly on exposed edge of card.

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 System at a Glance

1.5 Touchscreen
GESTURES
Touching the screen briefly with a single finger.
TAP
Use this gesture for:
• Opening a page or menu
• Activating a command key or data entry field
• Displaying map feature information
• Selecting an option within an application
Certain momentary controls (e.g., directional arrow
TAP AND HOLD keys) provide a secondary tap and hold function.
Tap the key and hold your finger in place until the
desired action occurs.
Use this gesture for:
• Scrolling with arrow keys
• Increasing/decreasing values continuously
A smooth motion that involves touching an object,
SWIPE
then sliding your finger across the screen and lifting
up.
Use this gesture for:
• Accessing multiple panes (right or left swipes)
• Viewing and scrolling lists
• Panning across a map display
FLICK Swiping the screen in a quick upward or downward
motion. Information moves at a fast speed (faster than
if holding the arrow key), then slows to a stop.
Use this gesture for:
• Scrolling an item list

PINCH & STRETCH Touch any map with two fingers at the same time,
then bring the fingers close together (pinch) or spread
them apart (stretch). Just remember: stretch to zoom
in and pinch to zoom out.
Use this gesture for:
• Magnifying map features

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System at a Glance

1.5.1 Keys
COMMON COMMANDS
Open the system messages Cancel an active function
list. A flashing icon indicates without inputting data.
unread messages.

Open a context menu. Input a specified value.

Return to the previous Select the corresponding

page. item (e.g., database
update). A checkmark
confirms selection.

FUNCTION KEYS
Toggle keys turn a specific function on or off.
The current state of the function is indicated
below the key label.
On Off

APP ICONS
Tapping one of these icons opens the corresponding application. Some apps provide
additional icons for accessing functions on subpages (e.g., Utilities, System).

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 System at a Glance

1.5.2 Menus
Menus group related controls into an expandable pane, allowing access to multiple
functions on a single page. Depending on the number of available functions, a menu
may comprise more than one pane.

Multiple panes are accessible by

way of a left/right swipe or inner
knob turn.

Active Pane

An indicator at the bottom of the menu shows

which pane is active.

POP-UP MENUS

Pop-up menus open to the default

or previously selected value.

Underlying Page Hidden

Default or Current Setting

LISTS
Scrollable lists group control keys related to a single function (e.g., FIS-B Weather).
When scrolling, all keys in the list are inactive.

Toggle keys either enable or disable list items.

In some cases, Settings or Range keys provide
access to selectable setting options.

Scroll Bar

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System at a Glance

1.5.3 Tabs
Tabs group information into individual panes. Content includes scrolling lists, data
fields, function keys, or a combination of controls.
Tabs are located along the left and right sides of a pane.

Active
Tabs
Inactive
Tabs
Inactive
Tabs

1.5.4 Keypads
The navigator employs multiple keypad types to serve specific settings and functions.

NUMERIC
Numeric keypads
open on a single
pane.
Backspace and
Enter keys always
appear at the right
of the screen.

ALPHANUMERIC
Alphanumeric keypads comprise multiple keysets that are accessible by way of swipe
or key selection.

Selectable Keysets

An indicator shows which keyset is active.

Keys a through m are active by default.

Active Keyset

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 System at a Glance

1.6 Control Knobs

Inner and outer control knobs offer an alternative method for
selecting and modifying data without the use of touch keys.

Outer Inner

1.6.1 Knob Functions

GPS 175 & GNX 375

• Selecting a page shortcut
Outer Knob • Cursor placement and initial field/page selections
• Moving cursor forward or backward within data field

Inner Knob • Zooming, scrolling lists, and inputting data

(Turn) • Modifying individual characters in data entry field
• Entering current or specified numerical value
Inner Knob
• Toggling Map user fields on or off
(Push)
• Accessing the Direct To function from the Home page

GNC 355/355A
• Selecting a page shortcut
• Cursor placement and initial field/page selections
Outer Knob • Moving cursor forward or backward within data field
• Tuning major frequency digits
• Adjusting COM radio volume (coarse)
• Zooming, scrolling lists, and inputting data
Inner Knob • Modifying individual characters in data entry field
(Turn) • Tuning minor frequency digits
• Adjusting COM radio volume (fine)
• Entering current or specified numerical value
Inner Knob
• Enabling standby frequency tuning mode from most pages
(Push)
• Enabling COM radio volume control (push twice)

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System at a Glance

1.6.2 Page Navigation Labels

A locater bar works in conjunction with the outer knob, providing quick access to the
indicated page. Turning the outer knob clockwise or counter-clockwise moves the
locater through the available shortcut options.

Slot 1 Slot 3 Active Page

Slot 2

Slot 1 is a dedicated Map shortcut. A cyan background and border

Slots 2 and 3 are customizable. indicate active page and available
Selectable page options are shortcuts.
dependent upon configuration.

1.6.3 Knob Function Indicators

Icons to the right of the bar indicate available knob functions. Indications include,
but are not limited to, the following.

GPS 175 & GNX 375

Map Active Flight Plan Active

Available functions: Available functions:

• Map zoom • Flight plan scrolling
• Toggle user fields on or off

Home Page Active Direct To Window Active

Available functions: Available functions:

• Page shortcut navigation • Direct-to waypoint editing
• Access Direct To window • Activate direct-to course

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 System at a Glance

GNC 355/GNC355A
Knob focus defaults to page navigation when not in use.

Map Active Flight Plan Active

Available functions: Available functions:

• Map zoom • Flight plan scrolling
• Set knob focus to standby • Set knob focus to standby
frequency frequency

STBY Frequency Tuning Active COM Volume Page Active

(via Knob Push) (via VOL Key)

Available functions: Available functions:

• Frequency tuning • Volume adjustment
• Activate volume control

1.6.4 Knob Shortcuts

For convenience, the unit allows you to access certain controls quickly via knob push.

GPS 175/GNX 375

From the Home page:

Pushing once opens the Direct To window. After a waypoint/fix

is selected, pushing the knob again activates the direct-to fix.

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System at a Glance

GNC 355/355A
From most pages:

Pushing once enables standby frequency tuning mode and

opens the COM volume controls. Turn the inner and outer knobs
to tune the standby frequency.

Pushing twice sets the knob focus to the volume slider. Turn the
inner and outer knobs to adjust the volume percentage.

Pushing again closes the menu and returns to the previous view.

A cyan border indicates changes in knob focus. This is useful when transitioning
through the different control modes: page navigation > STBY frequency tuning >
COM radio volume adjustment > page navigation

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 System at a Glance

1.6.5 Screen Captures

FUNCTIONAL REQUIREMENTS
• SD card in the FAT32 format, with memory capacity between
8 GB and 32 GB
FUNCTIONAL LIMITATIONS
• Not available with Flight Stream 510
Save images to an SD card at any time using a screen capture. Images automatically
save to the “print” folder in the SD card root directory.

1. Insert an SD card into the card slot.

2. Push and hold the control knob.
3. With knob depressed, push and release the Home/Power key.

A camera icon momentarily shows in the annunciator bar indicating a successful

screen capture.
To view saved images, remove the SD card and open the “print” folder on a
computer.

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System at a Glance

1.7 Color Conventions

Red
• Warning conditions

Yellow
• Cautionary conditions

Green
• Safe operating conditions
• Engaged modes
• Active COM frequency
White
• Scales and markings
• Current data and values
• Heading legs
Magenta
• GPS data
• Active flight plan legs
• Parallel track
Cyan
• Pilot-selectable references
• Standby COM frequency
Gray
• Missing or expired data
• Product unavailable
Blue
• Water

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 System at a Glance

Compatible Equipment
1.8 Line Replaceable Units

SYSTEM REQUIRED LRUS The system consists of multiple LRUs,

GPS antenna which are installed behind the
instrument panel or in a separate
SYSTEM OPTIONAL LRUS avionics bay. Their modular design
ADAHRS or ADC with AHRS aids system maintenance and unit
replacement.
Audio panel
Optional LRUs may include
GAD 29 adapter compatible equipment from either
GAE 12 altitude encoder Garmin or a third party manufacturer.
(GNX 375 only)
G3X Touch
G500/G600
G500/G600 TXi
GMX 200
MX 20
OPTIONAL INTERFACES
GDL 88/GTX 345 ADS-B transceiver
(GPS 175 & GNC 355 only)

1.8.1 ADC & AHRS

AHRS units have a magnetometer interface for determining magnetic heading. ADC
units have a Pitot-static interface for measuring pressure altitude.

LRU DISPLAY FUNCTION

GDC 74 • Air temperature
GNX
ADC • Pressure Altitude
GPS ADC
G3X
GNC • Air temperature
G500/G600 GNX • Pressure Altitude
GSU 25/73 AHRS
GNX
Integrated ADAHRS • Heading
GRS 77
GNX • Heading
AHRS

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System at a Glance

1.8.2 Altitude Encoder

LRU DISPLAY FUNCTION

GAE 12
Provides pressure altitude GNX Aircraft static pressure
information to the
transponder.

1.8.3 ADS-B In Data

LRU DISPLAY FUNCTION

Traffic Services
• ADS-B
• TIS-B
Weather Services
• FIS-B
Weather Products
Map & FIS-B Weather:
GDL 88 • Precip
GTX 345 GPS • METARs
Provides datalink traffic GNC
• TFRs
and weather.
FIS-B Weather only:
• Precip
• Winds Aloft
• METARs/TAFs
• AIRMETs
• SIGMETs
• PIREPs

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 Get Started

2 Get Started
DATABASES
2.1 Database Effective Cycles.......................................................................2-3
2.2 Active and Standby Databases ...............................................................2-4
2.3 Manual Updates ....................................................................................2-5
2.4 Automatic Updates................................................................................2-8
2.5 Database Concierge ..............................................................................2-9
CONNECTIVITY
2.6 Connext Setup ....................................................................................2-12
2.7 Bluetooth Setup ..................................................................................2-13
COM
2.8 COM Standby Control Panel ................................................................2-15
2.9 COM Radio Setup................................................................................2-18
2.10 Tuning & Monitoring ...........................................................................2-22
2.11 Frequency Selection .............................................................................2-27
2.12 Create User Frequencies ......................................................................2-30
2.13 COM Alert...........................................................................................2-32
XPDR
2.14 XPDR Control Panel .............................................................................2-33
2.15 XPDR Setup .........................................................................................2-34
2.16 XPDR Modes .......................................................................................2-35
2.17 Squawk Code Keys ..............................................................................2-36
2.18 Remote Control ...................................................................................2-38
2.19 XPDR Alert ..........................................................................................2-38
ADS-B ALTITUDE REPORTING
2.20 ADS-B Control Panel............................................................................2-39
2.21 GDL 88 Alert .......................................................................................2-41
PILOT SETTINGS
2.22 CDI Scale .............................................................................................2-42
2.23 Airport Runway Criteria .......................................................................2-45
2.24 Clocks & Timers ...................................................................................2-46
2.25 Page Shortcuts ....................................................................................2-47
2.26 Alerts Settings .....................................................................................2-48
2.27 Unit Selections.....................................................................................2-49
2.28 Display Brightness Control ...................................................................2-50
2.29 Scheduled Messages ...........................................................................2-51
STATUS INDICATIONS
2.30 Alert Types ..........................................................................................2-52
2.31 System Status ......................................................................................2-55
2.32 GPS Status...........................................................................................2-55
2.33 ADS-B Status .......................................................................................2-60
LOGS
2.34 Export to SD Card ...............................................................................2-62

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Get Started

Databases
NOTE
The navigator supports SD cards in the FAT32 format only, with capacities
ranging between 8 GB and 32 GB.

Databases are stored in the unit’s internal memory. To view update cycles, or to
purchase individual databases or database packages, go to flyGarmin.com.
There are two methods for loading and updating databases. Do not attempt either
of these while in flight (on ground only).
• Load databases via SD card. Once loading completes, you may power off
the unit and remove the card.
• Transfer databases from a Flight Stream 510 wireless datacard. This
method requires the Garmin Pilot app on a portable electronic device.

SUPPORTED DATABASES
Bodies of water, geopolitical boundary, and road
Basemap
information
Airport, NAVAID, waypoint, and airspace information
Navigation
(Garmin or Jeppesen)
Obstacles Obstacle and wire data
SafeTaxi Airport surface diagrams
Terrain Terrain elevation data

For information regarding third party navigation databases, go to jeppesen.com.

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 Get Started

2.1 Database Effective Cycles

Most databases expire at regular intervals. Exceptions include Basemap and Terrain,
which neither expire nor update on a regular schedule.

The start-up page lists all currently

installed databases. Review this list for
current database types, cycle numbers,
and expiration dates.

Yellow text denotes when a database is:

• Not available
• Installed before its effective date
• Missing date information
• Past its expiration date

DATABASE EFFECTIVE STATUS

• Effective upon release
• Transfer occurs prior to database verification at system
Databases with start-up
no effective
date • No automatic transfer if Flight Stream 510 is present
• Includes Basemap and Terrain
• No pilot confirmation or restart required
• Effective during a specific period
Databases with
• Unit determines database status using the current date
specified
and time from GPS
effective dates
• Automatic activation occurs on the effective date

DATABASE NOT FOUND

Notifications for databases not present or available also display in the form of system
messages.

Tapping Database Info

opens the Active Database
Information page.
Review this list to determine
the status of the indicated
database.

Database
Not Present

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Get Started

2.2 Active and Standby Databases

The navigator uses two types of databases: active and standby. Active databases are
in use by the system. Standby databases have not reached the effective date.

During normal operation,

information about all active
and standby databases are
viewable on the associated
info page.

From the Home page, tap System > System Status > Select Active or Standby.

DB INFO PAGE DISPLAYS

• Information about databases currently in use
Active
• View Copyrights key
Standby • Information about databases that are not yet effective

The Standby DB Info page notifies when

no standby databases are available.

VIEW COPYRIGHTS
Tapping this key displays copyright information for all
installed databases.

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 Get Started

2.3 Manual Updates

FUNCTIONAL LIMITATIONS
The Database Updates page is available only when:
• The aircraft is on ground
• The start-up page is active (i.e., during power up)

2.3.1 Database Updates Page

This page presents a list of all available databases.
To open, tap the Databases key on the start-up page.

1
2

DATABASE SOURCE INDICATION

Connext Icon

A Connext icon indicates when a

database is from Garmin Pilot via
wireless transfer.

No indication means the database is either from an SD card or the unit’s internal
standby queue.

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SELECT ALL DATABASES

Select individual databases for transfer, or choose Select All if all
listed databases require updating.

After all selections are made,

initiate the update process by
tapping Start.
By default, this page displays only
the databases recommended for
update.
Basemap and Terrain update automatically and
require no action.

A message notifies when no such

databases are available.

The unit automatically restarts

once all updates are complete.

SHOW ALL DATABASES

Tapping Show All displays a complete list of all databases.

This list may include databases

that are:
• Not yet effective
• Older than the currently
Error Older active database(s)
Icon Timestamp
• Unable to update due to
an error

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 Get Started

ERROR INFORMATION
To determine the cause of a database error, tap Error Info.

An information window provides

details regarding the state of the
database.

SELECT REGION
This key appears when two
databases are of the same type
and cycle, but pertain to different
regions.
To specify a database region, tap
Select Region, then select the
appropriate menu option.

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2.4 Automatic Updates

When a newer database is available,
Automatic updates occur follow the on-screen prompts to
when: complete the update process.
• A newer database is A status page displays a progress bar
detected on the SD card or in and the name of each database as it
the internal standby queue uploads to the unit. Terrain databases
• A newer database is within may require up to 5 minutes for
its effective dates transfer. Total transfer time depends on
the SD card type.
• The aircraft is on ground

The unit automatically restarts once the update is complete. The update is indicated
in the list of currently installed databases.

INSTALL OR UPDATE A DATABASE USING AN SD CARD

1. Download a database onto an SD card.
2. Insert the SD card with the most recent database(s) into the card slot.
3. Power on the unit.

Selecting Update opens the DB Updates page,

where a list of the newest databases is
available for review.
All newer databases (effective and expired)
transfer from the SD card to the internal
standby queue.

BASEMAP AND TERRAIN UPDATES

These databases automatically transfer from an SD card without any prompting or
progress indications. They do not require pilot confirmation or a unit restart.

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 Get Started

2.5 Database Concierge

FEATURE REQUIREMENTS
• Flight Stream 510 wireless datacard
• Garmin Pilot app on a mobile device
• The aircraft is on ground

Database Concierge allows wireless transfer of databases

from a mobile device while the aircraft is on ground.
A pilot selects and downloads databases inside the
Garmin Pilot app. Transfers occur once Flight Stream 510
establishes a wireless connection inside the aircraft.

Database Concierge Transfer Function

• Provides automatic updates for databases with effective dates
• Preloads databases that are not yet effective by placing them in the internal
standby queue
• Displays database type, cycle, effective date, and transfer progress
• Allows manual operation via Start key
• Requires pilot confirmation

TRANSFER A DATABASE USING DATABASE CONCIERGE

1. Purchase database(s) from flyGarmin.com.
2. Open Garmin Pilot and follow the download instructions.
3. Install Flight Stream 510 and then power on unit.
4. Connect to Wi-Fi.
5. Follow the on screen prompts.

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Database Concierge transfers

databases from the app to
Flight Stream 510.
A progress bar shows when this
process is complete.

Database Transfer Status

The unit either updates or

preloads databases based on
their effective date. A second
progress bar indicates upload
status. The unit automatically
Database Update Status restarts upon database activation.

Tapping Skip cancels any unfinished wireless transfers and

initiates the update process.

The unit activates any databases that completed transfer before the interruption.
Previously selected databases on an SD card or in the internal standby update as well.
The message “Transfers interrupted” displays if no databases are available.

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2.5.1 Wi-Fi Setup

Tapping WiFi Info opens an information page. This page is
accessible from the Database Update and start-up pages.

Information includes:
• Database Concierge
connection status
• Connected device name
• Database update availability
and instructions
• Wi-Fi SSID and password

WI-FI INFO KEY STATUS ANNUNCIATIONS

Wi-Fi connection status annunciates on the key label when the information page is
not active.

Flight Stream 510 requires power up.

Wi-Fi is active, but the unit is waiting to connect with a

device.
Connection complete. Flight Stream 510 requires Garmin
Pilot to be opened in order for database transfer to
commence.
Garmin Pilot opened and streaming to unit.

CONNECT TO WI-FI
Follow the onscreen prompts when connecting to the Wi-Fi network.
1. Install Flight Stream 510 and then power on unit. Observe Wi-Fi status changes
from “Offline” to “Ready.”
2. Tap WiFi Info.
3. Enter the required SSID and password using the provided keypads.
4. Enable Wi-Fi setting on the portable device. Wi-Fi status changes to
“Open App” once pairing is complete.

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Connectivity
Connext works via the Bluetooth data link to provide up-to-date,
wireless information throughout the cockpit.

FEATURE LIMITATIONS
• Unit allows pairing of up to 13 Bluetooth enabled devices, with two
simultaneous device connections
• Auto reconnect function is not available for Android devices

2.6 Connext Setup

The Connext interface allows communication
with Garmin Pilot from a portable electronic
device.

Connext Features
The following features are available on your portable electronic device.
• GPS position and velocity information
• Uncorrected barometric pressure altitude used by transponder and ADS-B [1]
• ADS-B In traffic data [2]
• FIS-B weather and flight information [2]
• AHRS data from built-in sensor [3] [4]
[1] GNX 375 only.
[2] GNX 375, or GPS 175 with external ADS-B In source.
[3] Attitude data does not output to other installed avionics.
[4] The internal AHRS sensor is only for use with a portable electronic device. All internal AHRS
functions are automatic and do not require pilot action.

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2.7 Bluetooth Setup

The unit supports wireless pairing with
Bluetooth Wireless up to 13 portable electronic devices via
Features the Garmin Pilot app.
• FIS-B weather [1] Bluetooth device management options
• ADS-B traffic [1] reside on the Devices page. Opening
• GPS/WAASposition,velocity, this page automatically initiates device
pairing.
and time
• Pressure altitude Device information and pairing mode
status display on the Connext page.
• AHRS
• Magnetic heading
• Flight plan transfer

[1] GNX 375, or GPS 175/GNC 355 with external ADS-B In source.

2.7.1 Enabling Bluetooth Functionality

Tapping Bluetooth Enabled
toggles Bluetooth wireless
functionality on or off.
All associated setting controls and
features are unavailable when this
function is inactive.

DEVICE NAME
This key allows you to enter the name of the Bluetooth
enabled device. Use the keypad or control knobs to
enter the device name.

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2.7.2 Managing Paired Devices

To view a list of all paired devices
and their connection status, tap
Paired Devices.
To enable automatic connection
between the unit and a paired
device at power up, tap
Auto Reconnect.

AUTO RECONNECT
Enables automatic connection between the unit and the paired device when the two
are within range.

REMOVE
Removing a device from the list means it is no longer paired with the unit. This action
requires pilot confirmation.
Be sure to remove pairing on both devices before attempting to pair them again.

CONNECTION STATUS
The device is configured and communicating properly.

The device is not available and is not configured or it is not

communicating properly.

2.7.3 Importing a Flight Plan

This feature allows automatic import of flight plans via
Bluetooth wireless technology.
It may be necessary to turn this function off if a portable
device application makes repeated erroneous attempts to
send flight plans to the unit.

Once transfer is complete, an

advisory message informs that a
new flight plan is available for
preview.
To view the flight plan,
acknowledge the advisory and
tap Preview.

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COM
AVAILABLE WITH:
GNC 355/355A

2.8 COM Standby Control Panel

VHF COM transceiver controls are
1 accessible via the selectable
standby (STBY) frequency window.
This control resides in the upper right
2 corner of the display.

4 3

1 Active Frequency Window 5 Transfer (Flip-Flop) Key

2 Standby Frequency Window 6 COM Volume Access Key

3 Frequency Entry Field 7 Data Entry Keys

4 Monitor Key

From the COM Standby

control panel you can:
• Specify a standby frequency
• Swap active and standby
frequency values
• Enable monitor mode
• Access radio volume controls

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2.8.1 COM Volume Controls

Percent of Relative Volume Adjust radio volume according to

Max Volume Indicator your preference. Directional keys
allow volume adjustments.
A cyan border indicates current
knob focus.
The unit retains volume settings
over power cycles.

Decrease Increase
Volume Volume
Knob Control
Indicator

Access volume controls by tapping the VOL indicator key on the

COM Standby control panel, or using the control knob as
described below.

For convenience, COM volume functions are accessible

from most pages via inner knob push.
• Pushing once opens the COM Volume controls menu.
• Pushing twice sets the knob focus to the volume
slider. Turn the inner and outer knobs to adjust the
volume percentage.
• Pushing again closes the menu and returns to the
previous view.

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OPEN SQUELCH
Tap once to override the automatic squelch function. Tap
again to return the squelch to automatic operation.

“SQ” annunciates in the COM active frequency window to

show when the squelch is overridden (i.e., when the
squelch is open).
The Open Squelch function is accessible from the
COM Volume page and slide-out menu.

The automatic squelch function rejects many localized noise sources. Overriding
this function may be helpful when listening to a distant station or setting the
volume level.

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2.9 COM Radio Setup

COM radio customization options reside in the
System Setup app.

Setup options for GNC 355A shown as typical.

For COM radio selections, swipe to
the end of the menu.

From here you can:

• Set transceiver channel spacing [1]
• Enable reverse frequency look-up
functionality
• Adjust sidetone volume offset

[1] GNC 355A only.

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2.9.1 Channel Spacing Option

AVAILABLE WITH: GNC 355A

The GNC 355A supports channel tuning for both 8.33 kHz and 25 kHz channels
within radio-frequency range. The GNC 355 supports frequency-channel pairings
for 25 kHz channels only.

Tapping this key toggles the transceiver channel spacing

between 8.33 kHz and 25.0 kHz.

8.33 kHz* 25.0 kHz

8.33 kHz step configuration is COM radio operates in the

available for European aviation voice band, between
operations. 118.000 and 136.975 MHz,
in 25.0 kHz steps.

*GNC 355A: Channel spacing is set to 8.33 kHz by default.

If flying in a region where 8.33 kHz channel spacing is available, set the COM
radio to 8.33 kHz to prevent the loss of any stored or recently used frequencies.

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2.9.2 Reverse Frequency Look-up

FEATURE REQUIREMENTS
• Valid position data
• Active navigation database
FEATURE LIMITATIONS
• Available only for the nearest stations in the database

Display the facility identifier and frequency type for

active and standby frequencies.
The unit verifies the displayed frequency against the
database at least once per minute.

Facility
Identifier

“+” denotes more than one type

associated with the frequency.

Frequency
Type

When frequency look-up

is active, COM displays:
• Nearest facility identifier
(if available)
• Multiple facility indication
When flying between airports that
(if more than one)
use the same frequency, it may take
• Frequency type up to 2 minutes for look-up
• Approach or Departure information to change after
indications (if applicable) crossing the half way point.

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2.9.3 Sidetone Volume Offset

FEATURE LIMITATIONS
• Availability dependent upon configuration
• Offset range: +/-10% of total COM audio volume range

Numeric Manual Offset If the unit is wired for audio

Offset Value Indicator output, set the sidetone volume
offset to the preferred level.
By default, the offset value is set
to zero.
The unit retains manual offset
Decrease Increase settings over power cycles.
Offset Offset

COM sidetone is audio spoken into the microphone that is played back in real
time over the headset. The offset setting determines sidetone volume for the
COM during radio transmission. Adjustments determine the amount that the
sidetone volume level is offset from the COM receiver volume or the configured
sidetone volume.

LINK TO COM VOLUME

Enabling this function allows you to adjust the
amount that the sidetone volume level is offset from
the COM receiver volume. These adjustments are
dynamic in that they vary with the COM receiver
volume level.

To adjust the offset from the COM receiver volume:

1. Enable Link to COM VOL.
2. Tap Offset and adjust as necessary.

To adjust the offset from the configured sidetone volume, disable Link to COM VOL
and then adjust the offset as necessary. These adjustments are fixed as they are
relative to the configured sidetone volume.

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2.10 Tuning & Monitoring

Communication frequencies are split
between two selectable windows:
Active
Frequency The upper window presents the active
COM radio frequency. This is the
frequency currently in use for transmit
Standby and receive operations.
Frequency
The lower window presents the standby
radio frequency. This frequency may be
set and activated at any time.

COM STATUS INDICATIONS

Status annunciations denote active functions, modes, and frequency types.

