T

2101 I/O
Approach Plus
GPS Navigator

Pilot Guide
Publication Number 82881
Revision E
April 27, 1998

Software -241( )
Trimble • 2105 Donley Drive • Austin, TX 78758
(512) 432-0400
No part of this manual may be reproduced in any
form or by any means or used to make a derivative
work (such as translation, transformation or adapta-
tion) without permission from Trimble Navigation.

Copyright © 1997

T
2105 Donley Drive
Austin, TX 78758
(512) 432-0400
Limited Warranty T

I. HARDWARE
TRIMBLE NAVIGATION, LTD. (“TRIMBLE”), 2105 Donley Drive, Austin, TX 78758, hereby
warrants to the first retail purchaser only, that hardware purchased hereunder will be free
from defects in material and workmanship for a period of two (2) years from the date of
installation, not to exceed thirty (30) months from the date of shipment from TRIMBLE’s
factory. Should defects be found, TRIMBLE at its option, will repair or replace the product in
which physical defects in materials or workmanship occur. The foregoing states the sole
liability and obligation of TRIMBLE arising out of this warranty, and such warranty is subject
to the following CONDITIONS AND LIMITATIONS.

(A) The defect shall occur under normal use and service for which this product was
intended. TRIMBLE shall not be obligated or liable under this Warranty for defects
which TRIMBLE’s examination discloses are due to: (1) tampering, (2) misuse, (3)
abuse, (4) neglect, (5) improper storage or maintenance, (6) use in a manner beyond
which such equipment is normally intended to be used, (7) improper repair or poor
workmanship by those who are not authorized by TRIMBLE to repair the products or
use of defective material by such unauthorized persons, and (8) any other cause
except for defects in material or workmanship caused by TRIMBLE.
(B) The warranty card supplied with the product must be completed and returned to
TRIMBLE within 15 days of installation of the product in order for this Warranty to
become effective.

(C) The product is sold and installed by an authorized dealer. A list of all authorized
TRIMBLE dealers may be obtained from TRIMBLE.

(D) The company must have received a copy of a completed FAA Form 337 covering
installation of the product in the purchaser’s aircraft, or equivalent documentation
showing installation of the product by the authorized TRIMBLE dealer.
(E) The product shall be returned to TRIMBLE via the dealer with transportation charges
prepaid. After correction of the defects, the products will be returned to the purchaser,
transportation charges prepaid, except for returns to purchasers in foreign countries,
which purchasers shall be responsible for payment of such charges from the American
Port of exit to purchaser’s place of business. The risk of loss or damage to all products
in transit shall be assumed by the party initiating the transportation of such products.

II. DATA
TRIMBLE warrants that the media on which the database is recorded will be free from
defects in materials and workmanship under normal use for a period of two (2) years from
the Delivery Date. Purchaser’s sole and exclusive remedy, and TRIMBLE’s sole and
exclusive liability, under this warranty will be TRIMBLE’s replacement of the media.
III. ITEMS NOT COVERED BY WARRANTY
EXCEPT FOR THE EXPRESS WARRANTIES GRANTED IN SECTIONS I AND II ABOVE,
TRIMBLE MAKES NO OTHER WARRANTIES, EXPRESSED OR IMPLIED, WITH RESPECT
TO ITS PRODUCT AND DISCLAIMS THE SAME. TRIMBLE MAKES NO EXPRESS OR
IMPLIED WARRANTY WITH RESPECT TO THE DESIGN, ADEQUACY, ACCURACY,
RELIABILITY, SAFETY OR CONFORMANCE WITH GOVERNMENT STANDARDS OR
REGULATION OF ANY FLIGHT PROCEDURE PRESCRIBED BY A GOVERNMENT
AUTHORITY, INCLUDING, BUT NOT LIMITED TO, ANY EXPRESS OR IMPLIED WAR-
RANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FURTHER,
TRIMBLE MAKES NO WARRANTY, EXPRESS OR IMPLIED, WITH RESPECT TO THE
ADEQUACY, ACCURACY, RELIABILITY, SAFETY, OR CONFORMANCE WITH GOVERN-
MENT STANDARDS OR REGULATIONS, OF ANY INFORMATION CONTAINED IN THE
PRODUCT WHICH IS PUBLISHED BY OTHERS OR WHICH TRIMBLE OBTAINED FROM
OTHERS.

FURTHER, TRIMBLE MAKES NO EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO

THE COMPLETENESS OF ANY DATA, FLIGHT INFORMATION, OR FLIGHT PROCEDURE
CONTAINED IN ITS PRODUCT. TRIMBLE DOES NOT INCLUDE ALL AVAILABLE DATA IN
ITS PRODUCT.

IV. LIMITATIONS ON WARRANTY

THIS WARRANTY IS LIMITED TO THE ORIGINAL RETAIL PURCHASER, EXCEPT WHERE
THE PRODUCT IS USED OR PURCHASED PRIMARILY FOR THE PURCHASER’S
PERSONAL OR FAMILY USE, THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES
EXPRESSED OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRAN-
TIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, IF ANY, AND
SAID IMPLIED WARRANTIES ARE HEREBY EXPRESSLY EXCLUDED AND DISCLAIMED.

WHERE THE PRODUCT IS USED OR PURCHASED PRIMARILY FOR THE PURCHASER’S

PERSONAL OR FAMILY USE, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE, IF ANY, ARE HEREBY EXPRESSLY LIMITED
TO TWO (2) YEARS FROM THE DATE OF PURCHASE OF THE PRODUCT.

SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF AN IMPLIED

WARRANTY, OR OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, THEREFORE, THE
ABOVE LIMITATIONS CONCERNING THE EXCLUSION OF IMPLIED WARRANTIES AND
LIMITATIONS OF DAMAGES MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU
SPECIFIC RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM
STATE TO STATE.

LIMITATION OF LIABILITY
TRIMBLE’S LIABILITY ARISING OUT OF THIS AGREEMENT SHALL NOT EXCEED THE
AMOUNTS PAID BY YOU TO OBTAIN THE PRODUCT. TRIMBLE SHALL NOT BE LIABLE
FOR SPECIAL, CONSEQUENTIAL, INCIDENTAL OR OTHER TYPES OF DAMAGES,
INCLUDING WITHOUT LIMITATION, LOSS OF USE, LOST PROFITS, AND PERSONAL
INJURY. TRIMBLE EXPRESSLY EXCLUDES AND DISCLAIMS SUCH DAMAGES
RESULTING FROM OR CAUSED BY, THE USE, OPERATION, FAILURE, MALFUNCTION
OR DEFECT OF ANY TRIMBLE PRODUCT, WHETHER OR NOT LIABILITY FOR SUCH
DAMAGES IS DUE TO TORT (INCLUDING NEGLIGENCE), CONTRACT, WARRANTY, OR
STRICT LIABILITY. THESE LIMITATIONS WILL APPLY EVEN IF TRIMBLE OR AN
AUTHORIZED DEALER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE,
AND NOTWITHSTANDING ANY FAILURE OF ESSENTIAL PURPOSE OF ANY LIMITED
REMEDY. YOU ACKNOWLEDGE THAT THE AMOUNT PAID FOR THE PRODUCT
REFLECTS THIS ALLOCATION OF RISK. SOME STATES DO NOT ALLOW THE
LIMITATION OR EXCLUSION OF LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
To obtain service under this warranty contact: Trimble Navigation Avionics Service at
(512) 432-0400.

Purchase Date Model Number Serial Number

 TRIMBLE 2101 I/O Approach Plus
Insert latest change pages and destroy superseded pages.

LIST OF EFFECTIVE PAGES

Dates of Original and Change pages are:
Revision A February 28, 1997
Revision B May 12, 1997
Revision C August 25, 1997
Revision D November 14, 1997
Revision E April 27, 1998

Page Description Page No. Date

Title Page April 27, 1998
List of Effective Pages A-C April 27, 1998
Record of Revisions D April 27, 1998
Table of Contents i February 28, 1997
ii April 27, 1998
iii February 28, 1997
iv August 25, 1997
v April 27, 1998
vi February 28, 1997
vii April 27, 1998
viii February 27, 1997
Introduction I-1 - I-6 February 28, 1997
I-7 August 25, 1997
I-8 February 28, 1997
Chapter 1 - Getting Started 1-1 February 28, 1997
1-2 April 27, 1998
1-3 - 1-5 February 28, 1997
1-6 - 1-7 April 27, 1998
1-8 February 28, 1997
1-9 May 12, 1997
1-10 - 1-12 February 28, 1997
1-13 August 25, 1997
1-14 February 28, 1997
Chapter 2 - Using the Navigator 2-1 February 28, 1997
2-2 April 27, 1998
2-3 February 28, 1997
2-4 May 12, 1997
2-5 April 27, 1998
2-6 - 2-10 February 28, 1997
Chapter 3 - Approaches 3-1 April 27, 1998
3-2 February 28, 1997
3-3 -3-5 April 27, 1998
3-6 February 28, 1997
3-7 May 12, 1997

Revision E Page A
April 27, 1998
 TRIMBLE 2101 I/O Approach Plus
Insert latest change pages and destroy superseded pages.

LIST OF EFFECTIVE PAGES

Page Description Page No. Date

3-8 - 3-11 February 28, 1997

3-12 April 27, 1998
3-13 February 28, 1997
3-14 May 12, 1997
3-15 - 3-17 February 28, 1997
3-18 May 12, 1997
3-19 - 3-20 February 28, 1997
3-21-3-22 April 27, 1998
Chapter 4 - The Waypoint Key 4-1 - 4-22 February 28, 1997
Chapter 5 - The Flight Plan Key 5-1 February 28, 1997
5-2 - 5-3 May 12, 1997
5-4 - 5-8 February 28, 1997
5-9 May 12, 1997
5-10 February 28, 1997
5-11 - 5-13 May 12, 1997
5-14 - 5-18 February 28, 1997
5-19 August 25, 1997
5-20 February 28, 1997
Chapter 6 - The Nav Key 6-1 February 28, 1997
6-2 - 6-4 April 27, 1998
6-5 February 28, 1997
6-6 - 6-12 April 27, 1998
Chapter 7 - The Calculator Key 7-1 - 7-3 February 28, 1997
7-4 - 7-5 May 12, 1997
7-6 - 7-7 February 28, 1997
7-8 April 27, 1998
7-13 February 28, 1997
7-14 April 27, 1998
7-15 - 7-16 February 28, 1997
7-17 - 7-18 April 27, 1998
Chapter 8 - The Auxiliary Key 8-1 - 8-2 April 27, 1998
8-3 - 8-13 February 28, 1997
8-14 April 27, 1998
8-15 February 28, 1997
8-16 April 27, 1998
8-17 - 8-27 February 28, 1997
8-28 April 27, 1998
8-29 February 28, 1997
8-30 - 8-34 April 27, 1998

Revision E Page B
April 27, 1998
 TRIMBLE 2101 I/O Approach Plus
Insert latest change pages and destroy superseded pages.