Receiving Automatic Squelch Transmitting

Transmission Overridden

Frequency Monitor
Lookup Mode
Result Active

Transmitting

Receiving transmission

Monitor mode active

Automatic squelch is overridden (i.e., squelch is open)

Reverse frequency information (sample text)

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2.10.1 Direct Tuning

You may enter a standby frequency using the data

entry keys on the COM Standby control panel or by
pressing and turning the control knob.
Tapping STBY opens the control panel. From here you
may specify a frequency or select one using the
provided search options.

The current standby frequency value displays in the

direct tuning field.

DATA ENTRY KEYS

Enter a new standby frequency

using the provided data entry
keys or by turning and pushing
the control knob.
To cancel the entry and exit
the control panel, tap Back.

Entering the new frequency value

places it in standby.

FREQUENCY AUTOFILL

Numeric characters autofill the first valid frequency

value based on each selected digit.
Autofill characters are muted and display from the
Matching cursor position to the right of the field.
Frequency

Selecting a digit that is not valid for the cursor location

results in no entry.

Invalid Selection

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Attempting to enter a frequency

value after selecting an invalid
digit generates a pop-up
message.
Confirm the request by
selecting OK.

Simplified Frequency Entry

The direct tuning field allows you
the option of entering frequencies
without typing the leading and/or
trailing digits. For example:
To enter frequency 121.50, you
need only tap 2, 1, and 5.
The field autofills the leading
“1” and trailing “0.”

KNOB TUNING
The control knob allows you to enter a standby frequency without opening the
control panel.

Pushing the control If no action occurs After 10 seconds,

knob once activates after 3 seconds, a the window returns
frequency entry cyan border appears to an inactive state.
mode. The STBY around the window.
window turns cyan This indicates that
to show it is active. the function will be
deselected in
10 seconds.

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2.10.2 Transfer Frequency to Active (Flip-Flop)

Before After
The transfer (or flip-flop)
function allows you to swap
the active and standby
frequency values.
This function is accessible
multiple ways.

COM ACTIVE FREQUENCY WINDOW

Tapping this window swaps the active frequency value with
the standby frequency displayed in the lower window.
Tap once to swap the displayed frequency values. Tap again
to swap them back.

A transfer icon indicates that flip-flop

functionality is available.

XFER KEY
Tapping this key on the COM Standby control panel performs the
same function as tapping the COM active frequency window.

CONTROL KNOB

Pushing and holding the control knob for 0.5 seconds

automatically flip-flops the active and standby frequency
values.
• “Hold for flip-flop” control label appears in the
annunciator bar
• Standby and active COM frequency values swap

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Frequency Autofill &

Transfer
If you initiate a transfer before
completing frequency entry, the
direct tuning field autofills the
remaining characters, enters the
frequency into the standby field,
and then swaps it with the active
frequency.

2.10.3 Monitor Mode

Enabling monitor mode allows you to listen to the standby
frequency while the unit continues monitoring the active COM
channel.
When the COM active frequency receives a signal, the unit
automatically switches back to the active frequency. Once activity
on the COM active channel ceases, the unit returns to listening
to the standby frequency.

Monitor mode is useful when

Tower Transmission you want to listen to a recorded
(Active Frequency)
broadcast (e.g., ATIS) on the
standby channel, but still receive
ATIS Broadcast control tower transmissions on
(Standby Frequency) the active channel.

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2.11 Frequency Selection

The unit provides multiple options for finding and selecting a standby frequency from
the available database frequencies.

2.11.1 Search Tabs

The Find key provides access to multiple search tabs.
Each tab displays a list of selectable identifiers based on specific criteria.

Nearest • Lists up to 25 airports within a 200 nm radius

Airports
Nearest FSS & • List the distance, bearing, and frequency associated with
ARTCC the specified facility name
Recent • Lists up to 20 of the most recently tuned frequencies
Flight Plan • Lists all frequencies contained in the active flight plan
User • Lists up to 15 user-defined frequencies

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TAB ENTRIES

Waypoint Bearing &

Identifier Distance
Each entry includes general
information about the
associated waypoint.

Frequency Key

MULTIPLE FREQUENCIES
This key appears when more than one frequency is
available at the indicated identifier.
Applicable to functions displaying information only
(Nearest Airports, FSS, and ARTCC).

Tap Multiple FREQ and

select a frequency from
associated pop-up.

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2.11.2 Remote Frequency Selection

FEATURE LIMITATIONS
• Availability dependent upon configuration
On units configured for remote frequency recall, user frequencies are selectable via a
remote switch.
• Pressing the switch once loads the next user frequency into the STBY window
• Pressing the switch repeatedly scrolls through the list of presets
• Some installations may have two dedicated recall switches: one to scroll up,
one to scroll down
• Selections do not activate until transfered to active

2.11.3 Emergency Frequency

This function provides a quick method for remotely tuning the emergency frequency
(121.50 MHz). This feature is available any time the unit is on, regardless of GPS or
display status.

Remote COM Lock

If configured, pressing and
holding the remote COM transfer
key for two seconds locks the If the radio loses communication
COM at 121.50 MHz, preventing with the system, the unit
further changes in frequency. A automatically tunes to 121.50 MHz
message informs of the change in for transmit and receive operations,
status. To unlock, press and hold regardless of the displayed
the remote key again. frequency.

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2.12 Create User Frequencies

FEATURE LIMITATIONS
• Names may be up to seven characters in length
• Maximum number of 15 user frequencies

Create or edit user frequencies from the

Edit Frequency pop-up menu.

Name Assign the frequency a unique identifier.

Frequency Specify a frequency value.
Save Add the frequency to the user frequency list.

Delete Remove the selected user frequency from the list.

Appears only for existing entries.

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ADD A USER FREQUENCY

From the COM Standby page:
1. Tap Find > Select the User tab.
2. Tap Add User Frequency.
3. Specify the frequency name and value.
4. Tap Save.

A pop-up message informs when

the user frequency list is full.

EDIT USER FREQUENCY

Tapping the Edit key for an existing
entry opens the same pop-up.
From here you may modify the user
frequency name and value.
Tapping Save stores all changes.
User Edit Key
Frequency

Tapping Delete removes the

selected user frequency from the
list. A pop-up message requests
confirmation.

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2.13 COM Alert

If the radio fails:
• Red “X” displays over the COM key
• Advisory message alerts
• COM control page is not available

COM radio fail annunciations are designed to be immediately recognizable.

If a failure occurs while the control page is active, the display automatically returns
to the previous page.

UNIT CONDITION
GNC 355
Invalid COM radio data.
GNC 355A

For information regarding pilot response to a COM radio failure, consult the
AFMS.

2.13.1 Stuck Microphone

The COM transmitter automatically times out after 30 seconds of continuous
broadcasting. This may occur when:
• Push-to-talk key on the microphone is stuck or accidentally left in the keyed
position
• Push-to-talk function continues to transmit after releasing the key
The advisory message “COM push-to-talk is stuck” alerts for as long as the condition
exists.

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XPDR
AVAILABLE WITH: GNX 375

2.14 XPDR Control Panel

Transponder controls are accessible via the XPDR key.
This key is unavailable when the control panel is active.

1 5

2
4

1 Squawk Code Entry Field 4 Squawk Code Entry Keys

2 VFR Key 5 Data Field

3 XPDR Mode Key

The XPDR key becomes

available when you:
• Enter a squawk code
• Open the XPDR menu
• View a message
• Select the Mode key
• Leave the control panel

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2.15 XPDR Setup

Tap Menu to access the transponder setup
options. From here you can:
• Change the display of data
• Enable 1090 ES ADS-B Out
functionality (if configured)
• Assign a unique flight ID

2.15.1 Displaying Data

Toggles the data field between pressure altitude and
flight ID.

Pressure Altitude Flight ID

Displays the current pressure Displays the active Flight ID.

altitude. Unless configured, the
Flight ID is not editable.

2.15.2 Enabling Extended Squitter Transmissions

Tapping ADS-B Out allows the transmission of ADS-B Out
messages and position information.

2.15.3 Assigning a Flight ID

FEATURE LIMITATIONS
• Availability dependent on configuration

If the flight ID is editable, tap Flight ID

and assign a unique identifier.

Flight IDs are alphanumeric (upper-case only) and have an eight character limit.
The active flight ID displays by default.

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2.16 XPDR Modes

Tapping Mode opens a menu of the available transponder
modes. Options include Standby, On, and Altitude Reporting.

MODE FUNCTION
• Transponder does not reply to interrogations or
transmit ADS-B Out
Standby • Bluetooth wireless functions remain operational
• Unit continues to receive ADS-B In information, but is
not a TIS-B participant
• Transponder replies to interrogations. Replies do not
include pressure altitude
• Reply (R) symbol on the display indicates the
On
transponder is responding
• Transmitted ADS-B Out does not include pressure
altitude
• Transponder replies to identification and altitude
interrogations
Altitude
• Reply (R) symbol indicates the transponder is
Reporting
responding
• Transmitted ADS-B Out includes pressure altitude

During Altitude Reporting mode, all aircraft air/ground state transmissions are
handled via the transponder and require no pilot action. Always use this mode
while in the air and on the ground, unless otherwise requested by ATC.

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2.17 Squawk Code Keys

SPECIAL SQUAWK CODES Eight squawk code entry keys (0 – 7)
1200 Default VFR code (USA) provide access to all ATCRBS codes.
Tapping one of these keys begins the
7500 Hijacking code selection sequence.
7600 Loss of communications Use the Backspace key or outer
7700 Emergency control knob to move the cursor.

Digits that are not yet entered appear as underscores.

Activate the new code by

tapping Enter.
To cancel the code entry and exit
the page, tap Cancel.

Active squawk codes remain in use until

a new code is entered.

2.17.1 VFR

Tapping this key once sets the squawk code to the

preprogrammed VFR code.
This code is factory set to 1200, but may be changed during
configuration.

2.17.2 XPDR Key

Active Transponder Tapping the XPDR key activates
Transponder Mode (On)
the IDENT function for 18 seconds.
This signal distinguishes the
transponder from others on the air
traffic controller’s screen.
Tapping this key when another
Active Squawk page is active immediately opens
Code
the control panel.

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TRANSPONDER STATUS INDICATIONS

IDENT Standby Mode

• Reply active • Standby mode

• IDENT function active • Current squawk code
• No change to (inactive)
transponder code

IDENT with New Squawk Code Altitude Reporting Mode

• Reply active • Altitude reporting mode

• Transponder code • Reply active
modified • Identify function active
• VFR squawk code
(active)

Reply active

IDENT function active

Transponder in operation

Altitude Reporting

Standby

Tap to initiate the IDENT function (code unmodified)

Tap to accept modified code and initiate IDENT function

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2.18 Remote Control

Transponder functions are controllable from a connected G3X Touch display.
Control features include:
• Squawk code • Transponder mode
• IDENT • ADS-B transmission
• Flight ID

For transponder control operation, consult the G3X Touch Pilot’s Guide.

2.19 XPDR Alert

If the transponder fails:
• Red “X” displays over the IDENT key
• Advisory message alerts
• XPDR control page is not available

Transponder fail annunciations are designed to be immediately recognizable.

If a failure occurs while the control page is active, the display automatically returns
to the previous page.

UNIT CONDITION
GNX 375 ADS-B interboard communication failure.

For information regarding pilot response to a transponder failure, consult the

AFMS.

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ADS-B Altitude Reporting

AVAILABLE WITH:
GPS 175 | GNC 355

FEATURE REQUIREMENTS
• GDL 88
FEATURE LIMITATIONS
• Display and control functionality dependent on GDL 88 configuration

2.20 ADS-B Control Panel

ADS-B Out controls are accessible via the ADS-B key.
The location of this key varies by unit type. On GPS 175,
it resides in the upper right corner of the display.
On GNC 355, it resides on the GDL 88 Status page.

1
2 3

Altitude Reporting Status

1 3 Flight ID Key
(from GDL 88)

2 Anonymous Mode Key

When interfaced to a GDL 88

GDL 88 Features
transceiver, GPS 175/GNC 355 allows
• Remote-mount ADS-B control over some aspects of the ADS-B
transceiver Out message and provides position
• Transmits ADS-B Out information to the GDL 88.
messages to ATC and other Not all installations allow pilot control
aircraft of ADS-B Out transmissions.
• Communicates ADS-B In
data to panel-mounted For more information, consult the
avionics for the display of GDL 88 ADS-B Transceiver
traffic and weather Pilot's Guide.

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2.20.1 ADS-B Key

FEATURE LIMITATIONS
• Functionality dependent upon GDL 88 configuration

Active Transponder Depending on the configuration

Transponder Mode (ALT)
of your GDL 88, tapping the
ADS-B key:
• Reports GDL 88 altitude
reporting status
Squawk Code OR
(as reported by GDL 88)
• Allows on/off control of the
GDL 88’s altitude reporting
function

“ALT” indicates that the unit is in altitude reporting mode.

This indication corresponds to the function status
annunciation on the control panel.

Control Panel
Annunciation

2.20.2 Enabling Anonymous Mode

FEATURE LIMITATIONS
• Availability dependent on GDL 88 configuration
During anonymous mode, the unit replaces identifying information in the ADS-B Out
message with a temporary randomized number for privacy while providing position
information. Instead of a flight ID, the unit transmits the call sign "VFR."

Tap ADS-B > Anonymous.

The key label changes from “Off” to “Armed.”
Tapping Anonymous again toggles the mode off.

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2.20.3 Assigning a Flight ID

FEATURE LIMITATIONS
• Availability dependent on GDL 88 configuration

If the flight ID is editable, tap Flight ID and assign a

unique identifier. The key is not selectable (read-only) when
the ID is received from the GDL 88.

Flight IDs are alphanumeric (upper-case only) and have an eight character limit.
The active flight ID displays by default.

2.21 GDL 88 Alert

If the GDL 88 fails:
• Red “X” displays over the IDENT key
• Advisory message alerts
• ADS-B reporting functions are not available

Failure annunciations are designed to be immediately recognizable. If a failure

occurs while the control page is active, the display automatically returns to the
previous page.

UNIT CONDITION
GPS 175
GDL 88 failure.
GNC 355

For information regarding pilot response to ADS-B failures, consult the AFMS.

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Pilot Settings
Unit customization options
allow you to:
• Set and display the CDI
• Specify runway criteria
• Set the date and time
• Specify COM radio
settings [1]
• Create shortcuts
• Set the display units
• Adjust display
brightness
Other setup options allow
you to monitor time in flight
and create custom reminder
messages. These settings
reside in the system Utilities.
For details about COM
radio settings and Connext
Setup options, refer to the
respective section.
[1] GNC 355/355A only.
[2] GNC 355A only.

2.22 CDI Scale

Set the scale for the course deviation indicator. Scale
values represent full scale deflection for the CDI to
either side.
Options: • 0.30 nm • 1.00 nm • 2.00 nm • Auto

Scale selections are reflected in the annunciator bar.

Auto Setting Annunciation Manual Setting Annunciation

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CDI scale is set to “Auto” (default). At the default setting, the scale sets to
2.0 nm during the en route phase of flight.
Aircraft is within 31 nm of the destination airport (i.e., terminal area).
The scale linearly ramps down to 1.0 nm over a distance of 1 nm.
Aircraft is leaving the departure airport. The scale is set to 1.0 nm once the
aircraft is over 30 nm from the departure airport. It begins to gradually ramp up to
2 nm when the flight phase changes from terminal (TERM) to en route (ENR).
During GPS approach operations, the scale gradually transitions down to an angular
scale.
Aircraft is 2.0 nm before the final approach fix. Scaling tightens from 1.0 nm to
the angular full-scale deflection defined for the approach (typically 2.0º).

Selecting a lower value (0.3 nm or 1.0 nm) prevents the selection of higher scale
settings during ANY phase of flight. Example: If you select 1.0 nm, the unit uses
this setting for en route and terminal phases, and ramps down further during
approach.

2.22.1 Horizontal Alarm Limits

Horizontal alarm limits (HAL) are used to compare against GPS position integrity.
These protection limits follow the CDI scale, unless the corresponding flight phase
requires a lower HAL. For example, the selected scale setting is 1.0 nm, but full-scale
deflection during approach still follows the approach scale setting (0.30 nm).

FLIGHT HORIZONTAL
CDI SCALE
PHASE ALARM LIMIT
Approach 0.30 nm or Auto 0.30 nm
Terminal 1.00 nm or Auto 1.00 nm

En Route 2.00 nm or Auto 2.00 nm

Oceanic Auto 2.00 nm

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2.22.2 CDI On Screen

AVAILABLE WITH:
GPS 175 | GNX 375

Toggling this setting displays the CDI scale on screen.

When active, a CDI with lateral deviation indicator displays
below the GPS NAV Status Indicator key.

CDI OFF CDI ON

Only the Flight Plan page The CDI provides no indications

access key is available. without an active flight plan.

Lateral Deviation Indicator Visual Approach Guidance

Lateral deviation indications Advisory horizontal guidance

display when there is an active annunciations appear when a
flight plan. visual approach procedure is
active.

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2.23 Airport Runway Criteria

Specify runway criteria from the System Setup app.
Selections determine which airports are suitable when
using the nearest airport search feature.
During an approach, the terrain alerting algorithm uses
airport runway settings to avoid nuisance alerts.

2.23.1 Runway Surface

Tap Runway Surface and then select
Runway Surface Options the runway surface type.
• Any • Hard Only Selecting “Any” allows all surface types
• Hard/Soft • Water to appear in the nearest airport list and
be considered for use by Terrain.

2.23.2 Minimum Runway Length

Specify a minimum runway length to:
• Exclude airports with shorter runways from the nearest airport list
• Inform the terrain function of which airports are available for use, so that
terrain alerts do not generate when landing at one of these airports
Typing “0” allows runways of any length to appear in the nearest airport list and be
considered for use by Terrain.

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2.24 Clocks & Timers

2.24.1 Timers
Monitor time in flight using three available timer types.

Timer settings are accessible via the Utilities menu

page. Toggle between timer types using the
provided display key.

Clock/Generic Timer Trip/Departure Timers

Stopwatch style counter. Measure elapsed airborne time

Count up or count down. since the last ground-to-air
Specify countdown time transition. Set timer to start at
using the preset function. unit power up or once the
aircraft is in air.

Controls: Controls:
• Direction (Up, Down) • Criteria (Power On, In Air)
• Start • Stop • Timer Preset • Reset Timer

2.24.2 Clock
Specify the time format and local offset. Settings
reside in System Setup.
Format options include 12 hour, 24 hour, and UTC.

If a 12 hour or 24 hour clock is selected:

Tap Local Offset > Specify the appropriate offset value from UTC.

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2.25 Page Shortcuts

A knob shortcut option allows you to customize slots 2 and 3 of
the locater bar. Slot one is reserved for the Map page.
Tap a slot key and assign a page to that slot.

Depending on configuration, Traffic

Page Shortcut Options
and Weather shortcuts may not be
• Traffic • Nearest available.
• Terrain Airport Verify shortcut operation once
• Weather • Flight Plan complete.

Tapping Restore Defaults returns both slots to their default

settings (Terrain for Slot 2, Nearest Airport for Slot 3).

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2.26 Alerts Settings

Airspace alerts generate a message. They rely on three-dimensional
data (altitude, latitude, and longitude) to avoid nuisance alerts.

FEATURE LIMITATIONS
• Alert altitudes are dependent on aircraft and airspace altitudes and the
pilot-specified altitude buffer value

Control keys allow you to select which airspace boundaries

generate an alert annunciation upon entry.

Alert boundaries for controlled airspace are

sectorized to provide complete information on
any nearby airspace.
Alert settings do not alter the depiction of
airspace, nor do they change Smart Airspace
settings on the Map page.
With the exception of Altitude Buffer, airspace
alert options are on/off only.

Airspace alerts for Prohibited airspace

cannot be disabled.

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2.27 Unit Selections

Customize the display unit settings. Tapping a parameter key
opens a menu of the available unit types.

PARAMETER SETTINGS
• Nautical Miles (nm/kt)
Distance/Speed
• Statute Miles (sm/mph)
• Celsius (ºC)
Temperature
• Fahrenheit (ºF)
• Magnetic (º)
NAV Angle • True (ºT)
• User (ºU)
• Specify number of degrees for east or west (ºE, ºW)
Magnetic
Variation • Available only when “User (ºU)” is the active
NAV angle

SPECIFY UNIT TYPE

1. Review the current unit selections.
2. Tap the applicable parameter key.
3. Select a unit type.

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2.28 Display Brightness Control

Depending on configuration, display brightness is controlled using
inputs from the built in photocell, aircraft dimmer bus, or both.

2.28.1 Automatic Brightness Control

Dimming is limited to prevent on screen indications from becoming unreadable. The
built in photocell automatically controls display brightness based on ambient light
levels.
Backlight Manual Offset
Intensity Level Indicator
During automatic control, the pilot
may still adjust brightness using
the manual offset controls in the
Backlight page.
The unit retains manual offset
settings over power cycles.

Decrease Increase
Backlight Backlight

2.28.2 Manual Brightness Control

Optionally, the unit is configurable to use an aircraft dimming bus for display
brightness control. Upon reaching minimum input level, display brightness reverts to
the photocell. This prevents the display from going black in the event of a dimmer
input failure.

Installer configured curves determine the amount of change in brightness that

occurs in response to a control adjustment.
If brightness control is not satisfactory, contact a Garmin dealer to adjust the
lighting curves.

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2.29 Scheduled Messages

Create custom reminder messages and set when they will display.
Allows one time, periodic, and event-based message types.

Active reminders appear at the top of

the scheduled message list. This list is
accessible via the Utilities menu page.
Examples: • “Call FBO” • “Close flight
plan” • “Switch fuel tanks”

CREATE A REMINDER MESSAGE

1. Tap Create Scheduled Message.
2. Specify the message type, content, and countdown timer value.

2.29.1 Message Types

TYPE DISPLAYS...
When the timer expires, or following each power cycle until
One time
message deletion.
After a specified duration of time. Countdown repeats once
Periodic
the message displays.
According to a specified date and time. Message timer not
Event
applicable.

2.29.2 Modifying Scheduled Messages

Once created, these messages may be modified at any time. Selecting a scheduled
message opens an options menu.

EDIT MESSAGE
This function is accessible from either the Scheduled Messages page or the system
message list.

RESET TIMER
Restarts the countdown timer.

DELETE MESSAGE
Confirming this request removes the selected message from the list.

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Status Indications
2.30 Alert Types
The unit generates annunciations in response to various conditions that may occur.
These abbreviated messages are grouped according to the level of urgency and
required response. They display in order of priority, from highest to lowest.
1. Warnings
2. Cautions
3. Mode & function advisories

WARNINGS & CAUTIONS

Warnings require immediate attention. Cautions indicate the presence of an
abnormal condition that may require pilot action. A warning may follow a caution if
no attempt is made to correct the condition (e.g., altering the aircraft’s path toward
the alerted terrain or obstacle).

MODE & FUNCTION ADVISORIES

Advisories provide status and operating information.
System advisories. These display on a dedicated message list. Depending on the
number of advisories, this list may be scrollable.
Function or mode specific advisories. These appear as unobstructed
annunciations in the annunciator bar.

Advisory list for GPS 175 shown as typical.

3
Advisory Messages & Annunciations

1 System Messages List 3 Mode Advisory Annunciation

2 Message Key

For a complete list of all system-related advisories, refer to section 6.

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2.30.1 Alert Annunciations

Alert annunciations are abbreviated messages that indicate an alerted function or
mode. The color of the annunciation depends on the alert type.
• Warnings display in white text on red
ALERT COLORS
background
WARNING • Cautions display in black text on amber
CAUTION background
ADVISORY • Function or mode specific advisories display in
black text on white background

When an alert is triggered, the annunciation flashes by alternating text and

background colors. It turns solid after five seconds. All annunciations remain active
(solid) until the condition is resolved or no longer a threat.

ANNUNCIATION LOCATION
Alerts and informational advisories annunciate in the annunciator bar along the
bottom of the screen.

Alerts, Inhibits Flight From/To Procedure Waypoint, Power

and Test Mode Phase Off, and COM
Advisories Advisories

Annunciator Bar

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2.30.2 Pop-up Alerts

If a warning or caution relating to terrain or traffic occurs, a pop-up window may
display. These pop-ups only appear if the alerted function’s associated page is not
active.
Each pop-up alert provides:
Pop-up Alert Priority
• Threat indication
In the event of simultaneous
alerts, pop-up windows display • Alert annunciation
in the following order: • Option to inhibit or mute the alert
1. Terrain alerts • Control for closing the pop-up window
2. Traffic alerts • Direct access to the associated page

2 5

3
Pop-up Alert Layout

1 Threat Indication 4 Alert Inhibit Key

2 Close Pop-up Window Key 5 Go to <Page> Key

3 Alert Annunciation

To open the indicated page, tap Go to <Page>.

To acknowledge the alert and return to previous page view, tap Close.

2.30.3 Aural Alerts

FEATURE LIMITATIONS
• GNX 375 only (traffic alerts)*
• Mute alert function is applicable only to the active aural alert
(does not mute future alerts)

Traffic alerts are accompanied by an aural voice message.

Voice gender is configured during installation.
A Mute Alert key allows you silence the active traffic alert
voice message.
* GPS 175/GNC 355 systems interfaced to a traffic system (GDL 88 or GTX 345): Aural alerts are
available. They are provided directly from the traffic system LRU to the audio panel.

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2.31 System Status

View information specific to the unit and its software. Refer here
when contacting customer service.

DATA FIELDS CONTROLS

• Serial number Database Info access keys:
• System ID • Active
• Main software version • Standby
• GPS/WAAS software version
• COM board software version For more about active and standby
(GNC 355/355A only) databases, refer to section 2.2.

• Transponder software version

(GNX 375 only)

2.32 GPS Status

Monitor GPS receiver performance, establish a baseline for normal
system operation, and troubleshoot weak or missing signal issues.

This page provides a visual reference of GPS receiver functions, including:

• Current satellite coverage • GPS solution and receiver status
• Phase of flight • Position accuracy
• Present position
(latitude and longitude)

SKY VIEW DISPLAY

• Depicts satellites currently in view as well as their
respective positions
• Outer circle represents the horizon
(with north at the top of the circle)
• Inner circle represents 45° above the horizon
• Center point shows the position directly overhead

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SIGNAL STRENGTH INDICATIONS

A graph shows GPS signal strength for up
Satellite SVIDs
to 15 satellites. As the GPS receiver locks
Each bar is labeled with the SVID onto satellites, a signal strength bar appears
of the corresponding satellite. for each satellite in view.
Numbers vary according to Graph symbols depict the progress of
satellite type. satellite acquisition. Some data may not
• GPS: 1 to 31 display until the unit has acquired enough
• SBAS: 120 to 138 satellites for a fix.