LIST OF EFFECTIVE PAGES

Page Description Page No. Date

Chapter 9 - The Message Key 9-1 - 9-5 February 28, 1997

9-6 - 9-12 November 14, 1997
9-13 - 9-14 April 27, 1998
Appendix A - Reference A-1 - A-9 February 28, 1997
A-10 April 27, 1998
A-11 - A-16 February 28, 1997
Appendix B - The GPS System:
How It Works B-1 - B-9 February 28, 1997
B-10 - B-12 May 12, 1997
Appendix C - The User Setup Mode C-1 May 12, 1997
C-2 February 28, 1997
C-3 May 12, 1997
C-4 - C-5 February 28, 1997
C-6 - C-7 April 27, 1998
C-8 February 28, 1997
C-9 - C-10 April 27, 1998
C-11 - C12 February 28, 1997
Glossary G-1 February 28, 1997
G-2 - G-8 April 27, 1998
Index IND-1 -
IND-10 April 27, 1998

Revision E Page C
April 27, 1998
 TRIMBLE 2101 I/O Approach Plus

RECORD OF REVISIONS
Assigned To (Job Title) Location

Rev Revision Insertion By Rev Revision Insertion By

No. Date Date No. Date Date

Revision E Page D
April 27, 1998
 Table of Contents

Table of Contents
Introduction

The Navigator Functions .......................................... I-2

Safety First ............................................................... I-3
Other Things You Should Know ............................... I-3
Warranty Information .......................................... I-3
Service Information ............................................. I-4
Quick Reference Card ....................................... I-4
Installation Manual .............................................. I-4
Jeppesen Database - General Use ................... I-4
Jeppesen Database - International Use .............. I-5
Altitude Sources ................................................. I-5
Heading Sources ................................................ I-5
True Airspeed Sources ....................................... I-6
Wind Calculation ................................................ I-6
Air and Fuel Data Computer ............................... I-6
About This Guide ...................................................... I-7
1 Getting Started

1.1 The Navigator Components .............................. 1-2

1.2 The Jeppesen Navigation Database ................. 1-3
1.2.1 NavData Card ....................................... 1-6
1.3 The Power Switch ............................................ 1-7
1.4 The LED Display .............................................. 1-7
1.5 Operation Overview .......................................... 1-8
1.5.1 Basic Operating Principles ..................1-10
1.5.2 The Internal Annunciator Lights ............1-12

Revision A i
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

2 Using the Navigator

2.1 Power-Up ......................................................... 2­2

2.2 ENT Key ........................................................... 2­2
2.3 Data Selector Knobs ........................................ 2­3
2.3.1 Page Selection ..................................... 2­3
2.3.2 Data Entry ............................................. 2­3
2.4 Direct-to Key .................................................... 2­4
2.5 Mode Restore ................................................... 2­5
2.6 Entering a Flight Plan ....................................... 2­6
3 Approaches

3.1 What is a GPS Approach? ................................ 3­2

3.2 The Basic Rules of GPS Approaches .............. 3­3
3.3 How to Select the Approach ............................. 3­4
3.4 How to Join an Active Approach in the Middle ... 3­6
3.5 How to Enable the Approach ............................ 3­7
3.5.1 View APPROACH ENABLE Status ....... 3­7
3.5.2 Update the Baro Setting ........................ 3­8
3.5.3 Disable the Approach ............................ 3­8
3.6 How to Perform a Course Reversal ................. 3­8
3.6.1 Procedure Turn Course Reversals ....... 3­9
3.6.2 Holding Pattern Course Reversals ......3­10
3.6.3 Teardrop Course Reversals................. 3­11
3.7 How to Fly a DME Arc Approach ...................... 3­11
3.8 Missed Approach .............................................3­14
3.8.1 Missed Approach Before the MAP .......3­14
3.8.2 Missed Approach Beyond the MAP ......3­14
3.9 How to Fly a GPS Approach ............................3­15
3.10 RAIM ............................................................3­17
3.10.1 RAIM Prediction ...................................3­18
3.10.2 RAIM Prediction on the Approach ........3­20
3.11 DGPS Approaches ......................................3-21

ii Revision E
April 27, 1998
 Table of Contents

4 The Waypoint Key

4.1 Waypoint Information ........................................ 4-2

4.2 The Waypoint Displays ..................................... 4-4
4.3 Selecting Airport, VOR, NDB, Intersection
or User Waypoints ............................................ 4-8
4.3.1 Select a Waypoint by Identifier .............. 4-9
4.3.2 Select a Waypoint by City Name .......... 4-9
4.3.3 Select a Waypoint by Waypoint Name .4-10
4.3.4 Scan Waypoint Identifiers ....................4-10
4.4 Selecting Approach, SID, and STAR
Procedures ...................................................... 4-11
4.4.1 To Fully Define a Procedure.................4-13
4.4.2 To Select a Procedure Name ...............4-13
4.4.3 To Select a Transition ..........................4-14
4.5 Activating a Waypoint or Procedure
from WPT ........................................................4-14
4.5.1 Selecting Direct Steering to Waypoint
in WPT.................................................4-14
4.5.2 Activating a SID or STAR Procedure ...4-15
4.5.2.1 Select Direct to the
First Waypoint ...............................4-15
4.5.2.2 Join a Leg of the Procedure ..........4-15
4.5.2.3 Direct-to Any Waypoint in the
Procedure .....................................4-16
4.6 User Waypoints ...............................................4-16
4.6.1 Creating a User Waypoint ....................4-16
4.6.2 Editing a User Waypoint ......................4-19
4.6.3 Erasing a User Waypoint .....................4-19
4. Activating an Approach Procedure...................4-20
4.7.1 Select Direct-to the First Approach
Waypoint ..............................................4-20
4.7.2 Join a Leg of the Approach Procedure .4-20
4.7.3 Direct to Any Waypoint in the Approach
Procedure ............................................4-21
4.7.4 Fly Direct to the FAF ............................4-21
4.7.5 Intercept the Final Course Inbound ......4-22
Revision A iii
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

5 The Flight Plan Key

5.1 Flight Plan Modes ............................................. 5-2

5.2 Entering Waypoints and Procedures ................ 5-4
5.3 Building a Flight Plan ........................................ 5-6
5.3.1 Adding a Waypoint by Identifier ............. 5-6
5.3.2 Adding a Waypoint Using WPT ............. 5-7
5.3.3 Adding a Waypoint Using NRST ........... 5-7
5.3.4 Adding a Procedure .............................. 5-8
5.4 Editing a Flight Plan .......................................... 5-9
5.4.1 Insert, Replace or Delete Waypoints ...5-10
5.4.2 Insert a Procedure ...............................5-10
5.4.3 Replace or Delete a Procedure ...........5-12
5.4.4 Editing a SID or STAR Procedure ........5-12
5.5 Review Legs of a Flight Plan ...........................5-13
5.6 Reversing a Flight Plan ...................................5-14
5.7 Activating a Flight Plan ....................................5-14
5.7.1 Join a Flight Plan Leg ...........................5-14
5.7.2 Direct-to a Flight Plan Leg ...................5-15
5.8 Canceling an Active Flight Plan .......................5-15
5.9 Erasing a Flight Plan .......................................5-16
5.10 Nearest Waypoints and Agencies ................5-17
5.11 Holding Patterns ..........................................5-18
5.11.1 Holding at a FPL Waypoint ...................5-18
5.11.2 Holding Outside of a Flight Plan ...........5-18
5.11.3 Holding After a Missed Approach .........5-19
5.12 Oceanic/Remote Operations ........................5-19

iv Revision C
August 25, 1997
 Table of Contents

6 The NAV Key

6.1 Nav Mode .......................................................... 6­2

6.1.1 Nav Displays ......................................... 6­3
6.1.2 Advisory Waypoint ................................ 6­4
6.1.3 The Time Display .................................. 6­5
6.1.4 The Vertical Navigation Display ............. 6-6
6.2 Ground Track Displays ..................................... 6­7
6.2.1 Track Error Graphic Display ................. 6­7
6.2.2 CDI Display ........................................... 6­9
6.2.2.1 Cross-Track Errors – Ground Track 6­9
6.2.2.2 CDI Scale .....................................6­10
6.3 Waypoint Information Mode ............................. 6­11
7 The Calculator Key

7.1 Entering Data in the CALC Mode ...................... 7­2

7.2 Flight Plan/Fuel Pages ..................................... 7­2
7.2.1 Time, Distance and Speed Calculations 7­3
7.2.2 Fuel Management Calculations ............ 7­4
7.2.3 Fuel Remaining Page ........................... 7­5
7.2.4 Fuel At Arrival Page ............................... 7­6
7.2.5 Minimum Fuel Page .............................. 7­7
7.2.6 Total Fuel Used Page ............................ 7­8
7.2.7 Engine Fuel Flow Page ......................... 7­8
7.3 Air Data Pages ................................................. 7­9
7.3.1 Pressure Altitude Calculations .............. 7­9
7.3.2 Density Altitude Calculations ................7­10
7.3.3 True Airspeed (TAS) Calculations ........ 7­11
7.3.4 Winds Aloft Calculations ......................7­13
7.3.5 Crosswind and Head Wind
Calculations .........................................7­15
7.4 Saving the Present Position ............................7­16
7.4.1 Copy a Phonetic Waypoint...................7­16
7.5 Vertical Navigation Profiles ..............................7-17

Revision E v
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

8 The Auxiliary Key

Auxiliary Mode Features ......................................... 8-2

8.1 The Checklist Mode .......................................... 8-3
8.1.1 Creating and Naming Checklists .......... 8-3
8.1.2 Using a Checklist .................................. 8-5
8.1.3 Editing a Checklist ................................ 8-6
8.1.4 Inserting and Deleting Checklist Items .. 8-7
8.1.5 Deleting a Checklist .............................. 8-9
8.2 The System Status Mode ................................8-10
8.2.1 The Date/Time Display ........................8-10
8.2.2 The Present Position Display ..............8-12
8.2.2.1 The Altitude Display ......................8-12
8.2.2.2 Entering Manual Altitude ................8-14
8.2.2.3 Pressure Altitude and
GPS Altitude ..................................8-14
8.2.3 The Voltage and Temperature Display .8-15
8.2.3.1 The Crystal Offset and Memory
Battery Display ..............................8-15
8.2.3.2 The GPS Antenna Display ............8-16
8.2.4 The Database Expiration Display ........8-16
8.2.5 The Software Revisions Display ..........8-17
8.2.6 The System Code Display ...................8-17
8.3 The Sensor Status Mode .................................8-18
8.3.1 GPS Sensor Status .............................8-18
8.3.2 Estimated Accuracy .............................8-20
8.3.3 GPS Satellites Tracked Display ...........8-21
8.3.4 GPS Satellite Status Display ................8-21
8.3.4.1 Satellite Database .........................8-22
8.3.5 GPS Sensor Reset ..............................8-23
8.3.6 GPS Satellite Availability ......................8-24
8.3.7 Approach RAIM Availability ...................8-25

vi Revision A
February 28, 1997
 Table of Contents

8.4 The Configure Mode ........................................8­26

8.4.1 Selecting a Parallel Offset ...................8­26
8.4.2 I/O Interface Check ..............................8­27
8.4.3 The Dead Reckoning Display -
Demo Mode .........................................8­28
8.4.4 The Display Diagnostic Page ..............8­30
8.5 User Setup Mode ............................................8­30
8.6 DGPS Tuning Mode .........................................8-30
8.6.1 Execute VDL Tuning ............................8-33
9 The Message Key