SYMBOL CONDITION
Not present Receiver is searching for the indicated satellites.
Gray bar, empty Satellite located.

Gray bar, solid Satellite located, receiver is collecting data.

Yellow bar, solid Data collected, but satellite is excluded from position
solution (i.e., it is not in use).
Cyan bar, Satellite located, but FDE excludes it for being a faulty
cross-hatch satellite.

Cyan bar, solid Data collected, but receiver is not using satellite in the
position solution.
Green bar, solid Data collected, satellite in use in the current position
solution.
D (inside bar) Differential corrections are in use (e.g., WAAS).

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POSITION ACCURACY FIELDS

Information fields indicate the
LABEL POSITION DATA accuracy of the position fix.
EPU Estimated Position Uncertainty HFOM and VFOM values
HDOP Horizontal Dilution of Precision represent 95% confidence levels
in horizontal and vertical
HFOM Horizontal Figure of Merit
accuracy.
VFOM Vertical Figure of Merit Lower values mean higher
EPU is the horizontal position error estimated by the accuracy. Higher values are the
fault detection and exclusion algorithm, in feet or
meters.
least accurate.

FDE PREDICTION

NOTE
Under FAR parts 91, 121, 125, and 135, FDE must be used prior to all
oceanic or remote area flights using the GPS 175/GNX 375 as a primary
means of navigation.

This program uses an algorithm to predict FDE availability. If the unit has not been in
operation for more than six months, acquiring satellite data to establish almanac and
satellite orbit information may take 5 to 10 minutes.

2.32.1 Circle of Uncertainty

FEATURE LIMITATIONS
• Available only when the aircraft is on ground
• Displays only on the Map page

Circle of
Uncertainty
• Depicts area surrounding the ownship when GPS
cannot accurately determine aircraft location
• Expands as GPS horizontal accuracy degrades
• Shrinks as accuracy improves
• Translucent with minor shading so as not to
obstruct other features

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2.32.2 SBAS Providers

NOTE
Operating with SBAS active outside of the service area may cause elevated
EPU values to display on the status page. Regardless of the EPU value
displayed, the LOI annunciation is the controlling indication for
determining the integrity of the GPS navigation solution.

SBAS supports wide area or regional augmentation through the

use of additional satellite broadcast messages.
Tap this key and select from the list of providers.

PROVIDER SERVICE AREAS

EGNOS Most of Europe and parts of North Africa.

GAGAN India

MSAS Japan only.

WAAS Alaska, Canada, the 48 contiguous states,

and most of Central America.

2.32.3 GPS Status Annunciations

Once the GPS receiver determines the aircraft’s position, the unit displays position,
altitude, track, and ground speed data. GPS status annunciates under the following
conditions.

ANNUNCIATION CONDITION
GPS receiver uses last known position and satellite orbital
Acquiring data (collected continuously from satellites) to determine
which satellites should be in view.
3D Nav 3-D navigation mode. GPS receiver computes altitude
using satellite data.
3D Diff Nav 3-D navigation mode. Differential corrections from SBAS
provider are in use.
LOI Satellite coverage is insufficient to pass built-in integrity
monitoring tests.

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2.32.4 GPS Alerts

The following alert conditions can affect GPS accuracy.

INDICATIONS FAULT TYPE CONDITION

Integrity of the GPS position does
not meet the requirements for the
Yellow “LOI”
Loss of Integrity current phase of flight. Occurs
annunciation.
before the final approach fix
(if an approach is active).
Aircraft is after the final approach
fix and GPS integrity does not meet
the active approach requirements.
Insufficient number of satellites
Unit invalidates supporting aircraft position (i.e.,
active course more than 5 seconds pass without
guidance. Loss of Navigation adequate satellites to compute a
Annunciation is position).
specific to cause. GPS sensor detects an excessive
position error or failure that cannot
be excluded within the time to
alert.
On-board hardware failure.
Yellow “No GPS
Position”
Unit cannot determine a GPS
annunciation. Loss of Position
position solution.
Ownship icon not
present

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2.33 ADS-B Status

FEATURE REQUIREMENTS
• GDL 88 or GTX 345 ADS-B transceiver (GPS 175 and GNC 355/355A only)
OR
• GNX 375

STATUS PAGE ACCESS KEY

Tap this key to view last uplink time and GPS source information.
GPS 175/GNC 355/355A: Key label reflects the configured ADS-B source.

ADS-B Source: GDL 88 ADS-B Source: GTX 345

GNX 375: Key label reads “ADS-B Status.”

UPLINK TIME
This field displays the number of minutes
TEXT MINUTES SINCE
since last uplink. Digital values may
COLOR LAST UPLINK change color depending on duration.
Green <5 “> 15” displays when the time exceeds
5 to 15 15 minutes.
Yellow
> 15 Dashes indicate when valid uplink data is
unavailable (e.g., the device is offline).

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FIS-B WX STATUS
Tap this key to view the status of FIS-B weather products.
This page is also accessible from the FIS-B Weather setup
menu.

TRAFFIC APPLICATION STATUS

Tap this key to view the status of the three traffic
applications: • AIRB • SURF • ATAS (airborne alerts)

ANNUNCIATION DESCRIPTION
Application is running. Required ownship data is
On
available and meets the performance criteria.
Application is configured. Required input data is
Available to Run
available and meets the performance criteria.
Required input data is not available due to a failure
Unavailable to Run
(e.g., aircraft surveillance application process failed).
Required input data is available, but does not meet
Unavailable - Fault the performance criteria or is not available due to
non-computed data conditions.

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Logs
2.34 Export to SD Card
A logging function stores WAAS diagnostic and ADS-B traffic data
(GNX 375 only) in the unit’s internal memory. This information is
available for export to an SD card for later analysis.

FEATURE REQUIREMENTS
• SD card
FEATURE LIMITATIONS
• ADS-B traffic data logging available on GNX 375 only

To export a diagnostic log:

1. Insert an SD card.
2. Tap Utilities > Logs.
3. Select WAAS Diagnostic Log or ADS-B Log.
If no log files are present, these keys are not available.

WAAS Diagnostic Log Functions

• Generates log files automatically upon unit power-up
• Overwrites oldest file when the internal log reaches capacity
• Exports to the “log_files” folder on the SD card

ADS-B Log Functions (GNX 375 only)

• Generates log files automatically upon unit power-up
• Overwrites oldest file when the internal log reaches capacity
• Exports to the “log_files” folder on the SD card

ADS-B log files may take several minutes to export.

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3 Navigation
MAP
3.1 Map Setup ............................................................................................3-6
3.2 Map Interactions .................................................................................3-14
3.3 Map Overlays ......................................................................................3-20
ACTIVE FLIGHT PLAN
3.4 Collapse All Airways ............................................................................3-30
3.5 OBS .....................................................................................................3-30
3.6 Dead Reckoning ..................................................................................3-32
3.7 Parallel Track .......................................................................................3-33
3.8 Edit Data Fields ....................................................................................3-35
3.9 Flight Plan Catalog ..............................................................................3-35
3.10 Create a Flight Plan..............................................................................3-38
3.11 Flight Plan Map Overlays......................................................................3-40
3.12 GPS NAV Status Key ............................................................................3-42
DIRECT TO
3.13 Direct To Basics ...................................................................................3-43
WAYPOINTS
3.14 Waypoint Information..........................................................................3-49
3.15 Waypoint Selection..............................................................................3-52
3.16 Create User Waypoints ........................................................................3-55
3.17 Nearest................................................................................................3-61
PROCEDURES
3.18 Flight Procedure Basics.........................................................................3-64
3.19 Departures ..........................................................................................3-68
3.20 Arrivals ................................................................................................3-70
3.21 Approaches .........................................................................................3-72

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NAVIGATION
APPS & FUNCTIONS

Menu selections vary based on features and optional equipment installed with
Garmin avionics.

[1] NEXRAD and Terrain overlays are mutually exclusive.

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Map
To increase situational awareness, Map depicts the aircraft’s current
position relative to land, aeronautical, weather, and traffic
information.

FEATURE REQUIREMENTS
• Active GPS source (aircraft position symbol)
• UAT receiver (FIS-B weather)
FEATURE LIMITATIONS
NEXRAD and terrain overlay functions are mutually exclusive. Enabling one
automatically disables the other.
GNC 355 shown as typical.
6 5

7
3
8
2

9
1

Default Map Features

Aircraft Symbol
Depicts current aircraft position and orientation.
1 • Tip represents actual aircraft location
• Symbol type is dependent upon configuration
• Absent if a GPS source is not available

Track Vector
2
Current ground track indication.

Basemap
3
Presents a graphical depiction of land and water data.

User Field
Customizable data field appearing in each corner of the map.
Default user fields are as follows.
4 GPS 175/GNX 375: • distance • ground speed • desired track and track
• distance/bearing from destination airport
GNC 355/355A: • distance • ground speed • desired track and track
• from, to, and next waypoints

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NAV Range Ring

5 Displays current direction of travel on a rotating compass.
Orientation: Magnetic north

Map Range Indicator

6 Displays current map range in the upper left quadrant of the range ring
(i.e., the distance from the aircraft to the range ring).

North Indicator
7
Indicates True north.

Page Orientation Label

• North Up orients map to True north.
8 • Heading Up orients map to current aircraft heading (requires
heading data source interface).
• Track Up orients map to current aircraft GPS track.

Map Overlay Icons

9 Indicates status of overlays at the current map range.
Includes: obstacles, power lines, precipitation, terrain, and traffic

AUTOMATIC ZOOM
Map remembers the last zoom range for each
AIRCRAFT DEFAULT
aircraft state, and automatically resumes this
STATE ZOOM view when the aircraft transitions between air
Ground 0.50 nm and ground states.
Air 10.0 nm

FEATURE LABELS
To maintain readability, map feature labels remain uniform at all zoom levels.

TRAFFIC UNITS
System Units page selections do not affect the display of traffic on Map.

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LAND AND WATER DEPICTIONS

Land and water data are for general reference only. Data accuracy is not suitable for
use as a primary navigation source. The information is intended to supplement and
not replace official government charts and notices.

DATA DRAWING ORDER

The electronic map draws data in order of priority, from highest (1) to lowest (25),
with higher priority features drawn atop those of lower priority.

LEVEL FEATURE LEVEL FEATURE

1 Traffic 14 Surface Conditions
2 Ownship 15 Airspace
3 Flight Plan 16 Waypoints
4 Terrain-FLTA 17 Airways
5 Point Obstacles 18 Reference Grid
6 Line Obstacles 19 Radar Coverage
7 TFR 20 NEXRAD
8 METAR 21 SafeTaxi
9 Winds Aloft 22 Runways
10 SIGMET 23 Terrain
11 AIRMET 24 Basemap
12 PIREP 25 Topo
13 AIREP

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3.1 Map Setup

Map setup options allow you to customize
the display of aeronautical information.
Tap Menu when you need to:
• Change map orientation settings
• Configure user fields
• Adjust the map detail level
• Enable map overlays
• Select a NEXRAD source
• Filter airspace data according to
altitude
• Specify airway types and range values
• Expand the forward-looking view for
improved situational awareness

RESTORE MAP SETTINGS

With the exception of user fields, this key
restores all original factory map settings.

[1] On/off functionality only.

[2] NEXRAD and Terrain overlays are mutually exclusive.

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3.1.1 Configure User Fields

Displays Map in configuration mode,
Default User Fields allowing you to customize the display
• DIS - Distance of data in each corner of the page.
• GS - Ground Speed
• DTK - Desired Track [1] User fields are useful during time
• TRK - Track [1] sensitive and work load intense
• Flight Plan - From/To/Next [2] phases of flight.

[1] GNC 355/355A combines DTK and

TRK into a single user field.
[2] GNC 355/355A only

In configuration mode:
• All four data fields change to
selectable keys
• All other map elements are
inactive

Tap any key and select from the list of available data types.
Displayed units change based on selection.

Selecting “OFF” removes the

corresponding user field from the
map page.

User Field
Absent

Tapping Restore User Fields returns all fields to their

default settings and removes the TOPO scale if present.

GPS 175/GNX 375:

For convenience, Map user fields may be toggled on and
off by pushing the control knob.
Fields remain hidden when you use the knob shortcut to
move between Map and the Active FPL page. They
reappear in their respective corners when you return to
the Home page or use the knob to move between Map
and any other application.*
* This functionality is not available on GNC 355/355A.

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USER FIELD OPTIONS

LABEL FIELD TYPE LABEL FIELD TYPE
BRG Bearing to waypoint GSL GPS altitude
Distance/bearing from
DIS/BRG
destination airport (i.e., MSA Minimum safe altitude
APT
the straight line distance)
OAT Outside static air
DIS Distance to waypoint
(static) temperature
Distance to destination
DIS to Outside total air
(i.e., the distance along OAT (total)
Dest temperature
the flight plan)
DTK Desired track Time Current time
Time to
DTK, TRK Desired track and track [1] Time to top of descent
TOD
ESA En route safe altitude TKE Track angle error
ETA Estimated time of arrival Trip Timer Timer display
ETA at
ETA at destination TRK Track
Dest
ETE Estimated time en route VSR Vertical speed required
ETE to
ETE to destination Wind Wind speed and direction
Dest
From, to, and next
XTK Cross track error
waypoints [1]
Generic
Timer display OFF Do not display data field
Timer
GS GPS ground speed

[1] GNC 355/355A only.

“Destination” refers to the missed approach point (if an approach is loaded) or

the final airport in the flight plan.

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3.1.2 Map Orientation

Sets the orientation of the map display.
Options include North Up, Track Up, or Heading Up.
Label below the North indicator shows the current orientation.

This label is absent when the info banner is active.

North Up is useful when zoomed out to view the entire route or a frontal system
on a NEXRAD display.

3.1.3 North Up Above

Sets the range at which map orientation changes to North Up.

Using the North Up Above feature causes the screen to switch at certain zoom
levels. This is useful as a shortcut to quickly increase situational awareness.

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3.1.4 Visual Approach

Sets the distance from the
destination airport at which the
Visual Approach selector key
becomes active.

Visual Approach
Key

To reduce page clutter, the key moves to the upper

left corner of the display when the info banner is
active.

3.1.5 TOPO Scale

Displays a topographical elevation
scale. To remove the scale:
• Toggle TOPO Scale off
OR
• Tap Restore User Fields

3.1.6 Range Ring

Provides a more precise indication
of distance between the aircraft
and map objects.

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3.1.7 Track Vector

FEATURE LIMITATIONS
• Indication absent when aircraft velocity is < 30 kt
Indicates the current ground track.
Arrow tip represents aircraft position
at the specified time interval
(if the aircraft maintains current
ground track during that time).

Track vector length options display as a dashed line and arrow extending from
the aircraft icon, showing current track and distance the aircraft will travel in the
selected time.
If the track vector is placed over a point on the map, and no data is entered into
the system, the unit indicates a wind-corrected GPS track to that point. This is
useful for intercepting airways and radials, making small but positive lateral
corrections during approaches, and in setting up for arrivals in the terminal area.

3.1.8 Ahead View

FEATURE LIMITATIONS
• Not available when page orientation is North Up
Repositions ownship near the
bottom of the page to expand the
view ahead.

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3.1.9 Map Detail

Changes to the map detail level take effect immediately. Options include:
• Full • High • Medium • Low

FEATURE FULL HIGH MEDIUM LOW

Small Cities
Medium Cities
Large Cities
Freeways
Highways
Roads
Railroads
Basemap Labels
VORs
NDBs
Line Obstacles
Point Obstacles
Airspaces that are not
prohibited or restricted
Waypoints
SafeTaxi
Restricted Airspaces
Prohibited Airspaces

Present Removed

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AVIATION DATA SYMBOLS

Non-towered, Non-towered, serviced
non-serviced airport [1] airport [1]

Towered, non-serviced Towered, serviced airport

airport [1] [1]

Soft surface, non-serviced Soft surface, serviced

airport airport

Restricted (private) airport Unknown airport

Heliport ILS/DME or DME only

Intersection LOM

NDB TACAN

VOR VOR/DME

VORTAC VRP

Runway extension

[1] Symbol depicts orientation of longest runway.

LAND DATA SYMBOLS

Railroad National Highway

River/Lake Freeway

State/Province Border Small City

Local Road Medium City

Local Highway Large City

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3.2 Map Interactions

3.2.1 Basic Interactions

Typical map interactions include zoom, pan, and object selection.

PAN & ZOOM

Panning allows movement of the map in any direction without change to the current
zoom setting. Zooming adjusts the current magnification level between pre-defined
range parameters.

Before flight, consider which

map scales are best for achieving
the desired level of detail and
map information.
Generally, use smaller map
scales in and around terminal
areas and whenever precise
Maximum Scale navigation is required (e.g.,
Value
airway or radial intercepts).
During cruise flight, increase the
map scale to better balance
navigation, situational
awareness, and decision
making.

Minimum Scale
Value

OBJECT SELECTION
Tapping any object or location on the map displays a map pointer and an information
banner.

MAP POINTER
This symbol indicates point of contact on the map. A gray circle
highlights any selected waypoint or obstacle.

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MAP INFO
Selected Airport

Available information and

controls are dependent upon
object or location type and
proximity to other objects.

Selecting an airport icon displays the airport’s highest

field elevation. A map pointer icon corresponds with
the touch point on the map.

An information page access key displays when you

select a waypoint, airspace, airport, airport surface
hot spot, or TFR.

DATA FIELDS CONTROLS

• Pan mode annunciation • Map Pointer/Create Waypoint
• Bearing and distance from current • Graphical Edit
aircraft position to map pointer • Next (for stacked objects)
• Location elevation • Associated information page
• Maximum altitude AGL and MSL access key, if applicable
for obstacles

STACKED OBJECTS
To move the selector through each object in proximity of the map
pointer, select an object and tap Next.

Overlapping objects may

be difficult to identify at
a given zoom level.
Stack
Active
Selection

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AIRSPACE INFO
Selected Airspace

When selected, active airspace

boundaries change color.
Tapping Airspace Info opens
the associated information
page.

Data fields display information

specific to the selected airspace.
Available controls reside along
the bottom of the page.

DATA FIELDS CONTROLS

• Airspace name and type icon • Frequencies: View a list of all
• ATC entity responsible for the related radio frequencies
airspace, if applicable • Preview: View the airspace
• Floor and ceiling altitudes boundary and a 2-D map of the
• Proximity to airspace surrounding area

3.2.2 Graphical Flight Plan Editing

FEATURE LIMITATIONS
• Parallel track offsets do not apply to the temporary flight plan

Graphical editing allows quick changes to the active flight plan

from the map display.

Map provides identifier keys for

selecting waypoints that are
stacked or in close proximity. If the
displayed options are not preferred,
tap away or select Cancel.

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TEMPORARY FLIGHT PLAN BANNER

An information banner displays waypoint selections made during graphical edit
mode. All selections become active once you tap Done.

Lists up to four waypoint

identifiers

Ellipse indicates additional waypoints

Initial waypoint in flight plan always appears first

Tapping Undo reverses the last edit. You may undo up to nine of
the most recent actions.
On the map, dragging and releasing the leg away from any
waypoints removes it from the temporary flight plan.

To exit edit mode without saving changes, tap Cancel.

ADD WAYPOINT TO AN EXISTING LEG

You can edit, add, or omit flight

plan legs by tapping or dragging
your finger directly on the map.

Existing Leg

Selected Waypoint
1. Tap any location on the
map.
2. Tap Graphical Edit.

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3. Tap and drag the leg to a

new waypoint or airway,
then release.

The temporary flight plan

adjusts to show the new route.
If no other edits are necessary,
tap Done.

The new waypoint now appears

in the active flight plan.

GPS 175 & GNX 375:

Active route identifiers also appear on the GPS NAV Status
indicator key in the lower right corner of the display.
GNC 355/355A:
If configured, a user field shows active route identifiers on
Map.

Delete any existing flight plan before attempting to graphically edit a direct-to
waypoint. Map does not allow the addition of an intermediate waypoint
between the current position and a direct-to waypoint unless the waypoint is in
the flight plan.

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REMOVE WAYPOINT FROM FLIGHT PLAN

You can tap and drag any leg to
another waypoint or airway, or
release it away from any
waypoint if an alternate
destination is not preferred.

CREATE LEGS WITHOUT AN EXISTING FLIGHT PLAN

If an active flight plan does

not exist, you can graphically
create one without ever
leaving the Map page.

1. Tap any location on the map > Graphical Edit.

2. Begin tapping waypoints to add them to the temporary flight plan.
3. Tap Done.

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3.3 Map Overlays

Overlay data controls reside in the Map
Overlay Selections menu. Changes to an overlay setting
• TOPO • TFR take effect immediately.
• Terrain • Airspaces NEXRAD and Terrain overlays are
• Traffic • Airways mutually exclusive. Enabling one
automatically disables the other.
• NEXRAD • Obstacles &
Wires Weather product and traffic overlays
• METAR
are optional on GPS 175 and GNC 355.
They are available only when configured
for ADS-B In equipment.

3.3.1 Overlay Controls

Control keys enable the specified overlay function only and
do not activate interfaced equipment. Control keys remain
active even in the absence of required data.
Overlay controls reside in the Map menu.

TOPO
• Overlays topographical data
and ground elevation scale
• Depictions are similar to a VFR
sectional
• Pilot-selectable topographical
elevation scale available

TERRAIN
• Overlays terrain map data
• Color shading depicts terrain
elevation relative to the
aircraft’s altitude

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TRAFFIC
• Overlays traffic information
• Filter selection on the Traffic
page determines altitude range
• Feature optional for GPS 175
and GNC 355

NEXRAD
• Overlays datalink precipitation
weather information
• Options include: CONUS,
Regional, or off (none)
• Feature optional for GPS 175
and GNC 355

METAR
• Overlays graphical METARs
• Tapping flag icon displays
information on current and
forecast conditions
• Available only in areas covered
by the active navigation
database
• Feature optional for GPS 175
and GNC 355

TFR
• Overlays graphical TFRs
• Tapping this airspace symbol
displays details regarding the
restricted area
• Feature optional for GPS 175
and GNC 355

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AIRSPACES
• Overlays airspace boundaries
with altitude labels
• Filter selection determines
altitude range

AIRWAYS
• Overlays the selected airway
type(s) with identifier labels
• Options include: low, high, all,
or off (none)
• High altitude airways are green,
low altitude airways are gray

OBSTACLES & WIRES

• Overlays obstacle and wire data
• Color shading depicts an
object’s elevation relative to the
aircraft’s altitude

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3.3.2 Overlay Status Icons

Icons indicate which overlays are present at the current map range. A crossed out
icon means the overlay is active, but data is unavailable due to a failure, test, or
standby condition (where relevant).
The absence of an overlay icon means one of two possible conditions:
1. Overlay not present at the current detail level or zoom setting.
2. Overlay control is off.

METAR NEXRAD

Obstacle Power Line

TFR Traffic

Terrain Data not available

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3.3.3 Smart Airspace

Garmin’s Smart Airspace feature
automatically de-emphasizes
non-pertinent airspace away from
the aircraft’s current altitude.
When an airspace’s vertical
proximity to the aircraft is
>1,000 ft:
Smart Airspace Off • Its boundary becomes
transparent
Non-pertinent
Airspace • All associated altitude labels
turn gray
This range increases linearly to
2,000 ft as the aircraft ascends to
10,000 ft.

Smart Airspace On

SMART AIRSPACE CRITERIA

AIRCRAFT AIRSPACE PROXIMITY
ALTITUDE TO AIRCRAFT [1]
Sea level >1,000 ft
>10,000 ft 2,000 ft

[1] Vertical distance above and below aircraft altitude.

AIRSPACE DATA SYMBOLS

Class B Altitude
Class C/TCA
Label (ceiling/floor)

Class C Altitude
Class D
Label (ceiling/floor)

Class D Altitude
Restricted/Prohibited
Label (ceiling only)

TFR MIL

Class B/TMA Other/ADIZ

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3.3.4 SafeTaxi
SafeTaxi provides greater map detail
and higher image resolution at lower
zoom levels.

Feature labels denote:

• Runways
• Taxiways
• Airport landmarks

SafeTaxi Features
• Airport diagram overlay that includes hot spot information
• Aircraft position relative to taxiways, runways, and airport landmarks
• Pilot selectable range options

SAFETAXI DATA SYMBOLS

Runway Taxiway

Helipad Construction Area

Airport Beacon Unpaved Parking

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HOT SPOTS

SafeTaxi hot spots identify locations on an

airport surface where positional confusion
or runway incursions are likely to occur.
These known problem areas require
heightened attention by pilots.

Selecting the border of a hot

spot displays a brief summary of
the indicated hazard and an
information key.

Tapping this key provides additional location information.

Numbering corresponds to a list on the airport diagram.

The following airport features

may be deemed hot spots by
aviation authorities.
• Intersecting taxiways and
runways
• Complex ramp areas
• Directional limitations
• Limited wing-tip clearance
• Overflight risk

CONSTRUCTION SPOTS

There are no expanded detail keys or notes

associated with construction areas.

Construction Area Border

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Active Flight Plan

Current flight plan information displays as a scrolling list on the
Active Flight Plan (FPL) page.

FEATURE REQUIREMENTS
• Active flight plan
FEATURE LIMITATIONS
• Displays up to 100 waypoints for an active flight plan

2 1

7
3

4 6

Active Flight Plan Page

1 Selectable Data Field Columns 5 Add Waypoint Key

2 Waypoint Identifier Column 6 Leg Data

3 Active Leg Indicator 7 Waypoint Type Icon

4 Current Waypoint

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AIRPORT INFO
Procedure Airport Info For convenience, airport
Header Key information is directly accessible
from the procedure header.
This includes airports specified
in active approaches, arrivals,
and departures.
Tap Airport Info to open the
corresponding information
page.

FIX TYPE INDICATIONS

When applicable, labels indicate
LABEL FIX TYPE the fix type associated with an
iaf Initial Approach Fix identifier.
faf Final Approach Fix
map Missed Approach Point
mahp Missed Approach Hold Point
-p Parallel Track (no fix)

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ACTIVE LEG STATUS INDICATIONS

Magenta symbols denote active leg status on from/to/next waypoint
indications. Fix type symbols (e.g., FAF, MAP) correspond with labels
appearing on the flight plan.

IAF Arc Left

Holding Pattern
FAF
(Right Turns)
Holding Pattern
MAP
(Left Turns)

MAHP Active Leg Arrow

Parallel Track Direct To

Arc Right

GNC 355/355A:
Activating a direct-to course displays the corresponding fix symbol
and waypoint identifier in two locations:

Map User Field Active Direct To Fix Indicator

If configured, a user field shows Direct To key changes to show

the active waypoint identifier the active waypoint identifier
and fix type on Map. and fix type.

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3.4 Collapse All Airways

Airways automatically display as flight plan legs. A single airway may contain
numerous legs. Airways without an active leg collapse for simplification.
This does not affect airway legs shown on the external navigator(s).

Airway Indication
All airways begin with
an indicator field and
Expanded Airway end with an exit
Detail identifier.

To hide all waypoints

Airway Collapsed along an airway, but
Indication not the airway’s exit
waypoint, tap
Exit Waypoint Collapse All Airways.

3.5 OBS
The Omni Bearing Selector (OBS) allows you to select
between manual or automatic sequencing of waypoints.

When active, this function allows you to set the desired course To/From a waypoint
using the provided controls or with an external OBS selector on HSI or CDI.

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1. Tap OBS.
2. Specify a heading course.
CDI indicates the OBS heading.
The mode displays on the
annunciator bar.

GNX 375 shown as typical.

The unit retains the active To waypoint as a navigation reference even after passing
the waypoint (i.e., prevents sequencing to the next waypoint).
Tapping the key again resumes automatic sequencing of waypoints (normal mode).

SUSPEND/UNSUSPEND
SUSP UNSUSP

This key displays for leg types This key displays for legs that
that do not support OBS. auto suspend (e.g., leg holds,
missed approaches).

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3.6 Dead Reckoning

WARNING
DO NOT USE PROJECTED POSITION DATA AS THE ONLY MEANS OF
NAVIGATION.

Points About Dead Reckoning

• Provides limited navigation using the last known position and speed following
the loss of GPS navigation while on an active flight plan
• Becomes active after a loss of GPS position while navigating using an active
flight plan and the flight phase is either En Route or Oceanic
• Allowed only during en route and oceanic phases of flight

When dead reckoning mode is active:

• Map reports “No GPS Position”; overlays are not available
• DR mode annunciation replaces ENR or OCN
• Terrain functionality is not available
• Traffic displays on its dedicated page only
• CDI is not available

Dead reckoning mode ends once GPS position is restored.

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3.7 Parallel Track

Create a parallel course offset relative to the current flight
plan. Setup controls provide offset distance and direction
setting (left of track or right of track).

FEATURE REQUIREMENTS
• Active flight plan
FEATURE LIMITATIONS
• Function not available when Direct-to is active.
• Graphical editing of the active leg cancels the parallel track function
• Offset range: 1 nm to 99 nm
• Large offset values combined with certain leg types (e.g., approach) or leg
geometries (i.e., changes in track >120º) do not support parallel track

Once activated, a new track line appears to the

TRACK COLOR
left or right of the original course line at the
Offset Magenta specified distance. The aircraft navigates to the
Original Gray offset track with external CDI/HSI guidance now
driven from the parallel track.

A graphical depiction overlays on

the map.

Map

Corresponding fix symbols on the flight plan

indicate when the active leg is on a parallel track.

GPS 175 & GNX 375:

Active route identifiers also appear on the GPS NAV Status
indicator key in the lower right corner of the display.
GNC 355/355A:
If configured, a user field shows active route identifiers on
Map.

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To
WPT

Offset
rack To
lT WPT
na
igi
Or
Offset Distance
ck
Tra
From lel
WPT ral
Pa

Offset
From
WPT

ACTIVATE A PARALLEL TRACK

1. Tap Menu > Parallel Track.
2. Tap Offset and specify a distance between
1 nm and 99 nm.
3. Tap Direction and select left of track or
right of track.
4. Tap Activate.

To deactivate parallel track, tap Menu > Deactivate PTK.

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3.8 Edit Data Fields

To select a flight plan data column,
tap Edit Data Fields. Columns are
arranged in numerical order (1 - 3).
To restore columns to default display
settings, tap Restore Defaults.

Selections are identical for each column.

DATA FIELD SELECTIONS
By default, flight plan information fields
CUM Cumulative Distance display:
DIS Distance Column 1: DTK
DTK Desired Track Column 2: DIS
ESA En Route Safe Altitude Column 3: CUM
ETA Est. Time of Arrival
ETE Est. Time En Route

3.9 Flight Plan Catalog

Create, activate, edit, copy, and delete flight plans within the
catalog.

FEATURE LIMITATIONS
• Stores up to 99 flight plans with a maximum of 100 waypoints each

Departure Destination Each catalog entry includes a

WPT WPT route identifier, the route
distance, and en route safe
altitude.
The identifiers of the departure
and destination waypoints
Comment Distance
comprise the route identifier.
En Route Safe Altitude

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3.9.1 Catalog Route Options

Selecting a flight plan opens a menu. Changes to
the active flight plan take effect immediately.
• Activate the selected flight plan
(replacing the active flight plan)
• Reverse and activate the selected flight plan
• Preview a selected flight plan
• Make changes to a flight plan
• Copy the flight plan and modify it to create a
similar one
• Remove individual or multiple flight plans

ACTIVATE
Activating a stored flight plan overwrites the active flight plan.

INVERT & ACTIVATE

Reverse and activate the selected flight plan for guidance back to your original
departure point. The inverted flight plan is a copy. Changes do not affect the original
flight plan, which remains stored in the catalog.

PREVIEW
View the flight plan route as it will
appear on Map and on the Active
FPL page.
Options include Store, Edit, and
ACTV (Activate).

EDIT
Modify the selected flight plan on the Edit Catalog Flight Plan page.

COPY
Create a copy of the selected flight plan. A copy may be used as a starting point for
creating a similar flight plan. Select the copy and tap Edit to make modifications.

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DELETE A FLIGHT PLAN

Deleting the active flight plan does not delete the stored flight plan in the catalog.
From the FPL menu:
1. Tap Menu > Delete.
2. Confirm the request.

From the catalog:

1. Select a flight plan.
2. Tap Delete.
3. Confirm the request to delete all waypoints.

DELETE ALL CATALOGED FLIGHT PLANS

To remove all flight plans from the catalog:
1. Open the catalog.
2. Tap Menu > Delete All.
3. Confirm the request to clear the catalog.
4. Tap Delete Pending.
5. Confirm the request to remove all flight plans pending preview.

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3.10 Create a Flight Plan

NOTE
The unit cannot verify the accuracy of cataloged flight plans with modified
procedures.

There are three methods for creating a new flight plan.

CREATE FROM THE ACTIVE FLIGHT PLAN PAGE

1. Tap Flight Plan.
2. Delete the existing flight plan if necessary (Menu > Delete).
3. Tap Add Waypoint.
4. Select an identifier using the provided search options.
5. Repeat steps 3 - 4 for each waypoint in the route.

CREATE FROM MAP

Build a flight plan by selecting waypoints directly on the map using the Graphical Edit
feature. For more about this method, read section 3.2.2.

CREATE FROM THE FLIGHT PLAN CATALOG

1. Tap Flight Plan > Menu > Catalog.
2. Scroll to the end of the flight plan list.
3. Tap Create New Catalog Route > Add Waypoint.
4. Add waypoints using the provided search options.
5. Tap Menu > Preview > Store or ACTV (Activate).

As a general practice, never save flight plans with modified procedures in the
catalog.

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3.10.1 Flight Plan Waypoint Options

Selecting a waypoint identifier opens a menu.
Changes to the active flight plan take effect
immediately.
• Insert a new waypoint into a flight plan
• Add an airway or procedure
• Change the active leg
• Remove a selected waypoint
• Add a holding pattern to an existing waypoint
• View information about a waypoint

Insert Before Insert a new waypoint before the selected waypoint.

Insert After Insert a new waypoint after the selected waypoint.
Open the Procedures app to specify a departure, arrival,
or approach for loading. Available controls are dependent
Load PROC upon the relative position of the aircraft to the active flight
plan. Options may include: • Activate Approach
• Vectors to Final • Activate Missed Approach
Assign an airway and exit waypoint to the selected entry
Load Airway
waypoint (e.g., intersection, VOR).
Designate any TO waypoint as the active flight plan leg.
Activate Leg
Requires an active catalog flight plan.
Create a user-defined hold at the selected waypoint.
Hold at WPT Specify hold parameters and preview holding patterns
from a dedicated menu page.
Open the dedicated information page for the selected
WPT Info
waypoint.
Remove the selected waypoint or hold from the active
Remove
flight plan.

You may also set a direct-to course to any existing waypoint in the active flight
plan. Select an identifier and tap the Direct To key.
For details about Direct To features, refer to section 3.13.

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3.11 Flight Plan Map Overlays

3.11.1 Leg Status Indications

LEG STATUS COLOR Active, next, and previous flight plan legs
overlay on the Map page and are display
Active Magenta only.
Next & Future White
Past or Inactive Gray

Previous Leg(s)

Active Leg

Next Leg(s)

Leg Status Indications

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3.11.2 Flight Plan User Field

AVAILABLE WITH:
GNC 355/355A

FEATURE REQUIREMENTS
• Active flight plan for from-to-next route information

If configured, a
user field shows
active route
identifiers
(from-to-next)
on Map.

From, To, and

Next Identifiers

Map User Fields

No Flight Plan Exists Active Route Display

Underscores denote the Field shows active route

absence of an active leg. identifiers (from-to-next) and
leg types when a flight plan
exists.

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3.12 GPS NAV Status Key

AVAILABLE WITH:
GPS 175 | GNX 375

Located in the lower right corner of the display, the GPS NAV Status indicator key
displays from-to-next route information when an active flight plan exists. Indications
change based on active leg status.

No Flight Plan Exists Route Indicator Only

Tap for direct access to the Once the page is open, the
active flight plan. indicator is display only.
Page icon means an active Underscores denote the
flight plan does not exist. absence of an active leg.

Active Route Display CDI Scale Active

Label changes to show active Only from-to waypoints display

route identifiers (from-to-next) when the CDI scale is active.
and leg types. This function is controlled via
the System Setup screen.

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Direct To
Tapping this key opens the Direct To function. Search tabs
provide three different methods of waypoint selection.

FEATURE LIMITATIONS
• Not all flight plan entries are selectable using Direct To
(e.g., holds, course reversals)

3.13 Direct To Basics

Set a course to any waypoint using
Direct To is useful for Direct To.
quickly navigating to:
Selecting an identifier automatically
• New waypoints displays information about the
• An existing waypoint in the waypoint.
active flight plan
• Nearby airports When navigating to a single
waypoint (e.g., a nearby airport),
• Map waypoints
the Direct To function provides a
• An off-route course quicker alternative to using the
• User-defined holds active flight plan.

3.13.1 Direct To Search Tabs

Search tabs include: Waypoint, FPL, and NRST APT

Direct To Window

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WAYPOINT
Similar to an information page, but with course and hold options. This tab is active
by default.

DATA FIELDS CONTROLS

• Distance and bearing from current • Waypoint Identifier key with
aircraft position access to multiple search tabs
• Applicable city, state, country • Course To key for specifying he
and/or region (e.g., “NW USA”) course angle for the navigation
• Identifier and type icon path
• Hold key for creating, loading,
and activating user-defined holds

FPL & NRST APT

FPL and NRST APT tabs provide a list of selectable identifiers. These tabs have a
uniform layout.
FPL: Lists all waypoints contained in the active flight plan.
NRST APT: Lists up to 25 waypoints within a 200 nm radius. The closest airport
appears at the top of the list.

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3.13.2 Direct To Activation

Activating a direct-to course establishes a point-to-point
line from the aircraft’s present position to the selected
destination. The unit provides course guidance until you
remove the direct-to waypoint, or replace it with a new
direct-to course or flight plan.

Upon activation, Map automatically

opens to show a graphical
representation of the active
direct-to leg.

GPS 175 & GNX 375 GNC 355/355A

GPS NAV Status key changes Direct To key changes to show

to show active leg status. the active direct-to fix. Indication
includes the corresponding fix
symbol and waypoint identifier.
If configured, a user field shows
the active waypoint identifier
and fix type on Map.

GPS 175/GNX 375:

For convenience, you may activate a direct to course using
the control knob. This option is available only when the
Home page is active.
Push the knob once to access the Direct To function.
After selecting a waypoint, push the knob again to
activate the direct-to course.
The window closes and Map opens to show the active leg.

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3.13.3 Navigating Direct To

While most direct-to operations follow the same basic steps, the method for
selecting a waypoint may vary.

DIRECT TO A NEW WAYPOINT

1. Tap Direct To.
2. Select a waypoint identifier.
3. Tap Course and specify the course heading (if a specific course is necessary).
4. Activate the selection.

DIRECT TO A FLIGHT PLAN WAYPOINT

Direct To options are not available for all
Flight Plan Waypoints flight plan entries. Some entries include
If a flight plan exists, waypoint holds and course reversals which are not
sequencing resumes once you selectable using Direct To.
reach the direct-to waypoint. If
1. Tap Direct To.
the waypoint is not in the flight
plan, the flight plan is no longer 2. Select FPL tab.
active but remains available. 3. Select a flight plan leg.
4. Activate the selection.

DIRECT TO THE NEAREST AIRPORT

1. Tap Direct To.
2. Select NRST APT tab.
3. Select an airport.
4. Activate the selection.

DIRECT TO A MAP WAYPOINT

Apply a direct-to course to any location
MAPWPT on the map.
For map locations without an
1. Tap a location on Map.
existing name, Direct To assigns
the “MAPWPT” identifier. 2. Tap Direct To.
Bearing, distance, and map 3. Activate the selection.
coordinates display on the
Waypoint tab.

You can modify direct-to routes on Map using the Graphical Edit function the
same as you would a flight plan.

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DIRECT TO AN OFF-ROUTE COURSE

You may activate an off-route course using any of the described direct-to methods.
Activating an off-route direct-to course automatically deactivates the current leg of
the active flight plan.

Direct To &
Procedure Fixes
Approach guidance is not
available for procedure fixes. An
example would be activating a
direct-to course to a waypoint
between the final approach fix
and missed approach point. Upon
arriving at the waypoint, approach
guidance does not become active.

3.13.4 Removing a Direct-to Course

To cancel the current direct-to course, tap Remove.

Removing a direct-to course:

• Reactivates the original active flight plan
• Assigns the leg nearest to the aircraft’s position as the active leg
• Resumes waypoint sequencing
If no active flight plan exists, the aircraft continues on its current heading without
any navigation guidance.

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3.13.5 User Holds

You may define a holding pattern for any direct to waypoint. User holds suspend
automatic waypoint sequencing until they expire or are removed.

Tapping Hold displays available hold options.

GPS 175 shown as typical.

Load Hold Accept the specified hold parameters and return to the
Direct To window.
Hold Activate Activate the loaded holding pattern.
Course Specify the course angle.
Direction Select between Inbound or Outbound.
Turn Select between Left Turn or Right Turn.
Leg Type Select Time or Distance.
Leg Time Specify the leg time in minutes and seconds (MM:SS).
Leg Distance Specify the leg distance.
EFC Specify a time for the Expect Further Clearance reminder.

Preview View the defined holding pattern as it will appear on Map

and on the Active FPL page.

CREATE & ACTIVATE A HOLD

Create a hold for a direct-to waypoint. From the
Waypoint tab:
1. Tap Hold.
2. Specify hold parameters.
3. Tap Load Hold > Hold Activate.

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Waypoints
There are two types of waypoints: database and user
Database waypoints (i.e., waypoints contained
in the navigation database) are organized into
the following groups.
• Airport (APT)
• Intersection (INT)
• Very High Frequency Omni-directional
Range (VOR)
• Visual Reporting Point (VRP)
• Non-Directional Beacon (NDB)

The Airport page is a great place to start when performing an approach brief,
checking weather, or considering a diversion.

You also have the ability to define any point in space and store it.
Unlike database waypoints, these “user” waypoints are editable.

3.14 Waypoint Information

Dedicated information pages provide waypoint search functions
and details not available on the Map page.

FEATURE REQUIREMENTS
• FIS-B (viewing NOTAMs)
• Navigation database containing VRP waypoint data
FEATURE LIMITATIONS
• 2-D maps provide zoom functionality only
• FIS-B transmits distant and FDC NOTAMs within 100 nm of radio station
position

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Intersection, VOR, VRP, and NDB information pages have a uniform layout.

1 7

2
6

3 5

4
VOR Information Page

1 Waypoint Identifier key 5 Nearest NAVAID information

2 Location Information 6 Waypoint coordinates

3 Preview key 7 Waypoint distance and bearing

Waypoint specific information

4
(e.g., class, station declination, frequency)

COMMON PAGE FEATURES

All waypoint information pages share the following features.

DATA FIELDS CONTROLS

• Distance and bearing from current • Waypoint Identifier key with
aircraft position access to multiple search tabs
• Latitude and longitude • Preview key for displaying a 2-D
• Applicable city, state, country map of the surrounding area
and/or region (e.g., “NW USA”) (includes SafeTaxi airport
• Identifier and type icon depictions)

As you approach an airport, use the Preview function to orient yourself for such
things as pattern entry or runway alignment.

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WAYPOINT SPECIFIC PAGE FEATURES

Features listed here are unique to the corresponding waypoint.

Airport
Selectable abs:
Info: Airport location, elevation, time zone, and fuel
availability.
Procedures: Available approach procedures.
Runways: Identifiers, size, surface type, and traffic pattern
direction.
Tapping Runway opens a list of
available runways.

Frequencies: Available communication and localizer

frequencies. The “c” symbol denotes frequencies that function
as the CTAF.
View additional frequency information by tapping
More Information, if available.
WX Data: Applicable METARs, city forecasts, and TAF weather
information.
NOTAMs: Applicable distant and FDC NOTAMs.
VRPs: Nearest VRPs.

Intersection
Data fields:
• Nearest VOR (identifier, type icon, bearing, and distance)

Very High Frequency Omni-directional Range

Data fields:
• Frequency
• Nearest airport (identifier, type icon, bearing, and distance)
• Station declination
• VOR class

Visual Reporting Point

Data fields:
• Nearest VRP (identifier, type icon, bearing, and distance)

Non-Directional Beacon
Data fields:
• Frequency
• Nearest airport (identifier, type icon, bearing, and distance)
• Marker description

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User Waypoint
Selectable functions:
Edit: Opens the Create User Waypoint page for editing
purposes.
View List: Displays a list of all user waypoint identifiers.
Delete: Removes the selected user waypoint from the list.
Delete All: Removes all user waypoints from the list.
All deletions require user confirmation.
User waypoints in the active flight plan cannot be
edited or deleted.
Data fields:
• Reference position or nearest waypoint (identifier, type icon,
radial, and distance), whichever is applicable
• Number of waypoints used out of 1,000

The User WPT page is the only page that allows you to view an entire list of all
user waypoints created and saved in the database.

3.15 Waypoint Selection

The Waypoint Identifier key provides access to
different waypoint search options. Enter a specific
identifier or select one from the available search tabs.

3.15.1 Waypoint Autofill

Autofilled Alphanumeric characters autofill based on the
Character first alphabetical match in the navigation
database.
Autofill characters are cyan and display from the
cursor position to the right of the field.

Identifier Waypoint
Name Icon

Matching waypoint entries typically change with the addition

of each typed character. An information key reflects each
matching entry.
Info Key

“No matches found” and “Duplicate found” annunciate when applicable.

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3.15.2 Search Tabs

The Find key provides access to multiple search tabs.
Each tab displays a list of selectable identifiers based on specific criteria.

Waypoint Search Tabs

Waypoint
Identifier Type Icon
Each entry includes general
information about the
associated waypoint.

Bearing & Distance

RECENT
Lists up to 20 of the most recently viewed waypoints.

NEAREST
Lists up to 25 waypoints within a 200 nm radius.
Tap Filter and select from the available filter options. Only waypoints
belonging to the selected class appear in the list.

To list all classes,

select All.

FLIGHT PLAN
Lists all waypoints contained in the active flight plan.

USER
Lists up to 1,000 user-defined waypoints.

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SEARCH BY NAME
Lists all airports, NDBs, and
VORs associated with the
specified facility name.
Tap Search Facility Name to
begin search.

SEARCH BY CITY
Lists all airports, NDBs, and
VORs found in proximity of
the city.
Tap Search City Name to
begin search.

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3.16 Create User Waypoints

Create and store up to 1,000 user defined waypoints.

FEATURE LIMITATIONS
• Duplicate user waypoint identifiers are not allowed
• Names may be up to six characters in length
• Comment may be up to 25 characters
• Maximum waypoint limit: 1,000

Access this page from one of two places:

• Waypoint Info page
• Map page

MAP POINTER KEY

Tapping any location on the map that is not a existing
waypoint displays the Create Waypoint access key.

USER WAYPOINT IDENTIFIER

Assign a unique identifier or keep the unit generated
identifier. By default, the identifier format is “USR”
followed by a sequential three digit number.

User waypoints are helpful when ATC requests that you fly one radial to intercept
another. While the point is often defined by an intersection in the navigation
database, this is not always the case. The Create User Waypoint function allows
you to define the new intersection and insert it into the flight plan in advance, as
opposed to using the NAV radio to tune each VOR and specify the radials to fly
inbound and outbound.

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3.16.1 Define Waypoint Criteria

Active user waypoints already existing in a
flight plan are not editable.
When creating a user waypoint, you have
the option to:
• Create a user waypoint
• Assign a unique identifier
• Set the waypoint as temporary
• Enter a comment
• Set the waypoint position
• Edit the waypoint graphically

[1] Waypoint position options are mutually

exclusive. Enabling one disables the other.

User Identifier Assign a unique identifier.

Comment Type a comment regarding the new waypoint.
Position Set the waypoint position.
Open a preview map for graphical editing purposes. User
Graphical Edit waypoint icon remains stationary as you move the
surrounding map to the new location.

Temporary Assign the waypoint a temporary status. Identifier remains

available until the next unit power cycle.
Add the new identifier to the used waypoints list. The
Create associated information page opens automatically for
viewing and editing purposes.

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COMMENT FORMAT
Default comments display in a specific format for each reference type.

LAT/LON Radial/Distance

<LAT> <LON> <Waypoint><Radial> / <Distance>

Radial/Radial

<Waypoint 1><Radial 1> / <Waypoint 2><Radial 2>

POSITION OPTIONS
Set the Waypoint Position using one of the following options.
Radial/Radial:
Specify a waypoint and radial for each of the two reference points.
Radial/Distance:
Specify the reference waypoint, radial, and distance.
LAT/LON:
Specify the point’s latitude and longitude.

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3.16.2 Edit an Existing User Waypoint

FEATURE LIMITATIONS
• User waypoints that are part of a flight plan are not editable

OPEN EDIT WAYPOINT PAGE

You can access the edit function multiple ways.
From the dedicated information page:
Home > Waypoint Info > User WPT > Specify an identifier, or tap View List and
select an identifier from the used waypoints list > Edit
From the Nearest page:
Home > Nearest > User WPT > Select an identifier from the list (e.g., USR001) >
Edit
From the Active FPL page:
Home > Flight Plan > Select the identifier from the flight plan > WPT Info > Edit

MODIFY POSITION VALUES

From the Edit WPT page, you can modify a user waypoint’s position one of two ways:
1. Tap Position > Latitude/Longitude > Specify the waypoint’s coordinates >
Save.
OR
1. Tap Graphical Edit.
2. Hold and drag the basemap until the user waypoint icon appears over the
desired location.
3. Tap Enter > Save.

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3.16.3 Import User Waypoints

FUNCTIONAL LIMITATIONS
• User waypoint file size must not exceed 8 GB

NOTE
The import function overwrites any existing user waypoint of the same
name.

The Import Waypoints key appears when the unit detects a

user waypoint on the datacard.

CREATE USER WAYPOINT FILE

You may create a list of new user waypoints using any spreadsheet program. Read
“User Waypoint File Considerations” for limitations and formatting specifications.
Organize columns as follows.

A B C D
Waypoint Name Comment Latitude Longitude

User Waypoint File

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User Waypoint File Considerations

• Limit one waypoint per row
• Names may be up to six characters in length
• Comments may be up to 25 characters
• All letters must be upper case
• Latitude: two digits left of decimal; up to nine digits right of decimal
• Longitude: three digits left of decimal; up to eight digits right of decimal
• (-) indicates southern latitudes (column C) or western longitudes
• Express latitude and longitude coordinates in decimal degrees

Save the file in the .csv format under the name “user.csv.” Change the file extension
to “.wpt” before copying the file to a blank SD card.

IMPORT USER WAYPOINTS

1. Ensure that the unit power is off.
2. Insert datacard containing user waypoints.
3. Power on unit.
4. From the Home page, tap Waypoint Info > Import Waypoints.
5. Acknowledge the pop-up message.

The import function executes in the background. Once the import is complete, an
advisory message informs: “User waypoints were imported successfully.”
The waypoints are now available for use. You may power down the unit and remove
the SD card.

If an imported waypoint is within 0.0001 degree (latitude and longitude) of an

existing user waypoint, the existing waypoint and name will remain in use.

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3.17 Nearest
View a list of the nearest waypoints, frequencies, or facilities
within 200 nm of the aircraft’s position.

From the Home page:

1. Tap Nearest > Select a waypoint or frequency icon.
2. Scroll through the list of entries.
Information varies according to the selected waypoint or frequency type. Nearest
waypoints provide an identifier key for accessing the associated information page.

Nearest Airport
• Identifier • symbol • distance • bearing • approach type
• length of longest runway

Nearest Intersection
• Identifier • symbol • distance • bearing

Nearest Very High Frequency Omni-directional

Range
• Identifier • symbol • distance • bearing • frequency

Nearest Visual Reporting Point

• Identifier • symbol • distance • bearing

Nearest Non-Directional Beacon

• Identifier • symbol • distance • bearing • frequency

Nearest User Waypoint

• Identifier • symbol • distance • bearing

Nearest Airspace
• Identifier • symbol • proximity

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Nearest Air Route Traffic Control Center

• Facility name • distance • bearing • frequency

Nearest Flight Service Station

• Facility name • distance • bearing • frequency
(“RX” denotes receive-only frequencies)

Nearest Weather Frequency

• Facility name • distance • bearing
• frequency of nearest ATIS, ASOS, and AWOS

ENTRY LIMITS
The number of entries
ENTRY displayed varies according
NEAREST LIST
LIMIT to item type.
ARTCC, FSS 05 Entries are ordered from
Airspace 20 closest to farthest.
Airport, Intersection, VOR, VRP,
25
NDB, User, Weather FREQ

UPDATE INTERVALS
With the exception of nearest airspace, all lists update every 30 seconds. The nearest
airspace list updates once per second.