9.1 Accessing Messages ....................................... 9­2

9.2 System Messages ............................................ 9­4
9.3 AUX I/O Messages ............................................ 9­8
9.4 Advisory Messages .......................................... 9­9
9.4.1 Database Advisory Messages .............. 9­9
9.4.2 Flight Plan Advisory Messages ............. 9­9
9.4.3 Approach Advisory Messages ..............9­10
9.4.4 Parallel Track Advisory Messages .......9­10
9.4.5 Fuel Management Advisory Messages 9­11
9.4.6 AIRWATCH™ Advisory Messages ......9­12
9.4.7 Other Advisory Messages ....................9-12
9.4.8 VDL Messages ....................................9-13
Appendix A - Reference

Appendix B - The GPS System: How it Works

Appendix C - The User Setup Mode

Glossary

Index

Revision E vii
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

This page intentionally left blank.

viii Revision A
February 28, 1997
 Introduction

Introduction

The Trimble 2101 I/O Approach Plus GPS Navigator is a powerful

navigation management system designed for simple operation. It is
an advanced GPS system that provides IFR En route, Terminal, and
Approach navigation. The Trimble 2101 I/O Approach Plus GPS
Navigator is capable of position accuracies better than 15 meters,
anywhere, any time, and in any weather. The Navigator has low
susceptibility to jamming and interference, and as an integral part of
the future ATC system, its growth potential is great.

The Trimble 2101 I/O Approach Plus GPS Navigator calculates

position in three dimensions: Latitude, Longitude and Altitude. It
uses Global Positioning System (GPS) satellites, is completely
automatic, and requires no initialization.

The Trimble 2101 I/O Approach Plus GPS Navigator uses a state of
the art, DZUS rail-mounted design, and features:

• A twelve-channel GPS receiver that calculates position

and monitors signal integrity.
• Direct access to worldwide data on Airports, Approaches,
SIDs, STARs, VORs, NDBs, Intersections, and special
use airspaces on the Jeppesen database card used by
the Navigator. This information can be accessed using
either the standard identifier (for example, LAX), the ICAO
identifier (for example, CYYZ), or the city or object name.
• Push-button and knob-select functions that are simple
and consistent, making them easy to learn and remem-
ber. Its annunciator lights clearly show your unit’s mode
of operation and any messages it issues.

Revision A I-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

The Navigator Functions

The Trimble 2101 I/O Approach Plus GPS Navigator performs a wide
variety of navigation functions.

Direct Navigation Designate a destination and fly directly

to it from any position.

Flight Plan Navigation Define a flight plan with up to 40

waypoints and be guided automatically
along the selected route.

Position Finding Determine current position in terms of

latitude and longitude or bearing and
distance from any point.

ETA/Fuel Consumption Monitor a flight’s progression and

determine accurately the time of arrival
and fuel consumption.

Emergency Navigation Determine the nearest Airport, VOR,

NDB, or Agency with the press of one
button.

Controlled Airspace Receive immediate notification if the

aircraft is approaching a controlled
airspace, or if a selected flight plan leg
enters a controlled airspace.

Preflight Planning Determine the distance and bearing to

destination, distance and bearing of
any leg, total flight plan distance, and
other useful information before
departure.

Navigator Functions Access information or perform calcula-

tions including waypoint data (such as
airport communication frequencies,
runway lengths, and approach type),
estimated time en route and time of
arrival, ground track and ground speed,
minimum safe altitude, minimum en
route safe altitude, desired and actual
tracks, winds aloft, fuel range, true air
speed, and density altitude calculation.

I-2 Revision A
February 28, 1997
 Introduction

Safety First
Trimble has designed and built the Trimble 2101 I/O Approach Plus
GPS Navigator with all possible care. Many factors, however, can
affect aircraft safety. Please observe the following precautions.

Follow the fundamental rule of aircraft navigation: NEVER RELY ON

A SINGLE NAVIGATION SYSTEM! Errors or malfunctions are always
possible in any system, and double-checking navigation information
should be a standard procedure.

Maintain the Trimble 2101 I/O Approach Plus GPS Navigator and
other equipment properly to ensure that it operates according to
specifications.

Update the Jeppesen database card regularly for the most current
information. Jeppesen issues an update approximately every 28
days. See the Jeppesen subscription packet enclosed with the
Trimble 2101 I/O Approach Plus GPS Navigator or refer to the
subscription form in this manual for information on subscribing to
this update service.

The Trimble 2101 I/O Approach Plus GPS Navigator has a wealth of
features and information. But remember the most important rule of
flight: SEE AND BE SEEN.

Other Things You Should Know

Warranty Information

Be sure to fill out and return the Registration and Warranty Card as
soon as you purchase your unit. The tear-out card is located at the
front of this guide. When you return this card, we will send you a
complimentary copy of Trimble’s GPS: A Guide to the Next Utility.

Revision A I-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

Service Information

Authorized service for your Trimble 2101 I/O Approach Plus GPS
Navigator is available by returning the unit to Trimble or a Trimble-
authorized repair center. Any customizing of the unit will be erased
during system servicing (i.e., Serial Setups, Flight Plans, User
Waypoints, Personal Messages). If you have purchased the optional
flight planning and configuration software, be sure to save your
customized settings so they can be restored when the unit is
returned to you. To return the unit directly to Trimble, send it to:

Trimble
2105 Donley Drive
Austin, Texas 78758
Attn: Service Department
Phone: (512) 432-0400
FAX: (512) 836-9413

Quick Reference Card

A Quick Reference Card is included with this guide. The card

summarizes the steps required to perform frequently used Navigator
functions. Once you become familiar with the operation of your
Trimble 2101 I/O Approach Plus GPS Navigator, this card will be a
helpful reminder.

Installation Manual

Installation information for your Trimble 2101 I/O Approach Plus GPS
Navigator is contained in a separate Installation Manual that came
with the unit. The person who installs your Navigator—probably your
dealer—will use this manual to install the unit in your aircraft.

Jeppesen Database - General Use

The navigation database used with the Navigator is produced by

Jeppesen NavData Services. The International database card
provides access to data on Airports, VORs, NDBs, Intersections, and
Airspace Boundaries. The North American database card also
includes MSAs. Both the North American (part number 81461-10)
and International (part number 81461-11) database cards are
required for complete worldwide information. Any card other than the
these will cause the message:
êDATAêBASEêCARDêTYPE
êêêêêêNOTêVALID

I-4 Revision A
February 28, 1997
 Introduction

This database information is quite reliable. However, NDB and

intersection identifiers are not unique! About 120 NDB and Intersec-
tion identifiers are repeated anywhere from two to five times in the
Jeppesen database. Therefore, it is important to double check
waypoint information.

Users finding incorrect information in the database are encouraged

to call Jeppesen NavData Services at (303) 799-9090 and report a
Trimble database problem.

This guide includes additional information about database features

in the section where they are introduced.

Jeppesen Database - International Use

Database coverage for International airspaces is limited. For

example, there are no UNI frequencies available in the International
database. Also, information on Restricted Airspaces and MSAs is
not currently available for International airspaces. Contact Jeppesen
NavData Services for complete information on International cover-
age.

Altitude Sources

The Trimble 2101 I/O Approach Plus accepts altitude data from
several sources including:

• encoder altitude (pressure) through a serializer

• Baro or Pressure from an ARINC 419 Airdata computer
• Baro or pressure from an ARINC 429 Airdata computer
• Baro or pressure from an ARINC 407 synchro transmitter

See your Flight Manual Supplement for the type used in your installa-
tion.

Heading Sources

The Trimble 2101 I/O Approach Plus accepts heading data from the
aircraft compass system. See your Flight Manual Supplement for the
type used in your installation.

Revision A I-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

True Airspeed Sources

The Trimble 2101 I/O Approach Plus accepts True Airspeed (TAS)
data from:
• ARINC 419 Airdata computer
• ARINC 429 Airdata computer
• Synchro TAS in several formats

See your Flight Manual Supplement for the type used in your installa-
tion.

Wind Calculation

The Trimble 2101 I/O Approach Plus automatically computes winds

aloft when provided both heading and TAS.

Air and Fuel Data Computer

The Navigator is compatible with the ADC-200 Air and Fuel Data
Computer, produced by the Shadin Co., Inc., which supplies fuel
flow, pressure altitude, outside air temperature, and indicated air
speed to the Navigator for the calculations. When coupled with an air
and fuel data computer, the Trimble 2101 I/O Approach Plus can
automatically calculate:

• fuel remaining
• flight time remaining
• fuel to destination
• fuel efficiency
• fuel consumed
• density altitude
• true airspeed
• wind direction
• wind speed
• crosswinds

I-6 Revision A
February 28, 1997
 Introduction

About This Guide

This guide is designed to get you up to speed as quickly as possible
using the Trimble 2101 I/O Approach Plus GPS Navigator.

This manual is valid for the software version indicated on the title
page. An alpha character in the parentheses indicates a minor
modification to the initial software release. Revisions are indicated
with the letters A-Z. For example, 241(A) is a revision to software
version 241.

Chapter 1, Getting Started, is an introduction to the Trimble 2101 I/O

Approach Plus GPS Navigator, including physical descriptions of
components, their uses and functions.

Chapter 2, Using the Navigator, contains basic operating instruc-

tions for data entry, direct-to, and flight plan activation.

Chapters 3-9 include detailed information on the Trimble 2101 I/O

Approach Plus GPS Navigator modes, displays, and functions.

The Appendices include detailed information about GPS technology

and are followed by a glossary and an index.

You may also wish to use the Trimble 2101 I/O Approach Plus GPS
Navigator’s Demo capability, which lets you try out many of the unit’s
functions while on the ground. Instructions for using the Demo
feature are in Chapter 8.

Revision C I-7
August 25, 1997
TRIMBLE 2101 I/O Approach Plus

This page intentionally left blank.

I-8 Revision A
February 28, 1997
 Chapter 1 Getting Started

Chapter 1
Getting Started
The Trimble 2101 I/O Approach Plus GPS Navigator is a powerful
navigation management system designed for simple operation.
Chapter 1 introduces the user to the primary components and the
major functions of the Trimble 2101 I/O Approach Plus GPS Naviga-
tor.

This chapter covers:

• Information Displays
• Keys
• Selector Knobs
• Annunciator Lights

Revision A 1-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

1.1 The Navigator Components

The front panel of the Trimble 2101 I/O Approach Plus GPS Navigator
includes six components:

• Jeppesen database card slot

• A power switch
• The LED display
• The function keys
• Two selector knobs
• Annunciators

1-2 Revision E
April 27, 1998
 Chapter 1 Getting Started

1.2 The Jeppesen Navigation Database

The Navigation Database, produced by Jeppesen NavData Services,
is a sophisticated product, providing access to reliable, worldwide
data on Airports, Approaches, SIDs, STARs, VORs, NDBs, Intersec-
tions, and Airspace Boundaries. The North American and Interna-
tional database cards together provide complete worldwide informa-
tion. The NavData Database Card contains the following information
(see exceptions below on the International Database Card):

Reported Public-Use Airports and Military Bases with Runways

of 2000 Feet or Greater
• Identifier, City Name, State/Country, Facility Name
• Runway Number, Length, Width and Surface Type (Hard,
Gravel, Turf, or Soft), Traffic Pattern Direction
• Field Elevation and Beacon Availability
• Lighting Availability on at Least One Runway
• IFR Approach, Aircraft Services Availability
• ATIS, Approach, Tower, Ground, CTAF and Unicom
Frequencies (when multiple frequencies exist, only one
is given). Range of 118.00 to 136.975 for Com frequen-
cies.
• Latitude and Longitude
Approaches

• Airport Identifier associated with Approach

• Approach Name (with Runway when applicable)
• Initial Approach Fixes (IAFs) and Transitions
• DME Arcs
• Approach Waypoints with Type Identifiers (IAF, FAF, MAP,
MAHP, Intermediate Waypoints)

Revision A 1-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

• Latitude and Longitude of Approach Waypoints

Standard Instrument Departures

• Airport Identifier associated with SID

• SID Name
• Applicable Runways
• SID Transitions
• SID Waypoints
• Latitude and Longitude of SID Waypoints
Standard Terminal Arrivals

• Airport Identifier associated with STAR

• STAR Name
• STAR Transitions
• STAR Waypoints
• Latitude and Longitude of STAR Waypoints
VORs and NDBs

• Identifier, City Name, State/Country, Facility Name

• Frequency (range of 180 to 713 KHz for NDBs; range of
108 to 117.95 for VOR frequencies) and Morse Code for
identifier
• Latitude and Longitude
Intersections

• Name and Region

• Latitude and Longitude
Minimum Safe Altitudes

Controlled Airspace Advisories and Frequencies

• Nearest Controlling Agency and Frequency (when

multiple frequencies exist, only one is given)
Note that the International NavData Database Card does not contain
Unicom frequency information, nor Minimum Safe Altitudes.

1-4 Revision A
February 28, 1997
 Chapter 1 Getting Started

Information provided is as reported by governing agencies and

Jeppesen. The database information is provided as a reference and
is not to be solely depended upon for navigation communication,
takeoff, landing, or guidance. Depending on the reporting agency,
some information may be missing or inaccurate. Also, the Interna-
tional Database may be missing certain classes of data and does
not contain minimum safe altitudes. Always check local agency
documents for full and correct information.

CAUTION

When executing terminal area procedures (SIDs, STARs and

Approaches), note that the Navigator database will contain all the
waypoints associated with those procedures, but not necessarily all
the legs. For example, a missed approach procedure may require
the pilot to fly runway heading to 3000 feet, then turn left to intercept
an inbound course to the Missed Approach Holding Point (MAHP).
For this procedure, the navigator will have only the identifier and
coordinates of the MAHP, not the procedures for arriving at it. The
pilot should always consult the appropriate publication to ensure the
procedure is flown correctly.

Revision A 1-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

1.2.1 NavData Card

Insert the card into the Navigator with the gold contacts facing up.
The card will slide smoothly into the slot when properly inserted. If it
does not, remove the card and verify the orientation.

The NavData card supplied with your Navigator was current when the
unit was shipped from the factory. The data on the card is updated
every 28 days by Jeppesen, so it is important to monitor the expira-
tion date. To receive database updates, complete the subscription
form enclosed with the system or use the form located in the front of
this guide.

If the card is not present at power-on, you will receive a “DATABASE

MISSING” message. If the card has expired you will get a “DATA-
BASE EXPIRED” message.

WARNING
Removing the data card with power applied cancels the active flight
plan. The Navigator displays the message

êDATAêCARDêREMOVEDê

êREPLACEêTOêRESTART

êDATAêCARDêREMOVEDê

êFPLêCANCELLED

until a card is reinserted, at which time the unit restarts.

1-6 Revision E
April 27, 1998
 Chapter 1 Getting Started

1.3 The Power Switch

The Navigator has one power switch, located at the top of the unit.
To activate the unit, turn the power switch to the ON position.

When the power is turned on, the Navigator performs self-diagnostic

tests and begins its automatic position initialization. When these
tests are completed the Fuel on Board message appears. Refer to
Section 2 for information on completing initialization.

1.4 The LED Display

The Navigator displays information on a two line LED screen. The
displayed information varies, depending on the selected mode. For
example, a typical NAV mode display looks like this:

ŽLAX®ê120­ê143¡ê0:34
{ÒÞÒÞÛÞÒÞÒ}Ÿ124­250‹

The top line of the display indicates that to the Los Angeles Airport,
bearing is 120°; distance is 143 nautical miles; estimated time en
route is 34 minutes. The bottom line indicates that the CDI is
centered; current track is 124°; current ground speed is 250 knots.

The LED screen features automatic dimming. The screen intensity

is automatically adjusted based on the ambient light.

Revision E 1-7
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

1.5 Operation Overview

The pilot controls the operation of the Navigator with the KEYS and
the SELECTOR KNOBS. ANNUNCIATOR LIGHTS alert the pilot of
system messages, current navigation mode, and parallel track
selection.

• The Mode Keys select a major function category.

• The Function keys provide specific operations.
• The Selector knobs are used to control the display and
modification of information.

Mode Keys, Modes, Knobs, and Data Pages

The Navigator’s operation is organized into MODES,
FUNCTIONS, and DATA PAGES. You may access these functions
using the keys and knobs.

A Mode Key provides access to the navigator’s modes, or states. The

nine keys are:

The navigation key is used to view navigation and

position information along your selected route.

The waypoint key is used to view information such

as bearing and distance, runway, name, frequen-
cies, and position.

The flight plan key is used to view the active flight

plan, stored flight plans, and to build and edit flight
plans.

The calculator key enables you to perform fuel and

airdata computations.

The auxiliary key is used for a variety of functions.

Use it to view system information such as date,
time, and GPS receiver status. Use it to view your
custom checklist, set a parallel track offset, and
select data base search regions.

1-8 Revision A
February 28, 1997
 Chapter 1 Getting Started

The nearest key is used to view information about

the 20 nearest airports, approaches, VORs,
Agencies, NDBs, intersections, and user
waypoints.

The direct-to key is used to change your flight path.

Use it to fly direct to any waypoint in the data base
and to activate a flight plan.

The message key is used to view system mes-

sages and to display your current CDI scaling.

The enter key is used for data entry. Press it to

obtain a flashing cursor in an editable data field.

The Selector knobs are used to control the display and edit informa-
tion.

The small, inner knob is used to change the top

line of the display or to change data under the
cursor.

The large, outer knob is used to change the bottom

line of the display, to advance the cursor within a
data field, and to advance the cursor between data
fields.

A key may have one or more modes. The Navigator displays mode
names bracketed by asterisks. For example, the System Status
mode of the AUX key is displayed as *SYSTEM STATUS*.

A mode may have one or more DATA PAGES. Data pages may
display status information about the Navigator, or contain data fields
that may be edited.

A data page may also have additional information displayed either on

a secondary data page or on the upper or lower line of the current
page.

Revision B 1-9
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

Selecting Keys, Modes, and Data Pages

When pressed, the key lights to indicate that it is the active key, and
one of the modes of that key is displayed. Pressing the key again
displays the next mode, and so on. When the last mode is reached,
pressing the key again will cycle back to the first mode.

If the displayed mode contains data pages, then rotating the

sequences through the data pages. If a data page has additional
information related to the current data page, this may be displayed by
turning the . The additional information may be a secondary data
page, or another line of data on the current data page.

When the last data page is reached, rotating the in the opposite
direction sequences back through the data page, or to another line of
data on the current data page.

1.5.1 Basic Operating Principles

The following principles apply to all Navigator functions:

Selects displayed Waypoint, Procedure, or Flight Plan for

activation.
(1st Press)

Activates course steering as selected

(abort by pressing the NAV key).
(2nd
Press)
Opens any editable field on displayed page.

(1st Press)

Accepts entered data.

(2nd
Press)
Press a key (NAV, WPT, FPL, CALC, AUX, NRST) multiple
times to select desired mode. Hold for 1 to 1½ seconds
to return to Primary page of key.

1-10 Revision A
February 28, 1997
 Chapter 1 Getting Started

Use the small, inner selector knob to:

• Change any editable field (course, distance, or
procedure) located within angle brackets “< >.”
(small,
inner • Change alphanumeric or available option/function of
selector selected field while editing.
knob)
• Scroll through Primary pages and top lines of dis-
played mode.
Use the large, outer selector knob to:
• Move between editable fields on displayed page.

(large, • Scroll through Secondary pages and bottom lines of

outer displayed mode.
selector
knob)

Entering Information

Some data pages contain editable fields. The and key

are used to enter or change information on a data page. To do this:

• Rotate the to select the desired data page of the

active function.

• Press to initiate editing.

• Rotate the to move within the data field.

• Rotate the to edit information in the data field.

• Press to complete the data entry.

Revision A 1-11
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

1.5.2 The Internal Annunciator Lights

The internal Annunciator Lights are located below the LED display.
They are visible only when lit.

MSG APR HLD PTK WPT

The MSG annunciator light flashes when there is a

MSG message to view. If there are multiple messages
that you have not yet viewed, the light continues to
flash until all messages have been viewed. After
all the messages have been viewed, the MSG
annunciator light stops flashing. If the condition that
caused the MSG remains, the MSG annunciator
remains illuminated.

CDI scaling settings are always available under the

MSG key.

If the Navigator is wired to your audio panel, you will

hear a beeping tone anytime the MSG annunciator
is flashing.

(Details of the various Navigator messages are

presented in Chapter 9.)

WPT The Waypoint annunciator light alerts you to

waypoint arrival. When approaching the active
waypoint, the light will illuminate with the lead time
as determined by the sum of the selected lead time
and the computed turn anticipation time. Lead time

1-12 Revision A
February 28, 1997
 Chapter 1 Getting Started

is set using the Auxiliary key, Configure mode, with

the factory set default equal to 10 seconds. Turn
anticipation time is computed by the Navigator
based on the course difference between the
current leg and the next leg, assuming a standard
rate of turn. If the waypoint is the last waypoint, turn
anticipation time is zero.

PTK The Parallel Track annunciator is on when you

have selected a track parallel to the current leg’s
track. Press the key to view the selected
offset.
HLD
The Hold annunciator light alerts the pilot that the
Active Flight Plan is suspended at the current Active
Waypoint
APR The Approach Annunciator comes on at 2 nm
inbound to the Final Approach Fix (FAF) when all
Approach requirements are met. The require-
ments are: an Approach Profile is Activated,
Approach mode is Enabled, Approach RAIM is
predicted to be available at the FAF and MAP, and
the aircraft is located between the FAF (from 2 nm
inbound) and the MAP at or near the final approach
course.
NOTE:

The RAIM and GPS internal annunciator lights have no function in

software versions -241 and higher.