MULTIPLE FREQUENCIES
This key displays when more than one frequency is
available at the indicated range.
Applicable to functions displaying information only
(ARTCC, FSS, and WX FREQ).

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Procedures
Lateral and vertical guidance is available for visual and GPS/RNAV
approaches. The published instrument approach procedures allow
precision and non-precision approaches to airports and are directly
accessible from the Procedures (PROC) icon.

FEATURE REQUIREMENTS
• Baro-corrected altitude source (automatic sequencing of altitude leg types)
In the absence of baro-corrected altitude data, altitude leg types require manual
sequencing.
FEATURE LIMITATIONS
• The flight plan allows only one procedure to be loaded at a time. Adding a
new procedure overwrites any existing procedure

LOAD A PROCEDURE
Select a procedure type, then define the
criteria for that procedure on the
corresponding setup page.
By default, these keys display underscores.

Upon completion, the specified airport and

procedure appear on the associated key.

When loading a procedure, always remember to check the runway, transition,

and all waypoints.

COMMON PAGE CONTROLS

All procedure pages provide the following setup controls.
Airport: Select an airport for the procedure.
Transition: Select a transition.
Runway: Select a runway for the selected airport.
Preview: View a 2-D map of the surrounding area (includes SafeTaxi airport
depictions).
For page specific controls, refer to the appropriate procedure description.

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3.18 Flight Procedure Basics

NOTE
Advisory climb altitudes for SIDs may not match charted altitudes. Do not
rely solely on advisory altitudes.

• Always check the runway, transition, and waypoints for all procedures.
• Heading legs indicate in white as “HDG XXXº” on flight plans.
• The unit provides lateral and, when appropriate, vertical guidance for visual
and GPS/RNAV approaches.
• Use Map as an aid to situational awareness during ILS, VOR, NDB, and
non-precision localizer-based approaches. A magenta line depicts the active
leg (or the portion of the approach currently in use).
• Always use the appropriate radio navigational aid for primary approach
course guidance during non-GPS approaches.
• Check the annunciator bar for the current phase of flight.
• Many non-precision approaches have GPS overlays, improving accuracy so
that approaches do not require overflying a VOR or NDB.
• The unit guides you through complex overlay approaches, automatically
sequencing each leg up to the missed approach point.
• Fly approaches as published with the full transition using any published
feeder route or initial approach fix, or with a vectors-to-final transition.
• While not required under TSO-C146e, an optional baro-corrected altitude
source is recommended for automatic sequencing of altitude leg types.

When adding procedures to a flight plan:

• Arrange procedures around the existing flight plan as follows:
Departure, En route, Arrival, Approach
• Insert departure waypoints before en route waypoints
• Insert arrival waypoints between en route and approach waypoints
• Always verify that the transition waypoints between each phase are correct

Map complements your printed approach plates by improving situational

awareness during the approach. It does not replace printed approach plates.
Always fly an approach as it appears on the approach plate.

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Roll Steering Autopilots

Roll steering terminates when
approach mode is selected on
the autopilot. It becomes
available once you initiate the
missed approach.

TO/FROM LEGS ON CDI

TO LEGS FROM LEGS
On these legs, the FROM/TO flag on On these legs, the FROM/TO flag on
the CDI indicates “TO” and the the CDI indicates “FROM” and the
Distance field on the flight plan Distance field on the flight plan
decreases as you navigate the leg. increases as you navigate the leg.
Most legs are this type. From legs are typically found on
procedure turns and on some missed
approach procedures.

Composite CDI. When interfaced to a composite

type CDI, the composite CDI flag shows only “TO”
indications. Always refer to the FROM/TO field on
the annunciator bar when using composite CDI.
FROM/TO
Field

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3.18.1 GPS Flight Phase Annunciations

Flight Phase Check the annunciator bar for current phase

(Caution) of flight.
Under normal conditions, these annunciations
are green. They turn yellow when cautionary
conditions exist.

Phase of flight annunciations are a direct indication of the current CDI behavior for
the selected navigation source.
Not all annunciations are available for every navigator.

ANNUNCIATION FLIGHT PHASE

• 0.3 nm CDI scale
0.30 NM
• Based on pilot selection
• 1.0 nm CDI scale
1.00 NM
• Based on pilot selection
Departure
• Terminal level with departure procedure as the active
DPRT navigation
• System using non-precision approach integrity
• CDI full-scale deflection: 0.30 nm
Dead reckoning
DR
• CDI not available
En route
ENR • CDI full-scale deflection: 2.0 nm or current CDI scale
selection, whichever is smaller
Lateral Navigation Approach
LNAV
• Fly to published LNAV minimums
Lateral Navigation Approach with Advisory Vertical
LNAV+V Guidance
• Fly to published LNAV minimums
Lateral and Vertical Navigation Approach
L/VNAV
• Fly to published LNAV/VNAV minimums
Low Altitude
• Aircraft’s estimated height is lower than the final
LOW ALT approach waypoint height by approximately 50 meters
• For LNAV+V, LNAV/VNAV, or LPV approaches
• Not active when Terrain is operational

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ANNUNCIATION FLIGHT PHASE

Localizer Performance Approach
LP
• Fly to published LP minimums
Localizer Performance Approach with Advisory
LP +V Vertical Guidance
• Fly to published LP minimums
Localizer Performance with Vertical Guidance
LPV Approach
• Fly to LPV minimums
Missed Approach
MAPR • System using missed approach integrity
• CDI full-scale deflection: ±0.30 nm
Oceanic
OCN
• CDI full-scale deflection: 2.0 nm
Terminal
TERM • CDI full-scale deflection: 2.0 nm or current CDI scale
selection, whichever is smaller
Visual Approach
• Vertical guidance based on advisory terrain avoidance
VISUAL
calculations
• CDI scaling is identical to LPV approaches

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3.19 Departures
Loading a Departure into Flight Plan
• Always load the departure at the departure airport in the flight plan
• Flight plans allow only one departure procedure at a time
• Loading a departure when one is already present will replace the existing entry
• Selecting a departure, transition waypoint, and runway defines the route

FEATURE LIMITATIONS
• Vector-only departures are not available in the Procedures database

PAGE SPECIFIC CONTROLS

Load Departure: Loads departure
procedure into the active flight plan.
Activate Departure: Activates the
loaded departure procedure.
Remove Departure: Removes the
loaded departure procedure.

SELECT A DEPARTURE
From the Home page:
1. Tap PROC > Departure.
2. Confirm the selected airport. If necessary, tap Airport and choose an airport
using the provided search options.
3. Tap Departure > Select a departure from the list.
4. Tap Transition > Select a transition.
5. Tap Runway > Select a runway.
6. Tap Preview > Review the departure diagram and sequence list.
7. Tap Load Departure. The Active FPL page opens.
8. Scroll the flight plan to view all departure waypoints.

To change or remove the departure:

• Tap the existing flight plan
departure
• Select a different one.
OR
• Tap Remove Departure.

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3.19.1 Flight Plan Departure Options

Selecting a departure on the flight plan opens
a menu. Changes to the active flight plan take
effect immediately.
• Select a new departure
• Remove the selected departure from the
flight plan

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3.20 Arrivals
Loading an Arrival into Flight Plan
• Load a Standard Terminal Arrival (STAR) at any airport with a published
arrival procedure
• Flight plans allow only one arrival procedure at a time
• Loading an arrival when one is already present will replace the existing entry
• Selecting an arrival, transition waypoint, and runway defines the route

PAGE SPECIFIC CONTROLS

Load Arrival: Loads arrival
procedure into the active flight plan.
Activate Arrival: Activates the
loaded arrival procedure.
Remove Arrival: Removes the
loaded arrival procedure.

SELECT AN ARRIVAL
From the Home page:
1. Tap PROC > Arrival.
2. Confirm the selected airport. If necessary, tap Airport and choose an airport
using the provided search options.
3. Tap Arrival > Select an arrival from the list.
4. Tap Transition > Select a transition.
5. Tap Runway > Select a runway.
6. Tap Preview > Review the arrival diagram and sequence list.
7. Tap Load Arrival. The Active FPL page opens.
8. Scroll the flight plan to view all arrival waypoints.

To change or remove the arrival:

• Tap the existing flight plan
arrival.
• Select a different one.
OR
• Tap Remove Arrival.

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3.20.1 Flight Plan Arrival Options

Selecting an arrival on the flight plan opens a menu.
Changes to the active flight plan take effect
immediately.
• Select a new arrival
• Remove the selected arrival from the flight plan

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3.21 Approaches
Loading an Approach into Flight Plan
• Always check the runway, transition, and all waypoints
• Flight plans allow only one approach procedure at a time
• You may load an alternate approach during a missed approach procedure
(flight plan retains all missed approaches)
• Loading an approach when one is already present will replace the existing entry
• Selecting an approach, transition waypoint, and runway defines the route

PAGE SPECIFIC CONTROLS

Load Approach: Loads approach
procedure into the active flight plan.
Activate Approach: Activates the
loaded approach procedure.
Remove Approach: Removes the
loaded approach procedure.
Channel/ID: Loads an SBAS
approach based on the specified
channel.

SELECT AN APPROACH
From the Home page:
1. Tap PROC > Approach.
2. Confirm the selected airport. If necessary, tap Airport and choose an airport
using the provided search options.
3. Tap Approach > Select an approach from the list.
4. Tap Transition > Select a transition.
5. Tap Runway > Select a runway.
6. Tap Preview > Review the approach diagram and sequence list.
7. Tap Load Approach. The Active FPL page opens.
8. Scroll the flight plan to view all approach waypoints.

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To change or remove the approach:

• Tap the existing flight plan
approach.
• Select a different one.
OR
• Tap Remove Approach.

SBAS APPROACHES

To load an SBAS approach:

Channel ID Key
1. Tap Channel/ID.
• Select the channel ID for an
2. Specify an approach channel.
SBAS approach to the current
destination If present, both channel and ID load
automatically.
• Provides an alternate means
of loading an approach.
• IDs are available from an
approved approach chart
• In the case of duplicate
numbers, select an approach
from the provided list

SUSPENDED APPROACH PROCEDURE ANNUNCIATION

“SUSP” indicates that automatic sequencing of approach waypoints is suspended on
the active leg. This annunciation appears in the procedure field of the annunciator
bar.
Suspended approaches typically occur during:
• Holding patterns
• Crossing the missed approach point
• Climb to altitude legs
• Hold to altitude legs

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PROCEDURE TURNS
A procedure turn is stored as another
Roll Steering & approach leg. It does not require any
Procedure Turns special operations other than flying
The steering provided for a the procedure itself.
procedure turn does not guarantee Roll steering is available for aircraft
that the aircraft will with a compatible autopilot.
stay within the charted procedure
turn boundaries. Always be sure
to fly within the confines of the
charted procedure.

3.21.1 Flight Plan Approach Options

Selecting an approach on the flight plan
opens a menu. Changes to the active flight
plan take effect immediately.
• Activate the selected approach
• Activate vectors to final for the
selected approach
• Activate a missed approach
• Select a new approach
• Remove the selected approach from
the flight plan

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3.21.2 Missed Approach

The method for activating a missed approach depends on your position in relation to
the missed approach point.

BEFORE MISSED APPROACH POINT

Select Activate Missed Approach. This function is available in two locations.
Active FPL:
Home > Flight Plan > Select the approach > Activate Missed Approach
OR
Procedures:
Home > Procedures > Activate Missed Approach
Once selected, guidance continues along an extension of the final approach course
(i.e., final approach fix to missed approach point).
The unit automatically sequences to the first leg of the missed approach. This allows
you to execute the missed approach prior to reaching the missed approach point.

AFTER MISSED APPROACH POINT

Upon reaching the missed approach point, a pop-up presents two options.
To continue with sequencing
suspended, tap Remain Suspended.
To receive guidance to the missed
approach hold point, tap
Activate GPS Missed Approach.

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3.21.3 Approach Hold

Selecting an approach hold on the flight plan opens a
menu. Changes to the active flight plan take effect
immediately.
• Activate the selected hold
• Insert a waypoint after the hold
• Edit hold details
• Exit the holding pattern before the timer expires
• Remove the selected hold from the flight plan

ACTIVATE HOLD
1. Select the hold.
2. Tap Activate Hold.
3. Confirm the request.

REMOVE HOLDING PATTERN

1. Select the hold.
2. Tap Remove.
3. Confirm the request.

EXIT HOLDING PATTERN

1. Tap SUSP.
2. Select the hold.
3. Tap Exit Hold.
4. Confirm the request.

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NON-REQUIRED HOLDING PATTERNS

Upon activating an RNP GPS
approach, decide whether to skip
non-required holding patterns during
the initial transitions of the approach.
A pop-up presents two options.

Selecting Yes adds the hold to the

flight plan.
Preview shows the hold in white.

Selecting No means the hold is not

included in the flight plan.
Preview shows the hold in gray.

Timer/Distance field displays on the active flight plan (refer here when flying the
outbound portion of the holding pattern). Holding pattern appears on Map with the
active flight plan leg indication.

CROSSING MISSED APPROACH POINT

When crossing the missed approach point:
• “SUSP” annunciation indicates that approach waypoint sequencing is
suspended at the missed approach point
• FROM/TO flag on the CDI indicates “From” for non-composite CDIs
• FROM/TO field on the annunciator bar indicates “FR”
• Course guidance continues along the final approach course

If you need to go around the holding pattern again to lose extra altitude or
speed, tap SUSP to manually suspend waypoint sequencing before crossing the
holding waypoint the second time.
If you have already passed the waypoint, re-activate the holding pattern.

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3.21.4 DME Arc

The unit supports approaches

DME Arc Approaches containing DME arcs.
• Left/right guidance relative to To manually activate DME Arc, the
the arc aircraft must be within the shaded
• Manual arc leg activation area.
once aircraft is near the arc

DME Arc

Intermediate Initial
Approach Approach
Fix Fix

X
1/2 X

Arcing Fix (VOR)

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3.21.5 RF Legs
The unit supports radius-to-fix (RF)
AC 90-101A - RF Legs legs associated with RNAV RNP 1.0
AC 90-101A defines RF leg as non-AR approaches, when approved by
“A constant radius circular path, the installation.
around a defined turn center, that Flying a radius-to-fix approach is similar
starts and terminates at a fix. An to flying a DME arc approach (status
RF leg may be published as part of indications are identical).
a procedure.”
Unlike DME arcs, however, RF legs are
not based on a VOR. They may have
varying radii, making them larger or
smaller than arc legs.

For details regarding RF legs for specific aircraft, consult the AFMS.

3.21.6 Vectors to Final

Activating the approach with vectors to final displays an
extension of the final approach course on Map.

Magenta depicts the active leg of

the flight plan.

CDI needle remains off center until you are established on

the final approach course. As a reminder, “vtf” annunciates
as part of the active leg on the GPS Nav status key.

Activating vectors-to-final while on the From side of the final approach fix
suspends automatic waypoint sequencing. “SUSP” annunciates at the bottom of
the screen. Sequencing resumes once the aircraft is on the To side of the final
approach fix and within full-scale deflection.

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3.21.7 ILS Approach

NOTE
ILS and LOC approaches are not approved for GPS. GPS guidance is for
monitoring purposes only.

Selecting an ILS or LOC approach

results in a pop-up message.
Activate the approach or select a
different one.

Do not attempt to use the unit as the primary navigation source during ILS approach.

3.21.8 RNAV Approaches

Fly RNAV approaches according to

Always fly to the published the published chart.
minimums for:
• LNAV/VNAV
• LNAV
• LNAV+V
• LPV
• LP
• LP+V

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LNAV APPROACH
RNAV non-precision lateral navigation approach.

LNAV+V APPROACH
RNAV non-precision LNAV approach with advisory vertical guidance.
The glidepath is a light dashed line on the vertical profile (Jeppesen charts only) with
an associated glidepath angle (usually in the 3.00 degree range) to assist in
maintaining a constant vertical glidepath, similar to an ILS glideslope.
CDI Full-scale Deflection

1.0 nm

0.3 nm

350 ft
Angle
set by
2.0 nm system

FAF

CDI scale varies when VTF is active.

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LPV APPROACH
Localizer performance with vertical guidance. Similar to flying the standard ILS
approach.
This segment describes a typical LPV approach sequence and the necessary pilot
actions.
Within 31 nm of destination:
• Mode switches from En Route to Terminal
• CDI scale transitions from 2.0 nm to 1.0 nm, full-scale deflection
Approaching initial approach fix:
• Waypoint message annunciates
• Time to Turn advisory annunciates and 10 second timer counts down as the
distance approaches zero
Approaching final approach fix:
• Mode switches from Terminal to LPV
2.0 nm from final approach fix:
• CDI scaling tightens from 1 nm to the approach-defined angular full-scale
deflection
60 seconds before final approach fix:
• System verifies GPS position integrity is within approach limits
CDI Full-scale Deflection

1.0 nm

0.3 nm
Course
Width

Angle
based on
2.0 nm database
info
FAF Landing
Threshold

CDI scale varies when VTF is active.

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If GPS integrity exceeds the horizontal and/or vertical alarm limits:

• Approach downgrades to non-precision
• “LNAV” annunciates on Map to inform of the change if there are LNAV
minimums for the approach
• Advisory message: ”GPS approach downgraded. Use LNAV minima.”
• Glideslope indication disappears
• Pilot continues approach using LNAV non-precision minimums, if applicable
If GPS integrity does not meet the non-precision horizontal alarm limits:
• Advisory message: “Abort Approach. GPS approach is no longer available.”
• Pilot acknowledges message
• Unit reverts to terminal limits of 1 nm to support navigation to the missed
approach

After the aircraft passes final approach fix:

• Approach aborts due to a loss of WAAS integrity
• Pilot captures the glideslope (method is same as for ILS glideslope)
When crossing the final approach fix:
• Waypoint sequences to the missed approach point
(e.g., RW31, the runway threshold)
• Pilot flies toward missed approach point, keeping the needle on the external
CDI (or HSI) at center, and observing published altitude minimums
• Final course segment becomes the active flight plan leg on Map
Approaching missed approach point:
• Advisory message: “Arriving at Waypoint.”
Crossing missed approach point:
• Sequencing suspends
• Pop-up message: “Missed Approach Waypoint Reached”
• Pilot decides whether to remain suspended or activate the missed approach

• Tapping Remain Suspended allows you to continue with sequencing

suspended
• Tapping Activate GPS Missed Approach allows you to continue with
guidance to the missed approach hold point
Prepare aircraft for missed approach operation:
• Pilot taps UNSUSP (sequences missed approach), then follows the unit
provided guidance to the missed approach hold point and holds

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LP APPROACH
Points About LP Approaches
• Use SBAS accuracy, making them similar to an LNAV approach but more precise
• Combine the lateral accuracy of an LPV approach with the angular scaling of a
localizer approach
• Often contain step-down altitudes
• Always result in a minimum descent altitude and missed approach point

This segment describes a typical LP approach sequence and the necessary pilot
actions.
Within 30 nm of destination:
• Mode switches from En Route to Terminal
• CDI scale transitions from 2.0 nm to 1.0 nm, full-scale deflection
Approaching initial approach fix:
• Turn direction message annunciates
• Time to Turn advisory annunciates and 10 second timer counts down as the
distance approaches zero
Approaching final approach fix:
• Unit begins to automatically rescale in an angular fashion, allowing you to fly
as you would a standard localizer approach
2.0 nm from final approach fix:
• CDI scaling tightens from 2 degrees or 0.3 nm full-scale deflection,
whichever is smaller
60 seconds before final approach fix:
• System verifies GPS position integrity is within the horizontal limits to
complete the LP non-precision approach

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If pilot exceeds the horizontal alarm limits:

• Approach downgrades to non-precision
• “LNAV” annunciates on Map to inform of the change
• Advisory message: “GPS approach downgraded. Use LNAV minima.”
• Pilot continues approach using LNAV non-precision minimums, if applicable
If GPS integrity does not meet the non-precision horizontal alarm limits:
• Advisory message: “Abort Approach. GPS approach is no longer available.”
• Pilot acknowledges message
• Unit reverts to terminal limits of 1 nm to support navigation to the missed
approach

If the approach indicates “LP+V,” then advisory vertical guidance may be

removed without annunciation. This is due to the vertical guidance not being
within tolerances.
This does not constitute a downgrade. You may still fly the approach to LP
minimums.

When crossing the final approach fix:

• Waypoint sequences to the missed approach point
(e.g., RW31, the runway threshold)
• Pilot flies toward missed approach point, keeping the needle on the external
CDI (or HSI) at center, observing published altitude minimums
• Final course segment becomes the active flight plan leg on Map
Approaching missed approach point:
• Advisory message: “Arriving at Waypoint.”
At the missed approach point:
• Pilot initiates missed approach, if necessary

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Crossing missed approach point:

• Sequencing suspends
• Pop-up message: “Missed Approach Waypoint Reached”
• Pilot decides whether to remain suspended or activate the missed approach

• Tapping Remain Suspended allows you to continue with sequencing

suspended
• Tapping Activate GPS Missed Approach allows you to continue with
guidance to the missed approach hold point
Prepare aircraft for missed approach operation:
• Pilot taps UNSUSP (sequences missed approach)
NOTE: For missed approaches with heading legs, fly manually until you reach the
first active course leg.
• Pilot follows the unit provided guidance to the missed approach hold point
and holds

LP+V
Flying an LP approach with
advisory vertical guidance (LP+V)
does not change how the
approach should be flown. The
pilot is still responsible for
descending to the correct altitude
at each step down.
The result is still an MDA and
missed approach point.

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3.21.9 Visual Approach

Points About Visual Approaches
• Provide advisory horizontal and optional vertical guidance for the selected
runway
• Lateral guidance is always provided for visual approaches
• Helps stabilize the runway approach
• Three methods for loading and activation

FEATURE REQUIREMENTS
• Valid terrain database
FEATURE LIMITATIONS
• Not all airports in the database support visual approaches
• Only external CDI/VDI displays provide vertical deviation indications
Published data is used to determine the visual approach GPA and threshold crossing
height (TCH) for the selected runway. If no published data is available, the default is
3 degrees GPA and 50 ft TCH.
You may load and activate a visual approach from the following apps.
• Map • Procedures • Waypoint Info

Upon loading the visual approach,

a pop-up informs when vertical
guidance is available.
If available, the pop-up contains
the glidepath angle (GPA) and
threshold crossing (TCH).

If unavailable, it reads: “NO VERTICAL GUIDANCE”

Terrain and obstacle obstructions along the approach path determine the availability
of vertical guidance advisories for visual approaches.
• If no known obstructions are within the approach path, vertical guidance is
provided to a maximum distance of 28 nm from the runway.
• If there are known obstructions further than 3 nm, but within the 28 nm
maximum distance from the runway along the approach, vertical guidance
is limited to the approach path after crossing the known obstructions. After
loading the approach, a shortened magenta line shows on the map.
If obstructions are within 3 nm to the runway, along the approach path, advisory
vertical guidance is not available.

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LOAD A VISUAL APPROACH FROM MAP

When the aircraft is within 10 nm of the destination airport, the Visual Approach
selector key becomes active. This key may appear in one of two places:
On the map or at the left of the screen if the supporting airport is selected.
1. Select the airport icon.
2. Tap Visual.
3. Select from the list of available visual approaches.
Once selected, the visual approach immediately loads and activates.

For more about Visual Approach key configuration, refer to section 3.1.4.

LOAD A VISUAL APPROACH FROM PROCEDURES

Two methods:
Home > PROC > Approach
OR
Home > Waypoint Info > Airport > PROC > Select an approach (similar to
published instrument approaches)

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3.21.10 Autopilot Outputs

CAUTION
ENGAGE THE AUTOPILOT HEADING MODE AND SET THE HEADING BUG
APPROPRIATELY TO USE THE AUTOPILOT ON HEADING LEGS USING THE
AUTOPILOT’S NAV, GPSS, OR APR MODE. NOT ALL AUTOPILOTS FOLLOW
GUIDANCE ON THESE LEG TYPES, SOME REVERT TO A ROLL ONLY OR WINGS
LEVEL MODE.

FEATURE REQUIREMENTS
• Availability dependent upon configuration
FEATURE LIMITATIONS
• Applicable to King KAP 140 and KFC 225 autopilots
Outputs for the King KAP 10/KFC 225 autopilot units require manual activation.
If configured, this function prompts you to enable autopilot outputs during the
approach procedure.

GNX 375 shown as typical.

Enable APR Output Advisory

Once enabled, the unit provides guidance information consistent with what the
autopilot expects (i.e., angular CDI scaling and glideslope capture for LPV or other
vertically guided GPS approaches).

ENABLE AUTOPILOT OUTPUTS

1. Acknowledge the advisory message.
2. Tap Enable APR Output.
3. Follow the unit provided guidance.

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4 Planning
VERTICAL CALCULATOR
4.1 VCALC Page ..........................................................................................4-3
4.2 VCALC Setup ........................................................................................4-4
FUEL PLANNING
4.3 Fuel Planning Page ................................................................................4-5
DALT/TAS/WIND CALCULATOR
4.4 DALT/TAS/Wind Page ............................................................................4-8
RAIM PREDICTION
4.5 RAIM Prediction Page ..........................................................................4-11

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PLANNING
APPS & FUNCTIONS

This section describes features that make flight planning easier and
more efficient.
Planning apps and setup functions reside in the system Utilities.

[1] Point-to-Point mode only.

[2] Flight Plan mode only.
[3] From key not selectable when Present Position (P.POS) function is active.
[4] Function not selectable when sensor data in use.
[5] Indicates pressure altitude when sensor data in use.

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 Planning

Vertical Calculator
Calculate time to TOD and vertical speed required to reach target
altitude at the specified location.

WARNING
DO NOT RELY ON VCALC MESSAGES AS THE ONLY MEANS OF EITHER
AVOIDING TERRAIN/OBSTACLES OR FOLLOWING ATC GUIDANCE. VCALC
PROVIDES ADVISORY INFORMATION ONLY AND MUST BE USED IN CONCERT
WITH ALL OTHER AVAILABLE NAVIGATION DATA SOURCES.

FEATURE LIMITATIONS
This feature is inhibited when:
• Groundspeed is < 35 knots
• No active flight plan or direct-to destination is available
• One of the following modes is active: SUSP, Vectors-to-Final, OBS
• Navigating to a waypoint after the FAF

4.1 VCALC Page

The Vertical Calculator (VCALC) feature is helpful when
you want to descend to a certain altitude near an
airport.