Revision C 1-13
August 25, 1997
TRIMBLE 2101 I/O Approach Plus

This page intentionally left blank.

1-14 Revision A
February 28, 1997
 Chapter 2 Using the Navigator

Chapter 2
Using the Navigator
The Navigator operating procedures are designed to minimize the
pilot memory items and to behave consistently across all operating
modes and pages. This manual uses several naming conventions
for repetitive items.

Navigator Refers to the Trimble 2101 I/O Approach

Navigator.
Selector Knobs Refers to the two concentric knobs on the
face of the Navigator.
Key Refers to any of the keys on the face of the
Navigator.
Mode Navigator functions accessed by pressing
a key.
Page Data within a function, accessed by
rotating the knobs.
Waypoint A single point, such as a VOR, NDB or
Airport.
Procedure A collection of waypoints such as SIDs or
STARs and Approaches.

Revision A 2-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

2.1 Power-Up
To activate the Trimble 2101 I/O Approach GPS Navigator, rotate the
power switch located at the right side of the unit to the ON position.
The Navigator automatically executes a self-test, displaying the
results on the screen.

As part of the self-test process, the Navigator performs a lamp test

that illuminates:

• all internal annunciators

• all external annunciators
• all keys
When the self-test is complete, the Navigator displays the last
computed fuel quantity value.

• If the value is correct, press any key to begin Navigation.

or
• If the fuel value is incorrect, use the selector knobs to
enter the correct value.

• Press to complete the entry.

2.2 ENT Key

The key is used to begin and end all data entry.

• Press to open a field.

• Use the Data Selector Knobs (described next) to change

or select the data.

• Press to close the field.

2-2 Revision E
April 27, 1998
 Chapter 2 Using the Navigator

2.3 Data Selector Knobs

The concentric selector knobs have two operating modes: page
selection and data entry.

2.3.1 Page Selection

Most Navigator modes have more than one page of data available.
The selector knobs are used to change the top and bottom display
lines.

• Use the knob to change the top line of the display.

• Use the knob to change the bottom line of the

display.

2.3.2 Data Entry

Data selection is accomplished using the key and the selector
knobs.

• Use the knob to move the cursor within a field and to

move from field to field.

• Use the knob to change the data under the cursor.

• Press the key to complete the entry.

Some data fields, such as procedure names, have chevrons (< >)
around them. You may change the data in these fields by simply
rotating the knob. You do not need to press to open and
close the field; although that also works.

Revision A 2-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus
2.4 Direct-to Key
The key is used to change your flight path. Use this key to fly
direct-to any waypoint in the data base, enter a holding pattern and to
activate a stored flight plan.

This key requires two consecutive presses to change your flight path.
After the first press, review the data on the display screen. Note the
proposed course and waypoint. Change the course as desired
(course for a “join leg” is fixed by the leg waypoints and cannot be
changed). For reference, set your CDI or HSI to the proposed
course. Once you are satisfied with the proposed flight path change,
press the key a second time to execute the change. The Navigator
will automatically change to the Primary Navigation page.

Use to set course

JOINêLEGê229­êBATSN° FLYêCOURSE<086­>-Dº
TOêBUMBY° êêêêêêêGUO¶

If you did not change the course offered by the Navigator after the first
key press, the Navigator centers the CDI. If you selected a
course to/from the waypoint, the Navigator will deflect the CDI as
appropriate to the aircraft’s position relative to the selected course.

Press instead of the second press to abort without

changing your flight path.

If you select direct-to a waypoint from a waypoint mode while you are
on an active flight plan, the navigator will cancel the flight plan on the
second press. In this circumstance, notice the display after the
first press contains the phrase “...& CANCEL FPL”.

FLY COURSE<010­>-Dº
ADS® & CANCEL FPL

2-4 Revision B
May 12, 1997
 Chapter 2 Using the Navigator
To change your flight path:

• Select a waypoint from , or from , or a flight

plan from .

• Press .

• To change the course, use the knob.

• Set your CDI or HSI for reference to the new course.

• Press to execute.

• Press to abort without changing your flight path.

2.5 Mode Restore

To return the , , , , or key to the
power-on default mode, press and hold the key for at least 1 second.
No data is lost or affected by this action.

Revision E 2-5
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

2.6 Entering a Flight Plan

This section explains step-by-step how to enter a flight plan. The flight
for this example is from Austin, Texas (KAUS) to Ft. Worth, Texas
(KFTW). The following are waypoints on this route:

AUSA
AUSV
GROWNI
EDDEEI
SARGEI
MCDONI
ACTV
SLUGG1STAR
FTWA
The steps for entering this sample flight plan follow:

• Press until the display says, STORED FLIGHT

PLAN or NO STORED FLIGHT PLAN.

• Turn either the or the until the display says,

ADDêNEWêFLIGHTêPLAN
startê++end

• Press .

When is pressed, the right plus symbol (+) on the bottom line
becomes a flashing field ready for editing. Select the waypoint type (A,
_APRCH, _SID, _STAR, V, N, I, or ualpha) here. In this sample flight
plan, the first waypoint to be entered is an airport, AUS. So the
flashing letter on the bottom line must be an “A”.

Rotate to select
waypoint type.

ADDêNEWêFLIGHTêPLAN
startê+®êêêêê-end

2-6 Revision A
February 28, 1997
 Chapter 2 Using the Navigator

• If necessary, turn the to change the flashing character

to an “A”.
Folow the steps to enter the waypoint identifier, AUS.

• Turn the to move the cursor to the next field so that

you can select the airport identifier.

• Turn the to display “A”.

• Turn the to move the cursor to the next field.

• Use the to select “U”.

• Turn the to move the cursor to the next field.

• Turn the to select “S”.

ADDêNEWêFLIGHTêPLAN
startê+®AUSêê-end

• Press to complete the entry and add AUS to the

flight plan.

EDITêFLIGHTêPLAN
AUS®êê++end

The next waypoint is the AUS VOR. Therefore, the flashing letter on
the bottom line must be v.

• Press to enter the next waypoint.

• Turn the until the flashing character is a “V”.

• Turn the to move cursor to the next field.

• Turn the and alternately to select characters “A”,

“U”, and “S” for the AUS VOR.

• Press to complete entry of the waypoint.

Revision A 2-7
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

The intersections must be entered next.

• Press to begin entry of the next waypoint, GROWN

intersection.

• Turn the to select

waypoint type.

EDITêFLIGHTêPLAN
AUS®êê+Iêê-end

• Turn the until the flashing letter is an “I” for intersec-

tion.

• Turn the to move the cursor to the next field.

• Turn the to select the letter “G” for the GROWN

intersection.

• Alternate turning the to move the cursor to the next

field and the to select the remaining letters in
GROWN.

• Press to complete this entry.

Repeat the steps for entering GROWN to add the remaining intersec-
tions (EDDEE, SARGE, and MCDON).

Add the ACT VOR.

• Press to begin entry of the VOR.

• Turn the to change the flashing waypoint type to a “V”.

• Turn the to move the cursor to the next field and the
to select the letters of the identifier, ACT.

• Press to end this entry.

2-8 Revision A
February 28, 1997
 Chapter 2 Using the Navigator

After ACTV, add the destination airport, then the _STAR.

• Press to begin entry of the destination airport.

• Turn the to change the flashing waypoint type to an

“A”.

• Turn the to move the cursor to the next field and the
to select the letters of the identifier, FTW.

• Press to end this entry.

• Press to begin entry of the STAR.

Rotate the to select

the procedure type.

EDITêFLIGHTêPLAN
ACT·ê+_STARêê-end

• Turn the until flashing field is _STAR.

• Press .

The Navigator chooses the first STAR associated with your destina-
tion, FTW. To select other STARS for FTW, use the .

• Turn the to select SLUGG1.

• Press . (There is no prompt for this step. The

key will not be flashing.)

Revision A 2-9
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

Select a transition.

• Turn the to select the ACT transition.

• Press .

• Press to add a STAR to the flight plan.

• Press to complete the FPL editing process.

• Turn the counterclockwise until LEG 1 is displayed in

the lower left.

AUS®ê-ºFTW®êêêêê176¡
LEGê1:êAUS®êêêêŽAUS·

• Press , to activate the flight plan. (The

key will not flash to prompt you.)
On the successful conclusion of these steps, the flight plan has been
entered and activated.

2-10 Revision A
February 28, 1997
 Chapter 3 Approaches

Chapter 3
Approaches
The Trimble 2101 I/O Approach Plus Navigator allows you to fly non-
precision approaches to airports with published GPS-overlay and
GPS-only approach procedures from data stored on the NavData®
card. GPS overlay approaches, while identical to the underlying VOR
or NDB procedure, provide greater accuracy and continuous course
and distance information not available otherwise. GPS-only ap-
proaches, unlike VOR or NDB based approaches, can be designed
such that the final approach course is aligned with runway heading.

The 2101 I/O Approach Plus allows you to fly precision approaches
when the aircraft is equipped with Differential Global Positioning
System (DGPS) equipment and GPS software 241C or later.

Revision E 3-1
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

3.1 What is a GPS Approach?

A GPS approach is a sequence of waypoints linked together just like
a user-created flight plan , except that the TSO C-129 standards
require that a GPS approach be extracted from the NavData® card as
a single procedure. You may delete or replace this procedure, but
you cannot edit this procedure.

Every GPS approach must have at least two waypoints; a Final

Approach Fix (FF) and a Missed Approach point (MA). Most have a
Missed Approach Holding (MH) point or other missed approach
point.

Many approach waypoints are unnamed on the published Terminal

Procedures. These include waypoints like DME positions, intersec-
tion of two radials, DME arc end points, etc. In addition, many overlay
approaches need a Final Approach Fix to comply with TSO C-129(A1)
requirements. Some Jeppesen approach charts depict these
waypoint names; NOS charts do not. Until all the published charts
depict the waypoint names, you must correlate the Jeppesen
NavData information displayed on the Navigator with the published
procedures to ensure proper interpretation of the waypoint identifiers.

The most common waypoint names are:

RWxx Runway xx threshold missed approach

waypoint.
MAxx Runway xx missed approach waypoint.
Drrrd DME arc waypoint defined by a radial and
a distance from the arc reference VOR. In
this convention, rrr is the FROM radial in
degrees and d is a letter of the alphabet
representing the distance in nautical
miles. For example, A=1nm, J=10nm.
CFxx or CFxxx Course fix waypoint for a runway xx or VOR
radial xxx.
FFxx or FFxxx Final approach fix for a runway, xx or radial,
xxx.
NxxHP NDB approach runway xx intermediate
holding pattern waypoint.

3-2 Revision A
February 28, 1997
 Chapter 3 Approaches

To aid in identifying approach waypoints, the Navigator displays

subscripted letters after the identifier to indicate the waypoint type.

IF Initial Approach Fix.