Create a 3-D profile to guide you from your present position and altitude to a final
(target) altitude at a specified location. Once defined, you may configure message
alerts and additional data on the Map page to stay informed of your progress.

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Target ALT • Specify the final (target) altitude for the course
• Altitude reference used for VCALC calculations
Altitude Type • Toggles between “MSL” and “Above WPT”
• Above WPT is available for airports only
VS Profile • Specify the vertical speed value
• Distance value representing the geographical location at the
Offset target altitude
• Distance is measured from the target waypoint
• Indicates whether the offset distance defines a point before
or after reaching the target waypoint
Before/After
• “After” indication not available for the last destination in
flight plan
• Reference location specified in the flight plan or active
direct-to that will be used for planning a descent
Target
• When using a flight plan, the target waypoint is a reference
Waypoint
that can be specified from the waypoints in the flight plan
• Last waypoint in the flight plan is the default target setting

STATUS
VCALC status messages display here.

VS REQUIRED
Displays the vertical speed required to reach the target altitude at the specified
offset.

4.2 VCALC Setup

Tap Menu to access controls for:
• Restoring default page settings
• Displaying VCALC related advisory messages

RESTORE DEFAULTS
Resets VCALC page settings to their default values. Excludes Target Waypoint.

DISPLAY MESSAGES
Allows VCALC related advisory messages to display on the Messages page.

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Fuel Planning
View fuel conditions along any flight plan (active or programmed)
or between two waypoints (including the active direct-to).

4.3 Fuel Planning Page

The fuel planning feature computes fuel
conditions based on route, ground speed,
fuel on board, and fuel flow.

4.3.1 Fuel Planning Modes

Tapping Mode toggles the active fuel planning mode between
Point to Point and Flight Plan. Point to Point is the default mode
setting.

POINT-TO-POINT MODE FLIGHT PLAN MODE

Calculate fuel between two Calculate fuel for a specific flight plan
waypoints in the database, or leg, or for the cumulative
between the aircraft’s present flight plan.
position and a selected waypoint.

Use the mode specific controls to define the flight path (leg or route). Required input
values are dependent upon mode selection.
Fuel on board, fuel flow, and ground speed data are required independent of mode
selection.

For Planning Purposes Only

• Fuel on Board and Fuel Flow are pilot specified values. They are not a direct
indication of actual aircraft fuel on board or fuel flow.
• Fuel Required to <destination> is a calculated prediction based on pilot
specified values. It is not a direct indication of actual fuel quantity once the
aircraft reaches its destination.
• All data entries on this page are used exclusively by the Fuel Planning app.
• Fuel computations are for planning purposes only.

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MODE SELECTION DESCRIPTION

• Enters the current aircraft coordinates as the
departure location (or From waypoint)
P. Position
• Aircraft latitude and longitude fields replace
the From waypoint key
Point-to-
• Specify a waypoint from the database as the
Point
From departure location (or From waypoint)
• Not available when P. Position is active
• Specify a waypoint from the database as the
To
destination (or To waypoint)
• Opens a list of available flight plans
• Options include the active flight plan or one
Flight Plan from the catalog
Flight • Defaults to the active flight plan if no
Plan selection is made
• Options dependent on flight plan selection
Leg • Defaults to cumulative leg option if no
selection is made
• Specify the amount of fuel on board (gallons)
Fuel on Board • This amount decreases once per second
based on specified fuel flow value
• Specify the current fuel flow rate
Fuel Flow
(gallons per hour)
Use Sensor • Utilize current GPS ground speed data
Data
• Behavior based on state of Use Sensor Data
Both Use Sensor Data key inactive:
• Function selectable
• Specify ground speed

Ground Speed Use Sensor Data key active:

• Function not selectable
• Displays current GPS ground speed when the
Use Sensor Data key is active
• This value is used to calculate fuel statistics
when you press the Compute key

Adjust fuel on board and fuel flow values as necessary to account for changes in
performance.

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4.3.2 Computing Fuel Statistics

Compute and display fuel data based on the selected fuel
planning mode and specified input values.

Statistics for the selected leg or

route display on a dedicated
data page. This information is
for planning purposes only.
Tap Next or Prev to view
statistics for other legs in the
flight plan (if applicable).

Statistics include:

• Fuel required for leg • Fuel after leg

• Reserve after leg • Range
• Efficiency • Endurance

COMPUTE FUEL STATISTICS

1. Select a fuel planning mode.
2. Define a leg or route.
• If “Flight Plan” is set, select the flight plan and leg. Selecting the active
flight plan sets the starting waypoint at the aircraft’s current position.
• If “Point to Point” is set, select From and To waypoints, or use the
aircraft’s current position as the From waypoint.
3. Specify the amount of fuel on board and average fuel flow rate.
4. Specify ground speed or elect to use sensor data.
5. Tap Compute.

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DALT/TAS/Wind Calculator
Calculate density altitude, true airspeed, and winds.

FEATURE REQUIREMENTS
• Fuel/air data computer (pressure altitude)
• Valid sensor data

4.4 DALT/TAS/Wind Page

This feature indicates the theoretical altitude
at which the aircraft performs based on
several input variables.

4.4.1 Editing Input Data

Available selections are dependent on sensor data use. TAT and HDG may also be
available via an external data source.

Not Selectable

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• Specify indicated altitude value [1] [2]

Indicated ALT • Use +/- keys to indicate above or below sea level
• Mutually exclusive with Pressure ALT
BARO • Specify barometric pressure value [3]
CAS • Specify calibrated air speed value [2]
• Specify true air temperature
TAT
• Use +/- keys to indicate above or below 0º
HDG • Specify heading value
TRK • Specify track angle value [2]
• Inputs reference values
(internal or received from air data computer)
Use Sensor
• Replaces indicated altitude with pressure altitude
Data
received from fuel/air data computer
• Excludes TAT and HDG
Ground Speed • Specify ground speed [2]

[1] Toggles to Pressure ALT indication when sensor data in use.

[2] Not selectable when sensor data in use.
[3] This field is absent when sensor data is in use.

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4.4.2 Computing DALT/TAS/Wind Statistics

Compute and display density altitude and current wind
conditions. Calculations are based on current input values.

Statistics display on a dedicated

data page. This information is
for planning purposes only.
Dashes indicate when input
values are invalid.

DENSITY ALTITUDE WIND DATA

• Pressure altitude corrected for • Wind direction and speed
nonstandard temperature • Headwind
• Units display in increments of ten • Tailwind
• True air speed

Density altitude and true airspeed calculations are dependent on indicated altitude, barometric pressure,
and total air temperature.
Wind data calculations are dependent on true airspeed, aircraft heading, and ground speed.
Wind direction is dependent on the NAV Angle system unit setting.
If wind speed is zero, wind direction displays as dashes.

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RAIM Prediction
Determine GPS coverage availability for the current location or a
specified waypoint at any time and date. RAIM performs checks to
ensure the navigator has adequate satellite geometry during flight.

NOTE
RAIM availability prediction is for use in areas where WAAS coverage is not
available. It is not required in areas where WAAS coverage is available.

FEATURE REQUIREMENTS
• Active flight plan and off-route direct-to waypoint (arrival date and time)
FEATURE LIMITATIONS
FAA’s TSO requirements for non-precision approaches specify significantly greater
satellite coverage than is required during other phases of flight. As a result, RAIM
may not be available for all approaches.
RAIM prediction results are valid for up to 90 days from the current date. Arrival
dates beyond 90 days, or in the past, may not provide accurate results.
This feature predicts the availability of fault detection integrity. It cannot predict the
availability of LPV or L/VNAV approaches.

Use a non-GPS based approach when RAIM is not available. To determine WAAS
availability, including for LPV approaches, visit the FAA’s NOTAM service.

4.5 RAIM Prediction Page

The RAIM feature can help you plan for a
pending flight by confirming GPS operation
before an approach.

RAIM Features
• Automatically monitors RAIM during approach operations and warns when
RAIM is not available
• Near 100% availability in Oceanic, En route, and Terminal phases of flight
• Waypoint Identifier, Arrival Date, and Arrival Time setup keys
• Compute RAIM key

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4.5.1 Calculating RAIM Status

Calculate RAIM availability for the specified waypoint, date,
and time. Prediction results annunciate once the calculation is
complete.

WAYPOINT SEARCH OPTIONS

A Waypoint Identifier key allows you to specify a destination airport using multiple
search options.

ARRIVAL DATE & TIME

These setup controls allow you to set the expected date and time of arrival at the
specified airport. Values default to the current date and time in the absence of an
active flight plan and off-route direct-to waypoint.

CHECK RAIM AVAILABILITY

1. Specify a destination waypoint.
2. Specify the expected arrival date and time.
3. Tap Compute RAIM.

4.5.2 RAIM Status Indications

Dashes indicate when the destination waypoint is invalid.

ANNUNCIATION DESCRIPTION
Computing Status is pending.
RAIM Available RAIM is available at the specified waypoint.
RAIM Unavailable RAIM is not available at the specified waypoint.

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5 Hazard Awareness
WEATHER AWARENESS
5.1 Data Transmission Limitations ................................................................5-3
5.2 FIS-B Weather Display ............................................................................5-5
5.3 FIS-B Weather Setup ..............................................................................5-6
5.4 FIS-B Weather Interactions .....................................................................5-7
5.5 FIS-B Weather Products..........................................................................5-8
5.6 Raw Text Reports.................................................................................5-16
5.7 FIS-B Ground Reception Status.............................................................5-18
TRAFFIC AWARENESS
5.8 Traffic Applications ..............................................................................5-19
5.9 Traffic Display ......................................................................................5-21
5.10 Traffic Setup ........................................................................................5-25
5.11 Traffic Interactions ...............................................................................5-27
5.12 Traffic Annunciations...........................................................................5-28
5.13 Traffic Alerting.....................................................................................5-29
TERRAIN AWARENESS
5.14 Terrain Configurations .........................................................................5-31
5.15 Database Limitations............................................................................5-33
5.16 Terrain Display .....................................................................................5-34
5.17 Terrain Setup .......................................................................................5-35
5.18 Terrain Proximity..................................................................................5-36
5.19 Terrain Alerting ...................................................................................5-39

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HAZARD AWARENESS
APPS & FUNCTIONS

Menu selections vary based on features and optional equipment installed with
Garmin avionics.

[1] GPS 175/GNC 355: Feature availability dependent upon unit configuration. Requires external
ADS-B In product (GDL 88, GTX 345) and FIS-B.

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Weather Awareness
WARNING
DO NOT RELY SOLELY ON DATALINK WEATHER FOR WEATHER INFORMATION.
DATALINK WEATHER PROVIDES A SNAPSHOT IN TIME. IT MAY NOT ACCURATELY
REFLECT THE CURRENT WEATHER SITUATION.

NOTE
Datalink weather is not intended to replace weather briefings or in-flight
weather reports from AFSS or ATC.

FEATURE REQUIREMENTS
• GPS 175/GNC 355 with UAT receiver (GDL 88, GTX 345) and FIS-B
OR
• GNX 375 and FIS-B
The FAA provides FIS-B as a Surveillance and Broadcast Service operating on the UAT
(978 MHz) frequency band. FIS-B uses a network of FAA-operated ground-based
transceivers to transmit weather datalink information to the aircraft’s receiver on a
scheduled continuous basis.

The Flight Information Service-Broadcast (FIS-B) Weather service is freely available

for aircraft equipped with a capable datalink universal access transceiver (UAT).
Ground stations provide uninterrupted services for the majority of the contiguous
U.S., Hawaii, Guam, Puerto Rico, and parts of Alaska. No weather subscription
service is required. For the latest FAA ground station coverage information, visit:
www.faa.gov/nextgen/programs/adsb/

5.1 Data Transmission Limitations

FIS-B broadcasts provide weather data in a repeating cycle which may take several
minutes to completely transmit all available weather data. Therefore, not all weather
data may be immediately present upon initial FIS-B signal acquisition.

5.1.1 Line of Sight Reception

To receive FIS-B weather information, the aircraft’s datalink receiver must be within
range and line-of-sight of an operating ground-based transceiver. Reception may be
affected by altitude, terrain, and other factors. Per the FAA, much of the United
States has FIS-B In airborne coverage at and above 3,000 feet AGL. Terminal
coverage is available at altitudes below 3,000 feet AGL and is available when flying
near approximately 235 major U.S. airports. Surface coverage allows FIS-B ground
reception at approximately 36 major U.S. airports.

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5.1.2 Per FAA TSO-C157b

FIS-B information may be used for pilot planning decisions focused on updating the
pilot's awareness of the dynamic flight environment; including avoiding areas of
inclement weather that are beyond visual range and pilot near-term decisions where
poor visibility precludes visual acquisition of inclement weather. FIS-B weather and
NAS status information may be used as follows:
a. To promote pilot awareness of ownship location with respect to reported
weather, including hazardous meteorological conditions; NAS status indicators
to enhance pilot planning decisions; and pilot near-term decision-making.
b. To cue the pilot to communicate with Air Traffic Control, Flight Service Station
specialist, operator dispatch, or airline operations control center for general and
mission critical meteorological information, NAS status conditions, or both.
FIS-B information, including weather information, NOTAMs, and TFR areas, are
intended for the sole purpose of assisting in long-/near-term planning and
decision making. The system lacks sufficient resolution and updating capability
necessary for aerial maneuvering associated with immediate decisions. In
extreme scenarios, the oldest weather radar data on the display can be up to
15 to 20 minutes older than the display’s age indication for that weather radar
data. Therefore, do not attempt to use FIS-B weather information to maneuver
the aircraft at minimum safe distances from hazardous weather.
FIS-B information must not be used in lieu of a standard preflight briefing.
c. FIS-B uplink is a subscription-free FIS broadcast managed by FAA SBS. It provides
an FAA approved source for METAR, TAF, WINDS, PIREPs, NEXRAD, AIRMET,
SIGMET, and TFR information, and is subject to the broadcast range limits for
these products.
FIS-B uplink is not an FAA approved source for NOTAMs.

5.1.3 NOTAM 30-Day Limitation

NOTAMs received via FIS-B may not be a complete listing. Active NOTAMs are
removed from the FIS-B data stream 30 days after issuance. Before flight, review all
necessary aeronautical and meteorological information from official sources.

For more information, consult AC 00-63A or latest revision.

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5.2 FIS-B Weather Display

FIS-B weather data displays on the dedicated weather page and as
overlays on Map. No pilot action is required to receive FIS-B weather
information.

3 7
4

5
6

FIS-B WX Page

Aircraft Symbol
Depicts current aircraft position and orientation.
1 • Tip represents actual aircraft location
• Symbol type is dependent upon configuration
• Absent if a GPS source is not available

North Indicator
2
Indicates True north.

Page Orientation Label

• North Up orients page to True north
3 • Track Up orients page to current aircraft GPS track
• Heading Up orients page to current aircraft heading
(requires heading data source interface)

Basemap
4
Presents a graphical depiction of land and water data.

NEXRAD Controls
5 Includes source key and animation control. Source options include
CONUS, Regional, or Combined.

Zoom Scale
6
Value adjusts with changes to the current magnification.

Product Timestamp
7
Approximate time of data collection for each active weather product.

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5.3 FIS-B Weather Setup

Tap Menu to access weather setup
options. This page also provides access
to the FIS-B Status page, where
controls for enabling/disabling the
FIS-B function, viewing raw text
reports, and checking ground
reception status reside.

Map WX Overlays
Overlay controls reside in the Map
setup menu.
Home > Map > Menu > Select from
NEXRAD, METAR, and TFR.

FIS-B WEATHER ENABLED

To mitigate any possibility of the avionics receiving unexpected

data formats in the FIS broadcast, you may disable FIS-B Weather
by toggling the FIS-B Enabled key to off.
This key is active by default. It is not intended for use under
normal broadcast conditions.

From the setup menu, tap FIS-B WX Status > FIS-B Enabled.
This function is also accessible from the ADS-B Status page:
Home > System > ADS-B Status > FIS-B WX Status > FIS-B Enabled

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5.4 FIS-B Weather Interactions

WX INFO BANNER
Tapping any weather icon displays an information banner. When applicable,
a pop-up window displays additional data.

WX Info Banner
Banner Information:
• Pan mode symbol
• Bearing and distance to map
pointer from aircraft’s
current position

LEGENDS
A scrollable legend provides relevant product colors and symbols. Definitions are
organized by product function.

1. Tap Menu > Legend.

2. Use the inner knob to
view the available
product legends.

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5.5 FIS-B Weather Products

When available, FIS-B weather products display as follows.

WEATHER DISPLAY
FIS-B WEATHER WX RAW
PRODUCT FIS-B MAP APT
POP-UP TEXT
WX PAGE PAGE INFO
TEXT REPORT

AIRMET

METAR w/Decoding

NEXRAD

NOTAM-D

NOTAM-FDC

PIREP

SIGMET

TAF

Temps Aloft

TFR

Winds Aloft

Product Present

5.5.1 Product Status

View the status of all FIS-B weather
products. States include:
• Unavailable
• Awaiting Data
• Data Available

From the FIS-B menu, tap FIS-B WX Status.

This page is also accessible from the ADS-B Status page.

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5.5.2 Product Age

NOTE
Data contained within a composite weather product may be olderthan its
weather product age and should never be considered current.

A timestamp identifies the approximate time of data collection for each weather
product. For quick reference, the age of each active weather product is calculated
and shown in a color-coded side bar on the FIS-B Weather page.

TIMESTAMP COLOR DEFINITIONS

Yellow
Weather product considered stale. Its age is older than
half its expiration time.
A weather product may be amber when its issue date and
time occurs in the future by more than the complete
expiration time for the requested weather product
(e.g., some TFRs).
Green
Weather product considered current. Its age is newer than
half its expiration time.
Tapping timestamp window displays the time for all green
colored weather products.
Gray
Weather product data is one of the following:
• Expired
• Not received
• Not supported at the selected altitude
“No Data” or “ALT UNAVBL” displays next to the weather
product title.

FIS-B weather product update and transmission intervals are published in the
SBS Description Document associated with TSO-C157b. This information is
available electronically at the FAA’s Regulatory and Guidance Library:
https://rgl.faa.gov/

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5.5.3 FIS-B NEXRAD

WARNING
NEVER USE NEXRAD WEATHER FOR MANEUVERING IN, NEAR, OR AROUND
AREAS OF HAZARDOUS WEATHER. NEXRAD IMAGES ARE SNAPSHOTS OF PAST
WEATHER DATA. THEY ARE NOT SAFE FOR USE AS REAL TIME DEPICTIONS OF
NEARBY WEATHER ACTIVITY.

CONUS NEXRAD Regional NEXRAD

NEXRAD weather radar displays a mosaic of precipitation data, colored according to

reflectivity. Composite reflectivity images depict the highest radar energy received
from multiple antenna tilt angles at various altitudes. Base reflectivity images depict
radar returns from the lowest antenna tilt angle. Per AC 00-63A, FIS-B CONUS and
Regional NEXRAD are composite reflectivity images.
The precipitation intensity level reflected by each pixel represents the highest level of
composite radar reflectivity data sampled in that location.

A clear understanding of ground-based Doppler weather radar capabilities will

allow you to interpret the NEXRAD weather imagery in the safest way possible.
The National Oceanic and Atmospheric Administration hosts a description of the
technology on its website: https://www.weather.gov/jetstream/doppler_intro

RADAR DATA ANIMATIONS

To depict trending weather movements over time, an animation
function stitches the last three to six received radar images together
in sequence, from oldest to newest, and replays them on a
continuous loop.
Play and stop controls are active when three or more NEXRAD images
are available for playback.

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CONUS & REGIONAL NEXRAD

FIS-B NEXRAD is uplinked to the aircraft as two separate weather products:
CONUS and Regional NEXRAD. Both products display individually or simultaneously,
separated by a white hash-marked boundary, based on source selection.

Depending on the locations of

Regional Regional CONUS
Echo Block Boundary Echo Block received FIS-B ground stations,
Regional NEXRAD coverage
can extend as far as 250 nm
around an aircraft’s position.
Aircraft flying at higher
altitudes typically receive data
from more ground stations
than aircraft flying at low
altitudes.
FIS-B NEXRAD does not
differentiate between liquid
CONUS & Regional NEXRAD and frozen precipitation types.
Combined
Source options are selectable from the weather setup menu or the NEXRAD key at
the bottom left of the FIS-B Weather page. The key label changes to reflect the active
source.

CONUS Regional Combined

• Large, low-resolution weather image for the entire

continental U.S.
CONUS
• Pixels are 7.5 min (7.5 nm = 13.89 km) wide by 5 min
(5 nm = 9.26 km) wide
• High-resolution weather image with limited range, centered
around each broadcasting ground station
• Pixels are 1.5 min (1.5 nm = 2.78 km) wide by 1 min
Regional
(1 nm = 1.852 km) tall
• Each weather pixel varies with latitude. Above 60º latitude,
pixel block width doubles to 3 min/nm for regional maps
• Both CONUS and Regional NEXRAD images display
Combined simultaneously
• White hash mark indicates regional boundary

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5.5.4 METARs and TAFs

METAR and TAF reports provide information on current and forecast conditions.
Colored METAR flags display when a METAR reporting station is matched with a
corresponding navigation database identifier.
When selected, the METAR is decoded and displayed above the original METAR text.
METARs are provided only in areas covered by the navigation database currently
loaded.

METAR SYMBOLS
VFR
Ceiling greater than 3000 ft AGL and visibility greater than five miles.

Marginal VFR
Ceiling 1000 to 3000 ft AGL and/or visibility three to five miles.

IFR
Ceiling 500 to 1000 ft AGL and/or visibility one to three miles.
Low IFR
Ceiling below 500 ft AGL and/or visibility less than one mile.

Unknown
Ceiling and/or visibility data unavailable.

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5.5.5 AIRMETs
The AIRMET overlay draws the geographical boundaries of received AIRMETS on the
dedicated weather page. AIRMETS include advisories of weather that may be
particularly hazardous to single engine, light aircraft and VFR pilots.
Tapping an AIRMET opens a detailed report.

AIRMET TYPES
Icing • Areas of moderate airframe icing including areal extent
Turbulence • Areas of moderate turbulence including vertical extent
• Weather conditions with ceilings <1,000 ft and/or
IFR
visibility <3 mi
• Widespread mountain obscuration due to clouds,
MTN OBSR
precipitation, smoke, haze, mist, or fog
• Sustained surface winds >30 kt and/or potential
Surface Winds
non-convective wind shear below 2,000 ft AGL

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5.5.6 SIGMETs
The SIGMET overlay draws the geographical boundaries of received SIGMETs on the
dedicated weather page. Convective and non-convective SIGnificant METerological
Information combine in a textual report and display graphically for the observed or
forecast region.
Tapping a SIGMET opens a detailed report.

5.5.7 PIREPs
PIREPs are pilot-generated weather reports that may contain non-forecast adverse
weather conditions, such as low in-flight visibility, icing conditions, wind shear, and
turbulence.

PIREP SYMBOLS
Routine (UA) PIREPs are issued as either Routine (UA) or
Urgent (UUA). Tapping a PIREP symbol displays
Urgent (UUA) textual details.

Route

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5.5.8 Winds/Temps Aloft

Indicates wind speed and direction,
and temperature forecast for the
specified altitude.
Altitude range: surface to 45,000 ft
The wind barb extends outward from
the reporting location dot in the
direction of wind origination.

Plus and minus keys adjust altitude for altitude-based

weather products.

Not all altitudes provide winds/temps aloft forecasts for all regions.

5.5.9 TFRs

WARNING
DO NOT EXCLUSIVELY USE DATALINK SERVICES FOR TFR INFORMATION. TFR
DEPICTIONS MAY NOT BE A COMPLETE LISTING AND MAY VARY BETWEEN
COCKPIT DEVICES. ALWAYS CONFIRM TFR INFORMATION WITH OFFICIAL
SOURCES SUCH AS FLIGHT SERVICE STATIONS OR AIR TRAFFIC CONTROL.

TFRs identify areas of airspace where aircraft are temporarily restricted from
operating. They are routinely issued for occurrences such as dignitary visits, military
activities, and forest fires.
Tapping a TFR displays textual details.

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5.6 Raw Text Reports

View raw textual data for a FIS-B
product.
1. Open the FIS-B WX Status
page.
2. Tap Raw Text Reports.
3. Select a weather product.

The latest uploaded

data for the product
displays on a
dedicated page.

Multiple reporting
stations appear in a
list. Tapping View
displays raw text for
the corresponding
identifier.

To view information
about products not
available due to a
service outage, select
Unavailable Products.

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READING WINDS/TEMPS ALOFT REPORTS

Tapping Winds/Temps Aloft displays a forecast of winds and temperatures for
different altitudes. Temperature forecasts are not included for altitudes below
2,500 ft AGL.
On the raw text report, altitude values do not align with the corresponding forecast.
Match the color of the altitude and forecast to interpret the information.
Color markings are for reference only.

ALTITUDE (FT)

3,000 6,000 9,000 12,000 18,000 24,000 30,000 34,000 39,000

2118 2327+0 2526-02 2628-07 2633-08 2533-29 274245 284756 286265

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5.7 FIS-B Ground Reception Status

FEATURE REQUIREMENTS
• UAT transceiver (powered)
• FIS-B Enabled function active

Monitor FIS-B ground station transmission status from the

FIS-B Reception page. A current report lists completeness of
NOTAM-TFR, AIRMET, and SIGMET data for all received
ground stations.

For the received ground station, the

station range field indicates
complete/incomplete status only for
those products within the ground
station’s range.
1. Open the FIS-B WX Status page.
2. Tap Radio Stations.

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Traffic Awareness
FEATURE REQUIREMENTS
• GPS 175/GNC 355 with External ADS-B In product (GDL 88, GTX 345)
OR
• GNX 375
FEATURE LIMITATIONS
• Available functions and alerting features are dependent upon the ADS-B
traffic system source

ADS-B Features
• Runway and taxiway depiction during SURF mode
(< 2 nm range scale)
• Selectable traffic icons display intruder and vector information
• Customizable motion vectors (type, duration)

5.8 Traffic Applications

FEATURE REQUIREMENTS
• Aviation database (SURF only)
FEATURE LIMITATIONS
• ATAS does not alert to traffic on ground
ADS-B In traffic support three applications:
AIRB: Basic Airborne Application
ATAS: ADS-B Traffic Advisory System
SURF: Surface Situation Awareness

AIRB is considered the fundamental airborne traffic application. ATAS provides

alerts when airborne traffic trajectories pose a potential collision risk.
SURF provides additional situational awareness when you are on ground or
within the terminal environment.