I Intermediate Fix (Intersection available in
WPT).
W Intermediate Fix (Terminal waypoint not available in
WPT)
FF Final Approach Fix.
MA Missed Approach Point.
MH Missed approach Holding point.
DM DME arc reference waypoint.
The 2101 I/O Approach Plus accomodates procedure turns and
holding pattern course reversals. These legs are depicted in the
flight plan as:

PTURNR
HOLDL
The subscripted letters R and L indicate turn direction.

For software versions 241B and later, the subscripted letters L and R
are not displayed with procedure turns.

3.2 The Basic Rules of GPS Approaches

There are two types of GPS approaches: overlay and GPS. Overlay
approaches are based on existing procedures. GPS approaches
are new approaches designed specifically for GPS. You fly both
types exactly the same according to the following rules.

• The approach must be on the NavData® card and the

card must be current.
• You may select the approach at any time prior to reaching
the final approach fix.
• You may join the approach at any point or leg in the
procedure except you may not join the FAF-MAP leg or
select direct-to the MAP. Both are prohibited by the TSO.
If you attempt to do either, the Navigator will offer the final
approach course to the FAF instead.

Revision E 3-3
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

• Enroute, the CDI is 5 nm full scale. Within 30 nm of the

MAP, the CDI is 1 nm full scale. On the FAF-to-MAP leg,
the CDI is 0.3nm full scale. You can view the CDI scaling
at any time under the key.
• Within a 30 nm radius of the airport, the Trimble 2101 I/O
Approach Plus prompts you for the barometric setting.
Enter the barometric setting and press to enable
the approach. If you do not enable at this time, the unit
prompts you again at 3 nm from the FAF. If you do not set
it at this point, the GPS will not illuminate the approach
annunciator at the FAF.
• The distance and bearing displayed on the Trimble 2101
I/O Approach Plus is always relative to the current TO
waypoint.
• If the green APR (approach) annunciator is not on at the
FAF, execute the published missed approach procedure.
• If you are off course on the FAF to MAP leg, do not use the
, key sequence to center the CDI. This will
cancel the approach and begin the missed approach
sequence.
• When flying the missed approach, fly all procedures and
observe all altitude restrictions as published on the
printed charts.

3.3 How to Select the Approach

There are two ways to select an approach with the Trimble 2101 I/O
Approach Plus. You can add an approach procedure to a flight plan
or select one from . When you add an approach procedure to a
flight plan, the Trimble 2101 I/O Approach Plus places the procedure
at the end of the flight plan, replacing the destination airport, if it was
specified. If you select an approach procedure from WPT, the Trimble
2101 I/O Approach Plus treats this procedure as any other flight plan,
except that it prohibits editing of the procedure.

To insert an approach into the active flight plan:

• Press to get to the active plan display. Note: If you

press and hold the key for one second, the unit will
display the active plan and active leg.

3-4 Revision E
April 27, 1998
 Chapter 3 Approaches

• Press twice to open the flight plan for input. Note: It

does not matter where you insert the approach, the
Trimble 2101 I/O Approach Plus will place it at the end of
the flight plan.
• If the approach modifies the active leg, you will be
prompted to press to cancel the flight plan and
modify the active leg.

• Rotate to _APRCH then press . The Trimble

2101 I/O Approach Plus presents the approaches for
your destination airport. (Note: If the flight plan has no
destination airport, the Navigator presents the approach
for the last airport you viewed in WPT or NRST. In this
case, press , use the selector knobs to choose the
desired airport identifier, then press to complete
the selection.)

• Rotate to display the desired approach. Press

and rotate to select the desired transition. Press
to complete the selection.

• Press to insert the approach into the approach

flight plan.
• To select a different leg or reactivate the flight plan, rotate
the knob counter-clockwise until the desired leg is
displayed.

• Press twice to join that leg.

To activate an approach from the WPT mode:

• Press repeatedly to get to the APPROACH mode.

• Press then rotate and to select the desired

approach and transition.

• Press twice to activate the approach. Note: This

cancels the active flight plan and provides guidance
direct-to the first waypoint of the approach.
Once the approach is activated, the primary NAV page is displayed.
To review the procedure, press and use the knob. Note:
The first leg is –D–> IAF, indicating direct-to the initial approach fix.

Revision E 3-5
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

3.4 How to Join an Active Approach in the Middle

When you are receiving radar vectors, it is common to join the
approach at some intermediate leg or waypoint, or intercept the final
approach course inbound.

To join an active approach leg:

• Press to view the active flight plan.

• Use the knob to view the desired leg (A to B).

• Press once. If you want to join the leg, press

again. If you want to proceed direct-to either end of the
leg, use the knob to select the waypoint then press
again.

Note: You may join the approach at any point or leg in the
procedure except you may not join the FAF-MAP leg or
select direct-to the MAP. Both procedures are prohibited
by TSO C-129.
To join the final approach course inbound or proceed direct-to the
FAF.

• Press to view the approach page. If the desired

approach is not the one in the display, press and
use the and knobs to select it.

• For direct-to the FAF, rotate the knob one click to the
left.
• To intercept the final approach course inbound, rotate the
knob two clicks to the left.

• Press twice.

3-6 Revision A
February 28, 1997
 Chapter 3 Approaches

3.5 How to Enable the Approach

Once you have selected an approach and are within 30 nm of the
airport, the Navigator prompts you to input the barometric setting and
enable the approach. If you did not enable the approach when
prompted 30 nm from the airport, the Navigator will prompt you again
3 nm from the FAF. If you ignore this prompt, the Navigator will not
illuminate the Approach light.

APPROACHêENABLE?êENT
BARO:ê30¤ê

Enter the baro setting then press to enable the approach.

APPROACHêENABLED
BARO:ê30¤ê

The Navigator uses the barometric setting to correct the pressure

altitude received from the aircraft altitude encoder. The Navigator
uses the altitude information when there are insufficient satellites
available to do RAIM or 3D (4 satellite) navigation.

If your installation provides baro altitude to the Navigator, this screen

will display the altitude in place of the baro setting, and the approach
will enable automatically when you are within 30 nm of the airport.

3.5.1 View APPROACH ENABLE Status

Once you are within 30 nm of your destination airport, you may view
the Approach Enable status by pressing the key.

If you have already enabled the approach, the bottom line of the
display alternates between displaying the baro setting and the name
of the selected approach.

Revision B 3-7
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

3.5.2 Update the Baro Setting

To update the baro seting after you have enabled the approach:

• Press to view the APPROACH ENABLE status.

• Press .

• Use the selector knobs to change the baro setting.

• Press .

3.5.3 Disable the Approach

If, for any reason, you want to disable the approach after you have
enabled it:

• Press to view the APPROACH ENABLE status.

• Press .

• Use the knob to select the ENABLED field.

• Use the knob to select DISABLE.

• Press .

3.6 How to Perform a Course Reversal

The Navigator Plus supports three types of course reversals associ-
ated with non-precision approaches: procedure turn course reversals,
holding pattern course reversals, and teardrop course reversals. For
procedure turn course reversals, it provides a course outbound prior
to the reversal and a course inbound once the reversal has been
executed. For holding pattern course reversals, it provides a course
inbound to the hold point.

3-8 Revision A
February 28, 1997
 Chapter 3 Approaches
3.6.1 Procedure Turn Course Reversals
The Navigator Plus provides guidance outbound to the procedure
turn, prompts you with the outbound heading, then, once you have
turned inbound, automatically track-changes to the inbound course.
No operator intervention is required. No hold annunciator will illumi-
nate.

Once you have passed the IAF, the Navigator Plus automatically
provides an outbound course to the procedure turn. As you cross the
p-turn point outbound, the GPS displays an advisory message to
execute the procedure turn:

EXECUTEêP-TURN
TURNêTOêXXX

where XXX is the procedure turn outbound heading. Press to

acknowledge this prompt. Fly the procedure turn manually, noting that
the GPS CDI is providing guidance relative to the outbound course.
As you turn to within 80 degrees of the inbound course and are at
least 3nm out from the FAF, the GPS provides guidance inbound.
Thereafter, the GPS provides guidance through the remainder of the
approach.

Revision A 3-9
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

3.6.2 Holding Pattern Course Reversals

The Navigator Plus provides guidance to the holding pattern hold
point and then guidance along the holding course back to the
holding fix. No operator intervention is required. No hold annunciator
will illuminate.

As you pass over the holding fix the first time, the Navigator track-
changes to show published course guidance inbound to the fix:

EXECUTEêHOLDêPATTERN
êTOêINBOUNDêCRSêXXX­

where XXX° is the inbound course to the holding fix. Press to

acknowledge this prompt. Fly one turn through the pattern, using
standard entry procedures. As you pass over the fix for the second
time, the Navigator automatically sequences to the next waypoint in
the approach. Thereafter, the GPS provides guidance through the
remainder of the approach.

To remain in the holding pattern, follow the instruction found in section

5.11 Holding Patterns.

3-10 Revision A
February 28, 1997
 Chapter 3 Approaches

3.6.3 Teardrop Course Reversals

The Navigator Plus provides guidance outbound from the teardrop fix
along the outbound leg. When the distance outbound from the fix is
greater than the length of the inbound leg, the GPS provides a course
inbound. Thereafter, the GPS provides guidance through the remain-
der of the approach.

3.7 How to Fly a DME Arc Approach

Flying a DME Arc Approach is just like flying a flight plan. Simply
keep the CDI centered while the Navigator provides precise guid-
ance along the curved path of the DME Arc leg. You can fly direct to
either Arc endpoint or choose to join the Arc along its length.

The Navigator does make distinctions between curved DME Arc legs
and normal (straight) legs. While on the Arc leg, the Primary Nav
page displays information relative to the DME arc and relative to the
TO waypoint (the end point of the Arc).

Revision A 3-11
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

3-12 Revision E
April 27, 1998
 Chapter 3 Approaches

While on the Arc leg, the top line displays:

• Bearing and distance from present position to the end of

the arc.
• Desired Track. This is a line tangential to the curved line
of the arc, updated as you progress along the arc.
While on the Arc leg, the bottom line displays:

• Course Deviation (XTK) relative to the curved path of the

arc.
• Identifier of the DME Arc reference station.
• Distance from the DME Arc reference station.
The waypoints of the approach in the example are named using the
conventions described previously.

D161KIF DME arc waypoint that is on the 161 degree

radial from the reference station, at 11 DME
(K is eleventh letter of the alphabet). Also the
start of the arc.
CD11W Course fix point for runway 11 at CEC. Also
the end of the arc.
ROZEYFF The final approach fix
MA11MA The missed approach point for runway 11.
The other DME Arc distinction is in the approach waypoints. The
Navigator data base contains the DME Arc reference point, indicated
by the suffix DM. This point is placed between the arc end points to
allow you to join the arc along its length.

The data base waypoints that comprise the CEC VOR/DME 11,
D161K transition are:

D161KIF - CECDM - CD11W - ROZEYFF -

MA11MA - CECMH

To intercept the DME Arc leg, use the key to join the D161KTIF
to CECDM leg or the CECDM to CD11W leg.