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TRAFFIC APPLICATIONS
• Both active when ADS-B is “On”
(airborne traffic indications are available; ATAS arms to
provide airborne alerts)
• Alerts occur when potential collision risks are determined
based on current airborne position and trajectory and the
AIRB & ATAS position and trajectories of other airborne traffic
• Airborne traffic alerts only
(no alerts on ground or for traffic on the ground)
• Nominally allow 20 to 40 seconds for flight crew response
• Provide aural alerting when traffic alerts occur
• Active on ground or within the terminal environment
(<5 nm and <1,500 ft above field elevation)
• Traffic on ground may display when SURF is active
SURF • Runway and taxiway depictions when the zoom scale is
<2 nm (Traffic page only)
• Depicts only traffic and ground vehicles equipped with
ADS-B Out

5.8.1 Traffic Application Failures

During normal operation, the “ADS: On” status annunciation means that both AIRB
and ATAS applications are active. In the rare event of an application failure, it is
possible that only one of the applications may be active. The unit provides indications
to reflect which application is no longer operational.
• ADS field indicates “On”
• If AIRB is active and ATAS is failed, the unit displays the system message:
“ADS-B traffic alerting function inoperative”
• If AIRB is failed and ATAS is active (and still capable of providing a no-bearing
aural alert), “Unavailable” annunciates across the traffic display

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5.9 Traffic Display

Collision avoidance and traffic surveillance data display on the
dedicated Traffic page and as overlays on Map.
The Traffic page displays intruding traffic in relation to the current
position and altitude of the aircraft without clutter from other data.
1

9
3
4, 5, 6

7
8

Traffic Page

Ownship Icon
Depicts current aircraft position.
1 • Nose of the ownship is the actual ownship location
• Unlike the configured aircraft symbol on map displays, ownship icon
is always a directional arrow

ADS-B Status & Active Applications

• ADS-B indications:
• On means the AIRB and ATAS traffic applications are active
• Off means that air and ground applications are inactive
• Test means the traffic test function is active
2
• Fail means that ADS-B reports a failure
• Ground station transmitter status icon
• +SURF means that ground targets displays in addition to
airborne targets
• Altitude filter setting (NORM, ABV, BLW, UNR)

Page Orientation Label

• Track Up orients page to current aircraft GPS track
3
• Heading Up orients page to current aircraft heading
(requires heading data source interface)

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Intruding Aircraft Symbol

Actual intruder location varies according to symbol type.
4
• Tip of directional symbols
• Center of non-directional symbols
Altitude Separation Value
Indicates when an intruder is above or below the ownship.
• Value appears above or below the traffic symbol, depending on
5
relative altitude
• Plus or minus sign denotes higher or lower altitude in hundreds
of feet

Vertical Trend Arrow

6 Active when an intruder is climbing or descending at a vertical speed
greater than 500 fpm.

Selected Vector Type and Duration

7 Types: Absolute and Relative
For more about motion vectors, read section 5.10.1.

Range Ring
8 • Outer ring represents selected range
• Range options vary according to traffic application

Selected Traffic Information Window & Next Key

9 Select and view aircraft information for multiple traffic symbols.
For more about traffic interactions, read section 5.10.

GROUND STATION TRANSMITTER STATUS ICON

TIS-B ground station transmitter is Traffic picture may be incomplete in

providing a traffic picture specific to the vicinity of the ownship. A partial
the ownship aircraft. traffic picture may be available due to:
• aircraft-to-aircraft ADS-B and/or
• traffic pictures from the ground
station customized for other
nearby aircraft

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TRAFFIC UNITS
Traffic units are always uniform.
PARAMETER UNITS
Selections on the System Units page do
Altitude ft
not affect the traffic display.
Distance nm

ADS-B TRAFFIC SYMBOLS

Traffic Information is for advisory use only. The pilot is responsible for identifying and
avoiding traffic conflict.

Basic Directional Proximate Directional

Basic Non-directional Proximate Non-directional

Basic Off-scale Proximate Off-scale

Selected Selected

Directional
Non-directional Alerted
(On-Ground)

Non-directional Off-scale Non-directional

(On-Ground) Alerted Traffic

Proximate Directional
Directional Alerted Traffic
(On-Ground)

Proximate
Off-scale Directional
Non-directional
Alerted Traffic
(On-Ground)
Directional Surface Non-directional Surface
Vehicle Vehicle

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TRAFFIC GROUPS
When the Traffic Grouping function is active, traffic within close proximity of each
other may display as a group.
• Asterisk indicates that the target belongs to a group
• Relative proximity of the closest target determines color
• Depiction is of the most immediate threat

OFF SCALE TRAFFIC ALERTS

Off scale (out of range) traffic alerts are depicted as half yellow
symbols on the outermost range ring at the correct bearing.

TRAFFIC OVERLAY STATUS ICON (MAP ONLY)

This icon appears on Map when the traffic overlay is active. It is
absent when the overlay function is off.

Map Traffic Overlay

An “X” appears over the icon when the overlay is on but unavailable.

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5.10 Traffic Setup

Tap Menu to access pilot selectable

settings as well as the self-test and ADS-B
display functions.

Map Traffic Overlay

The overlay control resides in the
Map setup menu.
Home > Map > Menu > Select
Traffic.

Enable AIRB/ATAS. Depending on the state of the aircraft,

ADS-B Display the system may additionally select SURF.
Selecting Off disables the ADS-B In function.
Initiate a test of the traffic system. A test pattern displays on
Test the page. System returns to normal operating mode once
the test is complete. [1]
Select motion vector type. Selecting Off removes all motion
Motion Vector vectors from the display.
Options: • Absolute • Relative • Off
Select the amount of time represented by the endpoint.
Vector Duration Options range from 30 seconds to 5 minutes.
A longer duration results in a longer vector.

Altitude Filter Select filter range.

Options: • Normal • Above • Below • Unrestricted
Show targets in close proximity as a group. When active, the
Traffic Grouping highest priority target is displayed. Asterisk indicates one or
more targets are decluttered by grouping.

[1] Available only when aircraft is on ground (i.e., standby mode) and ADS-B Display is off.

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5.10.1 Motion Vectors

FEATURE LIMITATIONS
• Motion vectors display on the Traffic page only
A motion vector is a line extending from the nose of an intruder icon. Its orientation
represents the intruder’s direction and movement.
A yellow vector indicates when traffic meets intruding TA criteria (i.e., closing rate,
distance, vertical separation).

MOTION VECTOR TYPES

• White vector
• Depicts intruder ground track
• Calculations based on intruder direction and ground speed
Absolute
• Endpoint depicts intruder’s position over the ground at the
end of the selected duration
• Airborne and ground functionality
• Green vector
• Depicts intruder movement relative to the ownship
• Calculations based on track and ground speed of both
intruder and ownship
Relative • Endpoint depicts intruder’s location relative to the ownship
at the end of the selected duration
• Airborne functionality only
• “Relative Motion - Unavailable” annunciates during
ground operations

5.10.2 Altitude Filtering

Pilot selectable filters limit the display of traffic to a specific altitude range relative to
the altitude of the ownship.
Filter selections apply to both the Traffic page and the traffic overlay on Map.

SELECTION LABEL ALTITUDE RANGE

Normal NORM -2,700 ft to 2,700 ft
Above ABV -2,700 ft to 9,900 ft
Below BLW -9,900 ft to 2,700 ft
Unrestricted UNR -9,900 ft to 9,900 ft

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5.11 Traffic Interactions

Selecting a traffic symbol displays information
Selected Traffic about the aircraft in the upper right corner of
Information the page.
• Registration/call sign Selections remain active through altitude
• Vehicle type filtering, zoom scale, and page changes.
• Closure rate
• Track
• Ground speed

Tapping Next repeatedly steps through multiple symbols spaced

closely together.

Selected
Traffic

Selected
Traffic
Info

Next Key

When a traffic alert occurs, the Mute Alert option temporarily

replaces the Next key.

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5.12 Traffic Annunciations

ANNUNCIATION DESCRIPTION
Absolute Motion - XX Active motion vector type is absolute and vector time
SEC/MIN is XX seconds/minutes.
Failed ADS data failure.
No Data Unit is not receiving valid traffic data.
No GPS Position ADS-B LRU detects that GPS is initializing.
Relative Motion - XX
Active motion vector type is relative.
SEC/MIN
Relative Motion - Aircraft is not airborne and the active motion vector
UNAVAILABLE type is relative.
Unavailable Necessary traffic data not available.

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5.13 Traffic Alerting

Traffic alerts occur anytime there is an
Traffic Alert Types
increase in the number of traffic
• Textual annunciations at the advisories. They remain active until the
bottom of the screen area is clear of all TAs.
• Color-coded target icons on
Traffic page
• Pop-up window when
another page is active

FEATURE LIMITATIONS
• Aural traffic alerts available on GNX 375 only
• Mute alert function is applicable only to the active aural alert
(does not mute future alerts)

Traffic Pop-up Traffic Alert Annunciation

ALERT TYPE | POP-UP | CONDITION |

ANNUNCIATION
VOICE MESSAGE
Alert Type: Caution
Pop-up Alert: Yes
Condition:
TRAFFIC • Traffic reports a traffic advisory
Voice Message:
• Message content depends on current traffic
system configuration

To silence the active traffic alert voice message, tap Mute Alert.

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ALERTING PARAMETERS

Alerting Parameter Traffic alerting parameters consider

several factors in order to allow you
Considerations enough time to acquire the target and
• Altitude separation and trend maneuver the aircraft away from
• Angle conflicting traffic.
• Speed To minimize nuisance alerts, traffic
alerting sensitivity is adaptive, based on
• Closure rate of each aircraft
altitude above ground level. No aural
(ownship and target) alerts are given below 500 ft.

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 Hazard Awareness

Terrain Awareness
WARNING
DO NOT USE TERRAIN AND OBSTACLE DATA TO NAVIGATE OR MANEUVER
AROUND TERRAIN. THEY ARE AN AID TO SITUATIONAL AWARENESS ONLY.

FEATURE REQUIREMENTS
All terrain functions require the following components to operate properly.
• Valid 3-D GPS position for terrain and obstacle data display
• Valid terrain/obstacle database
FEATURE LIMITATIONS
• Alerting functions are dependent upon the configured terrain alerting
options
• Terrain Alerting functions do not provide aural alerts

5.14 Terrain Configurations

Terrain Proximity displays relative
Available Terrain Modes elevations on moving map depictions
• Terrain Proximity (Terrain page, Map). It does not
• Terrain Alerting (FLTA/PDA) provide visual alerts.

Terrain Alerting adds Forward Looking Terrain Alert (FLTA) and Premature Descent
Alert (PDA) functions. These include visual alerts when the aircraft flies below an
alerting threshold.

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Hazard Awareness

5.14.1 GPS Altitude for Terrain

FUNCTIONAL REQUIREMENTS
GPS altitude is derived from satellite measurements. To acquire an accurate 3-D fix
(latitude, longitude, altitude), a minimum of four operating satellites must be in view
of the GPS receiver antenna.
The terrain system uses GPS altitude and position data to:
• Create a 2-D image of surrounding terrain and obstacles relative to the
aircraft’s position and altitude
• Calculate the aircraft’s flight path in relation to surrounding terrain and
obstacles
• Predict hazardous terrain conditions and issue alerts

GSL ALTITUDE & INDICATED ALTITUDE

The unit converts GPS altitude data to GSL altitude (i.e., the geometric altitude
relative to MSL) for use in terrain functions. All Terrain page depictions and elevation
indications are in GSL.
Variations between GSL altitude and the aircraft’s corrected barometric altitude (or
indicated altitude) are common. As a result, Terrain page altitude data may differ
from current altimeter readings. Both GSL altitude and indicated altitude represent
height above MSL, but differ in accuracy and reliability.

GSL ALTITUDE INDICATED ALTITUDE

• Highly accurate and reliable • Barometric altitude source
geometric altitude source corrected for pressure variations
• Does not require local altimeter • Requires frequent altimeter
settings to determine height setting adjustment to determine
above MSL height above MSL
• Not subject to pressure and • Subject to local atmospheric
temperature variations conditions
• Affected primarily by satellite • Affected by variations in pressure,
geometry temperature, and lapse rate

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 Hazard Awareness

5.15 Database Limitations

NOTE
Garmin cross-validates terrain and obstacle data in accordance with
TSO-C151c. However, the information should never be considered
all-inclusive. Database inaccuracies or omissions may exist.

Terrain and obstacle data are not available when the aircraft is operating outside of
the installed database coverage area.
Garmin obtains terrain and obstacle data from government sources and cannot
independently verify the accuracy and completeness of the information. Pilots must
familiarize themselves with the appropriate charts and other data for safe flight.
DATABASE LIMITATION
• Not available north of 89º N latitude and south of
Terrain
89º S latitude
• Coverage areas vary according to database type
• Power line indications for the contiguous United States and
small parts of Canada and Mexico
Obstacle • Regional definitions may change without notice
• May not contain uncharted obstacles
• May include power lines or only HOT lines depending on
database type [1]

[1] HOT lines are power lines that share location with other obstacles identified by the FAA.

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Hazard Awareness

5.16 Terrain Display

Terrain, obstacle, and wire data display as overlays on the
dedicated Terrain page and as overlays on Map.

2
3
4
1
5

6
Terrain Page

Ownship Icon
1
Depicts current aircraft position.

GSL Altitude
2
Displays current GPS height above mean sea level.

North Indicator
3
Indicates True north.

Page Orientation Label

• Track Up orients page to current aircraft GPS track
• Heading Up orients page to current aircraft heading
4
(requires heading data source interface)
Heading Up takes priority over Track Up when both orientation inputs
are available.

Legend
5 Shows color designations for terrain and obstacle relative altitude
ranges.

Terrain Overlay Icon

6
Indicates power line or obstacle presence at the current zoom scale.

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 Hazard Awareness

AUTOMATIC ZOOM

In the event an alert occurs, the page

automatically zooms to provide the best
depiction of that alerted terrain, obstacle,
or power line.

AUTOMATIC DATA REMOVAL

Automatic removal of obstacle and power line data
occurs at range scales greater than 10 nm.

5.17 Terrain Setup

Tap Menu to access pilot selectable
settings as well as self-test and alert
inhibit functions.

Map Terrain Overlays

Overlay controls reside in the Map
setup menu.
Home > Map > Menu > Select from
Terrain and OBST/Wires.

• Inhibits visual alerts for terrain, obstacles, and power

Terrain Inhibit
lines
• 360 changes view format to a 360º ring encircling the
View aircraft (default view)
• Arc changes view format to a forward-looking 120º arc
• Toggles the active flight plan overlay on or off
Flight Plan
(Terrain page only)
Legend • Toggles the Terrain and Obstacle/Wire legend on or off

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Hazard Awareness

5.18 Terrain Proximity

FEATURE LIMITATIONS
• Terrain and obstacle depictions are relative to aircraft altitude.
• Obstacle depictions are dependent upon database
• Does not provide visual or aural alerts
View color depictions of terrain and obstacle elevations relative to your current
position and altitude.

Terrain Proximity Features

• Non-TSO C151c certified terrain display system
• 2-D graphical representation of surrounding terrain, obstacles, and power lines
relative to aircraft position and altitude
• Declutter automatically removes obstacle and power line data at large ranges
• Continuous monitoring of database validity, GPS and hardware status
• Displays when higher level terrain functions are active

5.18.1 Terrain Elevation Depictions

Color shading depicts terrain elevations relative to the aircraft’s position and altitude.
Colors automatically adjust as the aircraft’s altitude changes.

1
2

Terrain Shading

1 Red 2 Yellow 3 Black

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 Hazard Awareness

5.18.2 Obstacle Elevation Depictions

FEATURE LIMITATIONS
• Obstacles more than 2,000 ft below current altitude do not display

TOWER OBSTACLES
UNLIGHTED LIGHTED
OBSTACLE OBSTACLE
OBSTACLE LOCATION
<1000’ >1000’ <1000’ >1000’
AGL AGL AGL AGL

Red obstacle is above or within 100 ft

below current altitude.

Yellow obstacle is between 100 ft and

1000 ft below current altitude.

White obstacle is between 1,000 ft and

2,000 ft below current altitude.

WIND TURBINE OBSTACLES

UNLIGHTED LIGHTED
WIND WIND
OBSTACLE LOCATION
TURBINE TURBINE
OBSTACLE OBSTACLE

Red obstacle is above or within 100 ft

below current altitude.

Yellow obstacle is between 100 ft and

1,000 ft below current altitude.

White obstacle is more than 1,000 ft below

current altitude.

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Hazard Awareness

POWER LINE OBSTACLES

OBSTACLE POWER LINE OBSTACLE LOCATION

Red power line is above or within 100 ft below current

altitude.

Yellow power line is between 100 ft and 1,000 ft below

current altitude.

White power line is between 1,000 ft and 2,000 ft below

current altitude.

OBSTACLE GROUPS
An asterisk indicates when the obstacle database contains only a single
latitude and longitude for a group of obstacles. This occurrence is rare.

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 Hazard Awareness

5.19 Terrain Alerting

Receive visual alerts for potential flight path conflicts involving terrain, obstacles, or
power lines. Alerting behavior is determined at installation.

Terrain Alerting Features

• Non-TSO C151c certified terrain alerting system
• FLTA functions: RTC, RLC, ROC, ITI, ILI, and IOI
• Premature Descent alerts
• Terrain depictions and display overlays
• Cautions and warnings indicate alert severity and threat type
• Textual annunciations
• Pop-up alerts
• Threat location indication on Terrain page and Map
• Self-test and alert inhibit functionality

5.19.1 Alert Types

Available alerting functions depend on the installed terrain system.
ALERT TYPE CONDITION

Imminent Impact Aircraft reaches the minimum clearance altitude of any

[1] obstacle (IOI), terrain (ITI), or power line (ILI) in the
projected flight path.

Reduced Aircraft’s vertical flight path is projected to be within the

Clearance [1] minimum clearance altitude of an obstacle (ROC), terrain
(RTC), or power line (RLC).
Aircraft is significantly below the normal approach path
Premature for the nearest runway.
Descent [2] • Altitude is <700 ft above terrain
• Distance from destination airport is 15 nm or less

[1] Alerting inhibited <200 ft AGL within 0.5 nm of approach runway or <125 ft AGL within 1.0
nm of runway threshold.
[2] Alerting inhibited within 0.5 nm of approach runway or <125 ft AGL within 1.0 nm of runway
threshold. Alerting thresholds for final descent are based on current position, speed, and flight
path data.

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Hazard Awareness

5.19.2 Alerting Thresholds

MINIMUM CLEARANCE ALTITUDE
FLIGHT PHASE
LEVEL FLIGHT DESCENDING
En Route 700 ft 500 ft
Terminal 350 ft 300 ft
Approach 150 ft 100 ft
Departure 100 ft 100 ft

PDA THRESHOLD
Height Above Terrain (ft)

Runway
Threshold Distance from Destination Airport (nm)

Alerting Area

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 Hazard Awareness

5.19.3 Inhibiting FLTA & PDA Alerts

NOTE
Always use discretion when inhibiting FLTA or PDA alerts. Re-activate the
alert function when appropriate.

The Terrain Inhibit control is accessible via the

terrain pop-up alert or Terrain page menu.
Runway surface and minimum length settings
impact the terrain alerting criteria when
Inhibit Mode considering potential runways.
Annunciation

INHIBITS FUNCTION
Manually inhibits FLTA or PDA visual alerts for low altitude
INHIBIT
approaches.
Automatically inhibits FLTA alerts when the aircraft meets the
following approach criteria.
AUTOMATIC • Altitude <200 ft above runway elevation
INHIBIT
• Position <0.5 nm off approach end or between each
runway end

Tapping Terrain Inhibit generates a

pop-up. Confirm the request to inhibit
terrain alerts.

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Hazard Awareness

5.19.4 FLTA & PDA Alerts

Terrain Alert Types

• Textual annunciations at the
bottom of the screen
• Color-coded graphics on
Terrain page and Map
• Pop-up window when
another page is active

Terrain Pop-up Terrain Alert Annunciation

ANNUNCIATION ALERT TYPE | POP-UP | CONDITION

Alert Type: Caution
Pop-up Alert: N/A
TER FAIL Condition:
• Terrain reports a system failure
• The database is missing or corrupt
Alert Type: Advisory
Pop-up Alert: N/A
TER INHB
Condition:
• Terrain reports alert inhibit mode active
Alert Type: Caution
Pop-up Alert: N/A
Condition:
TER N/A
• No GPS position
• Degraded GPS signal
• Aircraft is outside of the terrain database
regional coverage

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 Hazard Awareness

ANNUNCIATION ALERT TYPE | POP-UP | CONDITION

Alert Type: Caution
Pop-up Alert: Yes
TERRAIN Condition:
• Reduced Required Terrain Clearance
• Imminent Terrain Impact
• Premature Descent
Alert Type: Advisory
Pop-up Alert: N/A
TER TEST
Condition:
• Terrain system test is in progress
Alert Type: Caution
Pop-up Alert: Yes
OBSTACLE Condition:
• Reduced Obstacle Clearance
• Imminent Obstacle Impact
Alert Type: Warning
Pop-up Alert: Yes
Condition:
• Reduced Required Terrain Clearance
PULL UP • Imminent Terrain Impact
• Reduced Obstacle Clearance
• Imminent Obstacle Impact
• Reduced Line Clearance
• Imminent Line Impact
Alert Type: Caution
Pop-up Alert: Yes
WIRE Condition:
• Reduced Line Clearance
• Imminent Line Impact

190-02488-01 Rev. A Pilot’s Guide 5-43

 INTENTIONALLY LEFT BLANK

5-44 Pilot’s Guide 190-02488-01 Rev. A

 Messages

6 Messages
ADVISORY MESSAGES
6.1 Message Key .........................................................................................6-2
6.2 Airspace Advisories ................................................................................6-2
6.3 Database Advisories...............................................................................6-3
6.4 Flight Plan Advisories .............................................................................6-4
6.5 GPS/WAAS Advisories............................................................................6-6
6.6 Navigation Advisories.............................................................................6-8
6.7 Pilot Specified Advisories........................................................................6-9
6.8 System Hardware Advisories ................................................................6-10
6.9 Terrain Advisories ................................................................................6-15
6.10 Traffic System Advisories......................................................................6-16
6.11 VCALC Advisories ................................................................................6-19
6.12 Waypoint Advisories ............................................................................6-19

190-02488-01 Rev. A Pilot’s Guide 6-1

Messages

Advisory Messages
Advisories are system-related messages relative to the display.

• Most recent advisories appear at the

top of list
• View-once advisories remain in
queue until viewed by the pilot
• Persistent (or conditional) advisories
remain active until the indicated
condition is resolved

All advisories are logged in the unit’s internal storage. This log may be exported to an
SD card.

6.1 Message Key

This key displays at the left edge of the screen when an advisory
condition is present. Tapping the key once displays an advisory list.
Tapping it again acknowledges all active advisories and closes the list.
• Flashes when a new advisory is present
• Turns solid once all active advisories are acknowledged
• No longer displays after all active advisories are cleared

6.2 Airspace Advisories

Alerted airspace types are based on pilot settings in the Airspace Alerts page.
These advisories are informational only. No action is necessary.

ADVISORY CONDITION
AIRSPACE ALERT - Inside
Aircraft is inside the airspace.
airspace.
AIRSPACE ALERT - Airspace
Airspace is within 4nm of the path and
within 4 nm and entry in less
projected to enter in less than 10 minutes.
than 10 minutes.
AIRSPACE ALERT - Airspace Aircraft is projected to enter the airspace in less
entry in less than 10 minutes. than 10 minutes.
AIRSPACE ALERT - Within Airspace is less than 4 nm from the aircraft. May
4 nm of airspace. not be projected to enter the airspace.

6-2 Pilot’s Guide 190-02488-01 Rev. A

 Messages

6.3 Database Advisories

ADVISORY CONDITION CORRECTIVE ACTION
<Terrain/Obstacle> Re-download and install the
The indicated database
database not indicated database. Contact a
is unavailable or corrupt.
available. Garmin dealer for support.
Terrain database cannot
Terrain display provide elevation at the Load appropriate coverage
unavailable for current GPS position. area onto the external
current location. Aircraft is outside the datacard.
database coverage area.
Navigation database
Verify user-modified
updates and the stored
procedures in Verify the procedures are
flight plan contains
stored flight plans correct.
user-modified
are correct.
procedures.
The stored flight plan
Verify airways in contains an airway that Verify all airways are correct.
stored flight plan is inconsistent with the If necessary, reload airways to
are correct. current navigation the stored flight plan routes.
database.
Database update causes Verify cataloged flight plan
A procedure has
flight plan to exceed and procedures are correct. If
been modified in a
100 waypoint limit. necessary, reload procedures
cataloged flight
Procedure is removed or to the stored flight plan
plan.
truncated as a result. routes.
Magnetic variation
flagged as unreliable in
Aircraft in area with the MagVar database.
Verify that the geographical
large mag var. Typically occurs when
region supports navigation
Verify all course operating at high
based on magnetic variation.
angles. latitudes that do not
support a magnetic
NAV angle.

190-02488-01 Rev. A Pilot’s Guide 6-3

Messages

6.4 Flight Plan Advisories

ADVISORY CONDITION CORRECTIVE ACTION
Unit unable to decode Check for proper operation
flight plan contents. of all necessary
Flight plan import
Wireless import of the components. If the problem
failed.
requested flight plan not persists, contact dealer for
possible. service.
The flight plan catalog is
Flight plan import Delete any unnecessary
full. Wireless import of the
failed. Catalog is flight plans from the
requested flight plan not
full. catalog.
possible.
Unit receives the specified
<#> new imported
number of flight plans via
flight plan(s)
the import function. They No action necessary.
available for
are available for viewing
preview.
on the Preview page.
Verify all stored cataloged
flight plans and procedures.
Stored flight plan Current navigation
Modify stored flight plans
waypoint is not in database no longer
as necessary to include
current navigation contains a stored flight
waypoints that are in the
database. plan waypoint.
current navigation
database.
Verify stored cataloged
flight plans and procedures.
A waypoint in a stored
Stored flight plan Modify stored flight plans
flight plan moved by more
waypoint has as necessary to include
than 0.33 arc minutes
changed location. waypoints that are in the
from its previous position.
current navigation
database.
The flight plan contains an
acute course change
ahead. Following the
Steep turn. Aircraft
guidance requires a bank Slowing the aircraft may
may overshoot
in excess of normal. If shallow the turn.
course during turn.
coupled, the autopilot may
not be able to execute the
steep turn.

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 Messages

ADVISORY CONDITION CORRECTIVE ACTION

Unit receives a flight plan Enable the External FPL
Changes to active from G3X Touch, but the Crossfill function.
route are disabled. External FPL Crossfill Home > System > Setup >
function is off. External FPL Crossfill.
GDU disconnected.
Communication with the Verify that the GDU is on.
External flight plan
G3X Touch is lost. Contact dealer for service.
crossfill inoperative.

190-02488-01 Rev. A Pilot’s Guide 6-5

Messages

6.5 GPS/WAAS Advisories

ADVISORY CONDITION CORRECTIVE ACTION
<Unit> GPS receiver Use a different GPS receiver
Internal communication
has failed. Check or a non-GPS based source of
to the WAAS board is
GPS coax for navigation. Contact dealer
inoperative.
electrical short. for service.
Ensure the aircraft is clear of
GPS loss of integrity hangars, buildings, trees, etc.
GPS/WAAS board
(LOI). Verify GPS Use a different GPS receiver
reports LOI. Antenna
position with other or a non-GPS based source of
may be shaded from
navigation navigation. If the problem
satellites.
equipment. persists, contact dealer for
service.
Wait for GPS satellite
geometry to improve. Ensure
GPS navigation lost
the aircraft has a clear view
due to insufficient GPS position lost due to
of the sky. Use a different
satellites. Use other lack of satellites.
GPS receiver or a non-GPS
navigation source.
based source of navigation.
Contact dealer for service.
GPS navigation lost
Use a different GPS receiver
and may have
GPS position lost due to or a non-GPS based source of
erroneous position.
erroneous position. navigation. Contact dealer
Use other
for service.
navigation source.
GPS approach not
Initiate a climb to the MSA or
available. GPS unable to
Abort Approach. other published safe altitude,
provide approach level
GPS approach is no abort the approach, and
of service (i.e., LPV,
longer available. execute a non-GPS based
LNAV, LNAV+V, or
approach.
L/VNAV).
GPS approach could not
Approach not transition to active (e.g.,
Abort the approach and then
active. Approach the unit remains in TERM
execute a non-GPS based
guidance not as it does not have the
approach.
available. required HPL/VPL for
LNAV).
Approach downgraded
GPS approach from LPV or LNAV/VNAV Continue to fly the approach
downgraded. to an LNAV approach. using published LNAV
Use LNAV minima. Vertical guidance no minimums.
longer available.

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 Messages

ADVISORY CONDITION CORRECTIVE ACTION

WAAS board is acquiring
position and may take
GPS searching sky.
longer than normal.
Ensure GPS antenna
Typically occurs when No action necessary.
has unobstructed
the unit is powered on
view of the sky.
after installation or being
off for several weeks.
WAAS board indicates
that its clock battery is
low. May experience
Low internal GPS
delay when attempting Contact dealer for service.
clock battery.
to acquire GPS position.
Almanac data may be
lost.
WAAS board is reporting Use a different GPS receiver
GPS receiver needs that it requires service. or a non-GPS based source of
service. GPS module may navigation. Contact dealer
continue to function. for service.

190-02488-01 Rev. A Pilot’s Guide 6-7

Messages

6.6 Navigation Advisories

ADVISORY CONDITION CORRECTIVE ACTION
The selected course on
the CDI/HSI does not
match the current
Set Course on Set the CDI/HSI selected
desired track.
CDI/HSI to course to the current desired
NOTE: This advisory is
<current DTK>. track.
not provided when
interfaced to a
composite type CDI.
It is past the specified
No action necessary.
Holding EFC time Expected Further
Consider contacting ATC as
has expired. Clearance time for the
appropriate.
user-defined hold.
True north The loaded procedure
approach. Verify references true north
Verify the NAV angle is set to
NAV angles are and the active leg has a
True north.
referenced to True published true north
north (ºT). reference.
Magnetic north
approach. Verify The loaded approach is
Change NAV angle setting to
NAV angles are magnetic, but the NAV
Magnetic.
referenced to angle reference is not.
Magnetic north.
NAV angles are
referenced to True NAV angle is set to True. No action necessary.
north (ºT).
NAV angles are
referenced to a user NAV angle is set to User. No action necessary.
set value (ºU).
Non-WGS84
Waypoint. See
No action necessary.
pilot’s guide. The active waypoint
For more information, read
Location may be does not reference the
“Points About Non-WGS84
different than WGS84 datum.
Waypoints” in this section.
where surveyed for
<WPT>.

6-8 Pilot’s Guide 190-02488-01 Rev. A

 Messages

Points About Non-WGS84 Waypoints

• There are several types of geodetic datums that a waypoint can reference.
• TSO-C146 requires that all waypoints reference the WGS84 datum, but allows
for navigation to coordinates not compliant with this standard as long as the
pilot is notified of the potential difference in location.
• Not all waypoints in the navigation database reference the WGS84 datum.
For some of these coordinates the reference datum is unknown. In such cases,
the “Non-WGS84 Waypoint” advisory displays.
• Garmin cannot determine the exact proximity of a non-compliant waypoint to
the WGS84 datum in use by the system. Typically, the distance is < 2 nm.
• Most non-WGS84 waypoints are outside of the United States.

6.7 Pilot Specified Advisories

These advisories display when the associated timer expires or reaches a preset value.
They are informational only. No action is necessary.

ADVISORY CONDITION CORRECTIVE ACTION

Acknowledge message.
SCHEDULED The custom message Edit Message key provides
MESSAGE - <Text>. timer expired. direct access to scheduled
message options.
Acknowledge message.
The generic timer is past Timers key provides direct
Timer has expired.
its preset value. access to the generic
clock/timer function.

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Messages

6.8 System Hardware Advisories

ADVISORY CONDITION CORRECTIVE ACTION
1. Push the inner knob
again. If it remains stuck,
<Unit> knob-push Dual concentric inner use the corresponding
stuck. knob is stuck. touchscreen controls.
2. Contact dealer if the
problem persists.
• Unit detects a cooling
fan fault. Extended operation at high
• Coloration may be temperatures is not
<Unit> cooling fan
incorrect. recommended as damage to
failed.
• Backlight may dim to the unit may occur. Contact
dealer for service.
reduce power and
heat.
Unit temperature Decrease cabin temperature
<Unit> over temp. exceeds the over and increase cabin airflow
Reducing backlight temperature threshold. near the unit. If the problem
brightness. Backlight dims to reduce persists, contact dealer for
power and heat. service.
Unit temperature is
below the normal If the problem persists,
<Unit> under temp.
operating temperature contact dealer for service.
threshold.
An error occurred in the
pilot stored data. The
following user settings
may be lost.
Pilot stored data • Map menu settings
was lost. Recheck • User waypoints Recheck settings.
settings.
• Catalog flight plans
• User field settings
• Unit convention
selection
System detects the
remote go around
Press the key/switch again.
Remote Go Around key/switch depressed for
If it remains stuck, contact
key is stuck. at least 30 seconds. It
dealer for service.
will now ignore this
input.

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 Messages

ADVISORY CONDITION CORRECTIVE ACTION

GTX 345 1/2 reports that
Decrease cabin temperature
its internal temperature
and increase cabin airflow
Transponder 1/2 exceeds the over
near the transponder. If the
overtemp. temperature threshold
problem persists, contact
(GPS 175 & GNC 355
dealer for service.
only).
GTX 345 1/2 reports that
its internal temperature
Transponder 1/2 is below the normal If the problem persists,
under temp. operating threshold contact dealer for service.
(GPS 175 & GNC 355
only).
Loss of calibration data.
GPS175/GNC 355
cannot communicate
with its configuration
module or other
hardware.
GNX 375 experiences a
fault related to one of
the following.
<Unit> needs • ADS-B/Nav Contact dealer for service.
service.
communication
• Altitude encoder
calibration
• Audio ROM
• Configuration
module
• Non-volatile memory
• Suppression bus
1. Reformat the SD card
using an external
The SD card is computer.
unreadable or corrupt 2. Re-insert the SD card in
(i.e., data is unavailable). the slot.
<Unit> SD card is 3. Contact dealer if the
invalid or failed. problem persists.
User ejects
Flight Stream 510
wireless datacard. Restart unit to reconnect.
Network connection is
lost.

190-02488-01 Rev. A Pilot’s Guide 6-11

Messages

ADVISORY CONDITION CORRECTIVE ACTION

1. Reformat the SD card
using an external
<Name> log computer.
encountered an Export failure. May occur
2. Re-insert the SD card in
error when for WAAS or traffic logs.
the slot.
exporting.
3. Contact dealer if the
problem persists.
<Name> log has Export to SD card
exported successful. May occur for No action necessary.
successfully. WAAS or traffic logs.
<Unit> is not receiving
Heading source heading information
inoperative or from any source. Contact dealer for service.
connection lost. Heading up map
orientation not available.
Pressure altitude <Unit> is not receiving
source inoperative pressure altitude data Contact dealer for service.
or connection lost. from any source.
Approach guidance is
Press "Enable APR
available from the Before engaging approach
Output" before
connected mode on the autopilot, tap
selecting APR on
KAP 140/KFC 225 the Enable APR Output key.
autopilot.
autopilot.
For GNX 375, or
GPS 175/GNC 355
ADS-B Out fault. configured to receive
Pressure altitude ADS-B In data from
Contact dealer for service.
source inoperative GTX 345:
or connection lost. Transponder loses
communication with the
pressure altitude source.

6-12 Pilot’s Guide 190-02488-01 Rev. A

 Messages

ADVISORY CONDITION CORRECTIVE ACTION

For GNX 375, or
GPS 175/GNC 355
configured to receive
ADS-B In data from
GTX 345:
Transponder detects an
internal failure.
Functionality may be
Transponder has
unavailable. Contact dealer for service.
failed.
Possible causes:
• 1090ES ADS-B Out
failure
• Transponder failure
• Communication with
the transponder is
lost
For GNX 375, or
GPS 175/GNC 355
configured to receive
Transponder is
ADS-B In data from Cycle power to the GNX 375
operating in ground
GTX 345: once ground test completes.
test mode.
Transponder is being
forced airborne for
ground test.
For GNX 375:
ADS-B is not
Transponder is not If the problem persists,
transmitting
receiving a valid GPS contact dealer for service.
position.
position.
The unit is in demo
<Unit> demo Power cycle the unit to exit
mode. Do not use for
mode. demo mode.
navigation.

190-02488-01 Rev. A Pilot’s Guide 6-13

Messages

6.8.1 COM Radio Advisories, GNC 355

ADVISORY CONDITION CORRECTIVE ACTION
COM radio is reporting
COM radio needs that it requires service. Cycle radio power.
service. Radio may continue to Contact dealer for service.
function.
Push and hold the external
COM radio is not COM remote transfer switch
COM radio may be
communicating with the (if installed) to force the radio
inoperative.
unit. to 121.5 MHz. Contact
dealer for service.
COM push-to-talk
key is stuck.
COM remote
transfer key is stuck. Unit detects the specified
COM remote key in the pressed
Verify that the key is not
frequency position for 30 seconds.
stuck. Contact dealer for
increment key The input is ignored as a
service if message persists.
is stuck. result. Radio stops
transmitting.
COM remote
frequency
decrement key
is stuck.
• Decrease length of COM
transmissions
COM radio is in • Decrease cabin
overtemp or temperature and increase
COM overtemp or undervoltage mode. cabin airflow, especially
undervoltage. Transmitting power
near the unit
Reducing automatically reduces to
transmitter power. prevent damage to the • Check aircraft voltage and
COM radio. Radio range reduce electrical load as
is reduced as a result. necessary
• Contact dealer for service
if message persists
COM locked to COM radio is locked to
121.5 MHz. Hold 121.5 MHz via the Hold remote transfer switch
remote COM external COM remote for two seconds to exit mode.
transfer key to exit. transfer switch.

6-14 Pilot’s Guide 190-02488-01 Rev. A

 Messages

6.9 Terrain Advisories

ADVISORY CONDITION CORRECTIVE ACTION
Terrain alerts are
inhibited. Re-enable Pilot enables terrain alert Open Terrain menu and
alerts in the Terrain inhibit function. deselect Terrain Inhibit.
menu.

190-02488-01 Rev. A Pilot’s Guide 6-15

Messages

6.10 Traffic System Advisories

6.10.1 Traffic Advisories, GPS 175 & GNC 355

ADVISORY CONDITION CORRECTIVE ACTION
ADS-B LRU unable to
1090ES traffic Service required.
receive 1090 Extended
receiver fault. Contact dealer for support.
Squitter traffic.
ADS-B Out fault. Verify transponder is in the
GDL 88 reports a control
Check transponder correct mode. Contact dealer
panel input failure.
is in correct mode. if message persists.
GDL 88 is unable to
transmit ADS-B
messages due to a
failure occurring with
one of the following:
• GPS position
ADS-B failure. • ICAO address
Unable to transmit verification
ADS-B messages.
• UAT transmitter
• UAT broadcast
• Bottom antenna
• Bottom and top
Service required.
antenna (GDL 88D
Contact dealer for support.
only)
ADS-B LRU reports one
of the following
conditions.
ADS-B fault.
• Low battery
GDL 88 needs
• Fan fault
service.
• GDL 88D fault with
only one antenna
operational
ADS-B traffic ADS-B LRU reports a
alerting function CSA or TSAA/ATAS
inoperative. failure.

6-16 Pilot’s Guide 190-02488-01 Rev. A

 Messages

ADVISORY CONDITION CORRECTIVE ACTION

ADS-B traffic ADS-B LRU reports a
function failure with the ADS-B
inoperative. Traffic input.
ADS-B LRU reports a
Traffic/FIS-B critical fault and is
functions inoperative.
inoperative. Communication with the
Service required.
ADS-B LRU is lost.
Contact dealer for support.
ADS-B LRU unable to
UAT traffic/FIS-B
receive UAT traffic and
receiver fault.
FIS-B data.
GDL 88
GDL 88 cannot
configuration
communicate with its
module needs
configuration module.
service.

190-02488-01 Rev. A Pilot’s Guide 6-17

Messages

6.10.2 Traffic Advisories, GNX 375

ADVISORY CONDITION CORRECTIVE ACTION
Unit is unable to receive
1090ES traffic
1090 Extended Squitter
receiver fault.
traffic.
ADS-B traffic
TSAA application reports
alerting function
it is unavailable to run.
inoperative.
Unit reports a failure
with the ADS-B Traffic
input. Possible causes:
• ADS-B/ADS-R/TIS-B
input fault
ADS-B traffic
• ADS-B In electrical Service required.
function
fault Contact dealer for support.
inoperative.
• All installed traffic
applications report as
“Unavailable to Run”
or
“Unavailable - Fault”
Traffic/FIS-B ADS-B In configuration
functions data fault (configuration
inoperative. parameters are invalid)
Unit unable to receive
UAT traffic/FIS-B
UAT traffic and FIS-B
receiver fault.
data.

6-18 Pilot’s Guide 190-02488-01 Rev. A

 Messages

6.11 VCALC Advisories

ADVISORY CONDITION CORRECTIVE ACTION
User configured a
vertical descent
calculation, and the
Approaching top of
aircraft is within No action necessary.
descent.
60 seconds of the
calculated top of
descent.
User configured a
vertical descent
Arriving at VCALC
calculation, and the No action necessary.
target altitude.
aircraft is approaching
target altitude.

6.12 Waypoint Advisories

ADVISORY CONDITION CORRECTIVE ACTION
Ensure media has the correct
User waypoint import
User waypoint file format. If the problem
failed due to improper
import failed. persists, contact dealer for
file format.
service.
User waypoint catalog is
User waypoint
full. Import of the Delete any unnecessary user
import failed. User
requested user waypoints from the catalog
waypoint database
waypoints could not and try again.
is full.
complete.
User waypoints
User waypoint import
were imported No action necessary.
successful.
successfully.
User waypoints User waypoint import
imported successful. Import
successfully - function reuses existing No action necessary.
existing waypoints user waypoints instead
reused. of creating duplicates.

190-02488-01 Rev. A Pilot’s Guide 6-19

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6-20 Pilot’s Guide 190-02488-01 Rev. A

 Qualification

7 Qualification
NOTE
The procedures described in this section are not authorized for completion
during flight. All tasks must be performed while the aircraft is on the
ground.

7.1 Glove Qualification

The touchscreen uses capacitive touch technology to sense the proximity of skin to
the display. A glove creates a barrier between the skin and the display glass,
potentially reducing the ability of the display to detect touches.
This procedure qualifies a specific glove for use with the touchscreen. Due to
differences in finger size and glove size, the qualification procedure is specific to the
pilot/glove combination. Multiple units must be evaluated individually.

GLOVE SELECTION CONSIDERATIONS

• Thinner gloves perform better than thicker gloves.
• Leather gloves, and gloves designed specifically for use with capacitive
touchscreen devices, are often found to be acceptable.
• To improve touchscreen sensitivity while wearing gloves, use the pad of your
finger instead of the tip during touch interactions.

GLOVE QUALIFICATION GUIDANCE

• Checklist 1 contains the tasks required to qualify a glove.
• Checklist 2 contains tasks that are not required to qualify a glove, but may
limit how some functions are accessed while wearing a glove.

190-02488-01 Rev. A Pilot’s Guide 7-1

Qualification

GLOVE QUALIFICATION STEPS

Complete only the tasks for the capabilities relevant to the installed navigator.
1. Sitting in the pilot’s seat, start the unit in normal mode.
2. Perform the tasks listed in each checklist, tapping the specified keys with a
non-gloved finger. It is not necessary to record any results for this step.
3. Repeat step 3 using a gloved hand.
4. For each task, determine whether the touchscreen response is the same or
worse than without the glove.
5. Record the results in the applicable column. Items that may cause the
operation to be worse include, but are not limited to:
• Multiple attempts to select a key
• Unintentional selection of adjacent key(s)
• Excessive force on the touchscreen to select a key
6. If all applicable tasks produce the same response with and without a glove,
you may use the glove in flight.

GLOVE QUALIFICATION PROCEDURE

Pilot:

Glove Description:

Circle the applicable navigator.

GPS 175 GNC 355 GNC 355A GNX 375

7-2 Pilot’s Guide 190-02488-01 Rev. A

 Qualification

CHECKLIST 1
REQUIRED TASKS

OPERATION WITH GLOVE

TASK
(CIRCLE ONE)
Starting from the Home page:
Waypoint Same Worse

Type the airport identifier “KSLE.” Same Worse

Enter Same Worse

Return to the Home page.
Flight Plan Same Worse

Add Waypoint Same Worse

Type the airport identifier “KSLE.” Same Worse

Enter Same Worse

Add each of the following waypoints in the same manner.
KMMV Same Worse

KONP Same Worse

BTG Same Worse

Select BTG. Same Worse

Load Airway Same Worse

V23 Same Worse

ALFOR Same Worse

Load Same Worse

Scroll the list of flight plan waypoints up and
Same Worse
down.
Back Same Worse

190-02488-01 Rev. A Pilot’s Guide 7-3

Qualification

CHECKLIST 2
NON-REQUIRED TASKS

OPERATION WITH GLOVE

TASK
(CIRCLE ONE)
Open the Active Flight Plan page. Same Worse
With one finger on the page, drag the waypoint
Same Worse
list up and down.
With one finger, swipe the list up and down. Same Worse

Back Same Worse

Open the Map page.
Graphically Edit FPL Same Worse
Drag KONP to an empty area of the map,
panning and zooming as necessary. Observe Same Worse
that KONP is removed from the flight plan.
Drag the leg between KMMV and BTG to KSPB.
Same Worse
Observe that KSPB is added to the flight plan.

7-4 Pilot’s Guide 190-02488-01 Rev. A

 Glossary

8 Glossary
A
ACT Altitude Compensated Tilt

ADAHRS Air Data/Attitude & Heading Reference System

ADC Air Data Computer

ADIZ Air Defense Identification Zone

ADS-B Automatic Dependent Surveillance Broadcast

AFM Aircraft Flight Manual

AFMS Aircraft Flight Manual Supplement

AGL Above Ground Level

AHRS Attitude Heading Reference System

AIM Airman’s Information Manual

AIRB Basic Airborne Application

ALT Altitude Hold

AP Autopilot

ARTCC Air Route Traffic Control Center

AR Approval Required

ASOS Automated Service Observing System

ATAS ADS-B Traffic Advisory System

ATC Air Traffic Control

ATIS Automatic Terminal Information Service

ATK Along Track

AWOS Automated Weather Observing Station

C
CDI Course Deviation Indicator

CDU Control and Display Unit

CRS Course

CTAF Common Traffic Advisory Frequency

190-02488-01 Rev. A Pilot’s Guide 8-1

Glossary

D
DG Directional Gyro

DME Distance Measuring Equipment

E
EDR Excessive Descent Rate

EFC Expected Further Clearance

ENR En Route

ESP Electronic Stability and Protection

F
FAF Final Approach Fix

FDC Flight Data Center

FIS-B Flight Information Services Broadcast

FLTA Forward Looking Terrain Avoidance

FMS Flight Management System

FPL Flight Plan

FPM Feet Per Minute

FSS Flight Service Station

G
GCS Ground Clutter Suppression

GDC Garmin Air Data Computer

GDL Garmin Data Link

GDU Garmin Display Unit

GFC Garmin Flight Controller

GP Glidepath

GPS Global Positioning System

GPSS Global Positioning System Steering

8-2 Pilot’s Guide 190-02488-01 Rev. A

 Glossary

GRS Garmin Reference System

GS Glideslope

GSL Geometric Sea Level

GSU Garmin Sensing Unit

GTP Garmin Temperature Probe

H
HDG Heading

HOT Hazardous Obstacle Transmission

HPL Horizontal Protection Level

HSDB High Speed Data Bus

I
IAF Initial Approach Fix

IAS Indicated Airspeed

IAT Induction Air Temperature

IFR Instrument Flight Rules

IGRF International Geomagnetic Reference Field

ILI Imminent Line Impact

ILS Instrument Landing System

INT Intersection

IOI Imminent Obstacle Impact

ISA International Standard Atmosphere

ITI Imminent Terrain Impact

K
KIAS Knots Indicated Airspeed

L
LDI Lateral Deviation Indicator

LOA Letter of Authorization

LOC Localizer

LRU Line Replaceable Unit

190-02488-01 Rev. A Pilot’s Guide 8-3

Glossary

M
MAP Missed Approach Point

MAHP Missed Approach Holding Point

MDA Minimum Descent Altitude

METAR Meteorological Terminal Aviation Routine Weather Report

MOA Military Operations Area

MSL Mean Sea Level

N
NAVAID Navigation Aid

NCR Negative Climb Rate

NDB Non-Directional Beacon

NEXRAD Next-Generation Radar

O
OAT Outside Air Temperature

OBS Omni Bearing Selector

OCN Oceanic

P
PCL Pilot Controlled Lighting

PDA Premature Descent Alert

PRF Pulse Repetition Frequency

PVT Position, Velocity, and Time

R
RAIM Receiver Autonomous Integrity Monitoring

RF Radius to Fix

RLC Reduced Line Clearance

RNAV Area Navigation

RNP Required Navigation Performance

ROC Reduced Required Obstacle Clearance

RTC Reduced Required Terrain Clearance

8-4 Pilot’s Guide 190-02488-01 Rev. A

 Glossary

S
SAT Static Air Temperature

SBAS Satellite-Based Augmentation System

SBS Surveillance and Broadcast Services

SD Secure Datacard

SSID Service Set Identifier

STAR Standard Terminal Arrival

STBY Standby

SURF Surface Situation Awareness

SVID Satellite-Vehicle Identification

T
TA Traffic Advisory

TAF Terminal Aerodrome Forecast

TAS Traffic Advisory System

TAT Total Air Temperature

TCAD Traffic Alert and Collision Avoidance Devices

TCAS Traffic Alert and Collision Avoidance System

TCH Threshold Crossing Height

TERM Terminal

TFR Temporary Flight Restriction

TIS Traffic Information Service

TSAA Traffic Situational Awareness with Alerting

TSO Technical Standard Order

U
UTC Universal Time Coordinated

190-02488-01 Rev. A Pilot’s Guide 8-5

Glossary

V
VCALC Vertical Calculator

VDI Vertical Deviation Indicator

VFR Visual Flight Rules

VLOC VOR/Localizer

VNAV Vertical Navigation

VOR Very High Frequency Omni-directional Range

VPL Vertical Protection Level

VRP Visual Reporting Point

VS Vertical Speed

W
WAAS Wide Area Augmentation System

WPT Waypoint

X
XPDR Transponder

8-6 Pilot’s Guide 190-02488-01 Rev. A

 Compliance

9 Compliance
AC 90-100A STATEMENT OF COMPLIANCE
The Garmin navigational unit meets the performance and functional requirements of
FAA Advisory Circular (AC) 90-100A, U.S. Terminal and En Route Area Navigation
(RNAV) Operations.

SOFTWARE LICENSE AGREEMENT

BY USING THE DEVICE, COMPONENT OR SYSTEM MANUFACTURED OR SOLD BY
GARMIN ("THE GARMIN PRODUCT"), YOU AGREE TO BE BOUND BY THE TERMS
AND CONDITIONS OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE
READ THIS AGREEMENT CAREFULLY. Garmin Ltd. and its subsidiaries ("Garmin")
grants you a limited license to use the software embedded in the Garmin Product
(the "Software") in binary executable form in the normal operation of the Garmin
Product. Title, ownership rights, and intellectual property rights in and to the
Software remain with Garmin and/or its third-party providers. You acknowledge that
the Software is the property of Garmin and/or its third-party providers and is
protected under the United States of America copyright laws and international
copyright treaties. You further acknowledge that the structure, organization, and
code of the Software are valuable trade secrets of Garmin and/or its third-party
providers and that the Software in source code form remains a valuable trade secret
of Garmin and/or its third-party providers. You agree not to reproduce, decompile,
disassemble, modify, reverse assemble, reverse engineer, or reduce to human
readable form the Software or any part thereof or create any derivative works based
on the Software. You agree not to export or re-export the Software to any country in
violation of the export control laws of the United States of America.

190-02488-01 Rev. A Pilot’s Guide 9-1

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9-2 Pilot’s Guide 190-02488-01 Rev. A

190-02488-01 Rev. A
190-02488-01 Rev. A