Revision A 3-13
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

3.8 Missed Approach

Although normal procedure would dictate selection of a Missed
Approach at the Missed Approach Point when the airport environment
is not in sight, you may elect to select Missed Approach prior to
reaching the MAP. Also, while on the FAF to MAP leg, the Navigator
may recommend execution of a Missed Approach in the event of a
RAIM loss or system failure.

3.8.1 Missed Approach Before the MAP

Once you are established on the final approach, the FAF to MAP leg,
you may execute a missed approach at any time by pressing
.

When you execute the missed approach while on the FAF to MAP leg,
the Navigator will:

• Change the CDI scale from 0.3 nm to 1 nm full scale.

• Turn on the Hold light indicting that it is not going to
sequence at the MAP waypoint.
• Provide steering TO the MAP point, thence on an out-
bound track straight out FROM the MAP.
Upon reaching the MAP, execute the published climbout procedures.

To resume sequenced steering to the Missed Approach Holding Point,

press .

3.8.2 Missed Approach Beyond the MAP

As you pass the MAP, the Navigator provides steering straight out
FROM the MAP and illuminates the key as a prompt. Waypoint
sequencing is suspended at the MAP to allow you to comply with all
published missed approach procedures before proceeding to the
Missed Approach Holding Point. To resume waypoint sequencing to
the Missed Approach Holding Point, press .

3-14 Revision B
May 12, 1997
 Chapter 3 Approaches

To execute a missed approach after passing the MAP:

• Comply with the published missed approach proce-

dures.

• Press to resume waypoint sequencing to

the Missed Approach Holding Point

3.9 How to Fly a GPS Approach

Non-precision approaches flown with the Trimble 2101 I/O Approach
Plus all follow these same basic series of events.

• Select the desired approach from the WPT mode or add

the approach procedure to the active flight plan.
• Enable the approach by entering the baro setting when
prompted by the Navigator. This prompt happens
automatically when you are 30 nm from your destination.
(The Navigator will prompt you again near the FAF if you
ignore the initial prompt.)

• Use the key and the and knobs to select

the procedure entry point. You may intercept any leg up
to the FAF - MAP leg or select direct-to any waypoint up to
the FAF.
• If the procedure is a DME arc or straight-in, your work is
done. Keep the CDI centered while the Trimble 2101 I/O
Approach Plus guides you to the MAP.
• If the procedure requires a course reversal, the Navigator
provides an outbound course prior to flying the course
reversal. As you turn inbound on the course reversal, the
Navigator automatically changes track to the inbound
course.
• Establish yourself on the final course inbound.
• Ensure the approach light is ON as you cross the FAF
inbound. If the light is not on, execute a missed approach
after passing the MAP.
• If the approach light is ON, fly to the MAP, following the
published vertical profile.
• To execute a missed approach prior to crossing the MAP,
press . Remember, always fly to the MAP,

Revision A 3-15
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

even if you went missed approach at the FAF.

• After you have crossed the MAP and complied with all
published missed approach procedures, press
to resume waypoint sequencing to the missed
approach holding fix.

WARNING!

A direct course from the MAP to the holding point may

violate the published missed approach procedure. Always
fly all missed approach procedures.

• Once you have instructed the Navigator to execute the

missed approach at or beyond the MAP by pressing
, the Navigator provides course guidance direct to
the waypoint following the MAP and waypoint sequencing
is active.
• When the TO waypoint is the missed approach holding
point (mh), the Navigator automatically illuminates the
HOLD annunciator to remind you that this is the holding
fix.
• At waypoint passage, the TO/FROM flag on the CDI
indicates FROM and the Navigator provides guidance
outbound FROM the waypoint.

• To fly the holding pattern, press , enter the published

holding course TO the waypoint using the knob.
Press . Fly the holding pattern like a VOR/DME
hold. (See Section 5-11 for instructions on holding at any
waypoints other than the missed approach holding point.)

3-16 Revision A
February 28, 1997
 Chapter 3 Approaches

3.10 RAIM
RAIM, Receiver Autonomous Integrity Monitor, is a method employed
by the computers in the Navigator to monitor the integrity of the
navigation information received from the satellites. RAIM estimates
an upper limit on the position accuracy available under the conditions
dictated by the satellites. The limit is completely dependant upon the
number of satellites in view and their relative positions in the sky
(their geometry). TSO C-129 specifies three RAIM limits: En route,
Terminal and Approach.

The Navigator applies the more stringent Terminal limit to both the en
route and terminal flight phases. It applies the Approach limit to the
approach phase.

The satellites transmit information, called almanac data, about their

orbital positions and health. The Navigator uses the almanac data to
predict the available satellite coverage and therefore the RAIM limit,
for any location at any time in the future. The Navigator limits the
prediction time to 24 hours.

TSO C-129 contains strict requirements governing the use and

availability of RAIM as it pertains to the approach flight phase:

• RAIM predictions must indicate that approach RAIM will

be available for the duration of the FAF to MAP leg.
• Approach RAIM must be in use at the FAF.
• Approach RAIM cannot be unavailable for more than five
minutes while between the FAF and MAP.

Revision A 3-17
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

3.10.1 RAIM Prediction

In order to fly a non-precision approach, the Navigator must have
sufficient satellite coverage at the destination airport to provide
approach RAIM. The Navigator uses almanac information to provide
RAIM limit predictions for a destination and time (within the next 24
hours). These predictions are for plus and minus fifteen minutes of
the ETA. You may edit the ETA field to determine the RAIM availabil-
ity at other times. You may edit the airport identifier to determine
RAIM availability at any airport in the data base.

If your Active Flight Plan ends with an airport or approach, the RAIM
prediction uses that airport for the prediction. If your Active Flight Plan
does not end in an airport or approach, or you have no Active Flight
Plan, the prediction uses the airport last viewed under the key.
The Navigator uses the ETA as determined by present ground speed
and wind, if available.

Use the Approach RAIM page found under Sensor Status Mode of the
Auxiliary key to determine the RAIM limit availability at a destination
and time.

• Press repeatedly to get to the SENSOR STATUS

mode.

• Rotate the knob clockwise to access the APR RAIM

AVAILABLE page.
To change the ETA:

• Press .

• Use the selector knobs to change the ETA.

• Press .

To change the airport identifier:

• Press .

• Use the knob to place the cursor in the identifier field.

• Use the selector knobs to change the airport identifier.

• Press .

3-18 Revision B
May 12, 1997
 Chapter 3 Approaches

When approach RAIM is available at the selected destination and

time:

APRêRAIMêAVAILABLE:
EUG®ê21:57±êé15êMIN

When approach RAIM is not available at the selected destination and

time:

RAIMêNOTêAVAILABLE
PDXê14:57±

In the event navigation is not available due to satellite

coverage:

NAVêNOTêAVAILABLE
PDXê14:57±

Revision A 3-19
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

3.10.2 RAIM Prediction on the Approach

At two miles from the FAF, the Navigator predicts the RAIM limit
available for the remainder of the approach, to the MAP, at present
ground speed. If Approach RAIM is predicted , the Navigator illumi-
nates the approach light. If not, the Navigator displays the message:

RAIMêPREDICTEDêN/A
EXEêMISSEDêAPR(DIR)

At the FAF, the Navigator ensures that Approach RAIM is in use. If so,
the Navigator continues with the approach. Otherwise, the Navigator
displays the message:

APPROACHêRAIMêLOST
EXEêMISSEDêAPR(DIR)

If RAIM availability is lost for five minutes while on the FAF to MAP leg,
the Navigator displays the message:

APPROACHêRAIMêLOST
EXEêMISSEDêAPR(DIR)

If the Navigator detects a failed satellite, it displays the

message:

RAIMêERROR
POSITIONêFIXêINVALID

RAIMêERROR
EXEêMISSEDêAPR(DIR)

3-20 Revision A
February 28, 1997
 Chapter 3 Approaches

3.11 DGPS Approaches

This information is a description of Differential Global Positioning
System (DGPS) Approaches. The aircraft must be equipped with
specialized equipment before you can perform DGPS precision
approaches.

Differential GPS systems consist of a ground and an airborne

portion. Together they allow you to perform precision approaches.

The ground portion consists of a ground station with multiple GPS

receivers installed near it. The GPS receivers are installed at a
known latitude and longitude position. The GPS receivers receive
data from the GPS satellite constellation and compute a GPS
position. The ground station computes the difference between the
GPS receivers known position and the instantaneous position the
receiver is computing from the GPS constellation. The position
difference is known as the differential correction. By applying the
differential corrections, airborne Global Navigation Sensor Systems
Units (GNSSUs) improve navigation accuracy to within 1.5 meters
vertically and 1 meter horizontally.

Using a VHF data link (VDL), the ground station transmits to the
approaching aircraft the differential corrections and additional
information the onboard GNSSU receivers use to create an ILS-look-
alike glide path. The onboard GNSSU receiver computes the aircraft
deviation from the final approach path. By using the accurate
differential position, the receiver computes the lateral and vertical
error of the aircraft from the final approach path transmitted by the
ground station. The GNSSU receiver then outputs these deviations
to the Horizontal Situation Indicator (HSI) for display to the flight crew.

To fly a DGPS approach, you must tune the equipment to the correct
Channel, Airport, Runway and Final Approach Segment. This is done
using the DGPS Tuning Mode under the key. See section 8.6
for DGPS tuning instructions.

Revision E 3-21
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

This Page Intentionally Left Blank

3-22 Revision E
April 27, 1998
 Chapter 4 The Waypoint Key

Chapter 4
The Waypoint Key
The key features eight modes:

• Airport
• Approach
• SID
• STAR
• VOR
• NDB
• Intersection
• User

Each press of the key selects the next mode. Press and hold
the key for one second to return to the Airport mode. Within each
mode, you will find information unique to the waypoint or procedure
category.

Revision A 4-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.1 Waypoint Information

The Navigator uses the Jeppesen NavData Database Card to provide
direct access to worldwide data on waypoints and procedures. The
waypoint categories are: Airports, VORs, NDBs, and Intersections.
The procedure categories are: Approaches, SIDs and STARs. Both
the North American and International database cards are required for
complete worldwide information. The following describes the database
information available from the Waypoint mode. The small letter after a
waypoint identifier denotes the waypoint category.

Airports (A) or (M)

Identifier, city name, airport name, communications frequen-

cies, field elevation, runway information, lighting, approach
information, services, and latitude/ longitude. The (M)
denotes a military operation.

Approaches

Airport Identifier associated with Approach, Approach Name

(with Runway, when applicable), IAFs and Transitions, DME
Arcs, Approach Waypoints with Type Identifiers (IAF, FAF,
MAP, MAHP, Intermediate Waypoints).

Standard Instrument Departures

Airport Identifier associated with SID, SID Name, Applicable

Runways, SID Transitions, and SID Waypoints.

Standard Terminal Arrival Routes

Airport Identifier associated with STAR, STAR Name, STAR

Transitions, and STAR Waypoints.

VORs (V)

Identifier, city name, VOR name, navigation frequency,

Morse code for identifier, and latitude/longitude.

NDBs (N)

Identifier, city name, NDB name, navigation frequency,

Morse code for identifier, and latitude/longitude.

4-2 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

Intersections (I)

Identifier, region name, and latitude/longitude.

User Waypoint (U)

User identifier and latitude/longitude.

All Categories

Bearing to waypoint.
Distance to waypoint.
Radial from waypoint (Press and hold for From radial).

Revision A 4-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.2 The Waypoint Displays

The Navigator contains information about each waypoint in the data
base. The available information varies depending on the waypoint
category.

To access these displays:

• Press to display the Airport mode.

• Rotate the knob clockwise to view the different

displays.
Some typical displays are are shown below.

Airport
ŽIAH®êê086­1400¡ClsB ŽIAH®êê086­1400¡ClsB
HOUSTONêêêêêêêêêêêTX HOUSTON INTERCONTINE

ŽIAH®êê086­1400¡ClsB ŽIAH®êê086­1400¡ClsB
ATSê124.05APPê120.05 TWRê125.35GNDêê121.7

ŽIAH®êê086­1400¡ClsB ŽIAH®êê086­1400¡ClsB
CTFê-----êUNIê122.95 ELEVATIONêêêê 98Æ

ŽIAH®êê086­1400¡ClsB ŽIAH®êê086­1400¡ClsB
BEACON,êêêêLIGHTING, IFRêAPCH,êSERVICES

ŽIAH®êê086­1400¡ClsB ŽIAH®êê086­1400¡ClsB
14±ê12000x150Æ,êHARD ,êLEFTêTRAFFIC

ŽIAH®êê086­1400¡ClsB
“29­58ˆ¤ì¶ê95­20ƒª¤³

4-4 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

Approach
Turn the knob right to diplay these pages:

IAH®ê<VOR/DME14L>APR IAH®ê<VOR/DME14L>APR
IAF/TRAN:êCONHOï LEG01:êCONHOïêCF14L³

IAH®ê<VOR/DME14L>APR IAH®ê<VOR/DME14L>APR
LEG02:êCF14L³êKINKSð LEG03:êKINKSðêMA14Lñ

IAH®ê<VOR/DME14L>APR
LEG04:êMA14LñêCOSBI°

Turn the knob left to diplay these pages:

IAH®ê<VOR/DME14L>APR IAH®ê<VOR/DME14L>APR
APRêCRSê154­ŽKINKSð DIRêêTOêFAF:êKINKSð

SID
ADS®ê<DALL9êêêêê>SID
RWY:ALLêTRAN:EIC·

Turn the knob right to diplay these pages:

ADS®ê<DALL9êêêêê>SID ADS®ê<DALL9êêêêê>SID
LEG01:êDFW·êêêBOXOR° LEG02:êBOXOR°êRESLR°

ADS®ê<DALL9êêêêê>SID
LEG03êRESLR°êEIC·

Revision A 4-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

STAR
Turn the to the right to view these pages.

ADS®ê<AQN4êêêêêê>STR ADS®ê<AQN4êêêêêê>STR
TRAN:ABI·êêêRWY:15 LEG01:êABI·êêêCOTTN°

ADS®ê<AQN4êêêêêê>STR ADS®ê<AQN4êêêêêê>STR
LEG02:êCOTTN°CURVIN° LEG03:êCURVIN°êAQN·

ADS®ê<AQN4êêêêêê>STR ADS®ê<AQN4êêêêêê>STR
LEG04:êAQN·êêêMARKM° LEG05:êMARKM°êBRYAR°

ADS®ê<AQN4êêêêêê>STR ADS®ê<AQN4êêêêêê>STR
LEG06:êBRYAR°êHULEN° LEG07:êHULEN°êFLATO°

ADS®ê<AQN4êêêêêê>STR
LEG08:êFLATO°êCREEK°

VOR
Turn the to the right to view these pages.

ŽAUS·êê087­1281¡ ŽAUS·êê087­1281¡
AUSTINêêêêêêêêêêêêTX AUSTIN

ŽAUS·êê087­1281¡ ŽAUS·êê087­1281¡
VORêFREQUENCYê117.1 CODE:êÞ-êÞÞ-êÞÞÞ

ŽAUS·êê087­1281¡
“30­17ˆ§¥¶ê97­42ìª³

4-6 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

NDB
ŽAU¶êêê113­ê693¡
AUSTINêêêêêêêêêêêêTX

Turn the knob right to diplay these pages:

ŽAU¶êêê113­ê693¡ ŽAU¶êêê113­ê693¡
AUSTIê NDBêFREQUENCYê353.0

ŽAU¶êêê113­ê693¡ ŽAU¶êêê113­ê693¡
CODE:êÞ-êÞÞ-ê “30­14¦¢¶ê97­37…¦¥³

Intersection
ŽEDDEE°110­ê675¡
REGION:SOUTHêCENTRAL

Turn the knob right to diplay this page:

ŽEDDEE°110­ê675¡
“30­46ˆ¨¤¶ê97­33€§©³

User
ŽTRMBLë270­ê0€¢¡
“37­23…©©¶122­02‚©¢³

Revision A 4-7
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.3 Selecting Airport, VOR, NDB, Intersection

or User Waypoints
There are four methods for selecting Airport, VOR, and NDB way-
points:

• Enter the waypoint identifier.

• Enter the waypoint city name.
• Enter the waypoint name.
• Scan the identifiers in the database.
There are two methods for selecting Intersection and User waypoints:

Identifier

ŽIAH®ê086­1400¡ClsB
HOUSTON TX

City Name

Waypoint
ŽIAH®ê086­1400¡ClsB
Name
HOUSTON INTERCONTINE

• Enter the waypoint identifier.

• Scan the identifiers in the database.
Once you have selected the desired identifier, you may view addi-
tional waypoint information in the bottom line of the display.

• Rotate the knob to view additional waypoint informa-

tion on the bottom line of the screen.

4-8 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

4.3.1 Select a Waypoint by Identifier

Use this method to select a waypoint by Indentifier. This is by far the
most commonly used method.

• Press until the desired category is selected.

• Press .

• Rotate the knob, in either direction, until the desired

letter is displayed.

• Rotate the knob clockwise to select the next character

field.
• Repeat the previous two steps until the desired waypoint
identifier is displayed.

• Press to complete the selection.

4.3.2 Select a Waypoint by City Name

Use this method to select a waypoint by City Name. There are many
duplicate City Names in the data base. To select between duplicate
city names, position the cursor under the last letter of the City Name,
then use the knob to move among the duplicates.

• Press until the desired category is selected.

• Press .

• Use the knob to position the cursor in the City Name

field.

• Rotate the knob, in either direction, until the desired

letter is displayed.

• Rotate the knob clockwise to select the next character

field.
• Repeat the previous two steps until the desired City Name
is displayed.

• Press to complete the selection.

Revision A 4-9
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.3.3 Select a Waypoint by Waypoint Name

Use this method to select a waypoint by Waypoint Name.

• Press until the desired category is selected.

• Turn the knob one click to the right to view the

Waypoint Name field.

• Press .

• Use the knob to position the cursor in the Waypopint

Name field.

• Rotate the knob, in either direction, until the desired

letter is displayed.

• Rotate the knob clockwise to select the next character

field.
• Repeat the previous two steps until the desired City Name
is displayed.

• Press to complete the selection.

4.3.4 Scan Waypoint Identifiers

Use this method to select a waypoint scanning through the entire data
base.

• Press until the desired category is selected.

• Use the knob to select a Waypoint Identifier.

Once you have selected the desired identifier, you may view addi-
tional waypoint information in the bottom line of the display.

• Rotate the knob to view additional waypoint informa-

tion on the bottom line of the screen.

4-10 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

4.4 Selecting Approach, SID, and STAR

Procedures
Approach, SID, and STAR procedures differ from waypoints in that the
procedures are lists of waypoints linked together as a subroute,
selected by airport identifier. Some airports have multiple procedures
with multiple transitions that depend on your direction of flight and
runway in use. Once you have completed the selection and activated
the prodedure, the Navigator retrieves the entire procedure from the
NavData card.

The Approach, SID, and STAR Procedure modes include several

pages for each procedure. These pages are controlled by the
knob and appear in the display’s bottom line.

Once activated, you may edit SID and STAR procedures. You may
not edit Approach procedures.

Approach procedures are defined with up to three parameters:

• Airport identifier
• Approach name
• Transition name

Name

Identifier IAH® <VOR/DME14L>APR

IAF/TRAN: CONHOï

Transition

Revision A 4-11
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

SID and STAR procedures are defined with up to four parameters:

• Airport identifier
• SID or STAR name
• Transition name
• Runway
Procedure type
Name (SID)
Identifier

ADS® <DALL9 >SID

RWY:ALL TRAN:EIC·

Runway
Transition

Procedure type
Name (STAR)
Identifier

ADS® <AQN4 >STR

TRAN:ABI· RWY:15

Transition Runway

Some SIDs do not have an associated transition. In this case, the

transition field is blank.

The Approach, SID and STAR categories default to the procedures

available for the airport that is currently displayed in the Airport
category.

4-12 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

4.4.1 To Fully Define a Procedure

• Press until the desired procedure category is

selected (Approach, SID, STAR).

• Press .

• Rotate the knob counter-clockwise until the flashing

cursor is placed in the Airport field.
• Edit the Airport identifier with the rotary selector knobs.

• Rotate the knob until the flashing cursor is placed in

the procedure name field.
• Edit the name field with the rotary selector knobs. Note
that the Navigator only display available procedure names
as you rotate the selector knob.

• Rotate the knob clockwise until the flashing cursor is

placed in the procedure transition field.
• Edit the transition field with the rotary selector knobs.
Note that Navigator displays only available transitions as
you rotate the selector knob.

• For a SID or STAR, rotate the knob until the flashing

cursor is placed in the runway field.
• Edit the runway field with the rotary selector knobs. Note
that Navigator displays only available runways as you
rotate the selector knob.

• Press to complete the procedure selection.

4.4.2 To Select a Procedure Name

To change just the procedure name for a selected airport and proce-
dure:

• Rotate the knob to select another procedure name. (If

the airport has only one named procedure, the Navigator
ignores the knob rotation.)

Revision A 4-13
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.4.3 To Select a Transition

To change just the transition for a selected airport and procedure:

• Press .

• Rotate the knob to select another IAF/Transition.

• Press to complete the IAF/TRAN selection. (If the

airport has only one transition, the Navigator ignores the
knob rotation.)

4.5 Activating a Waypoint or Procedure from

WPT
Although waypoints and IFR procedures may be linked together in a
Flight Plan, it is often more convenient to activate them autonomously,
especially when a clearance change requires immediate selection of a
waypoint or procedure not included in the stored plan.

4.5.1 Selecting Direct Steering to Waypoint in WPT

Any waypoint, in any Waypoint mode category, may be selected as
the Active Waypoint. After the second press of the direct-to key, the
Navigator automaticlly switches to the NAV mode.

• Select a waypoint (Airport, VOR, NDB, Intersection, User).

• Press once.

• Use the knob to change the course to/from the

waypoint, if desired.

• Press a second time to make the waypoint the

Active Waypoint.

4-14 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

4.5.2 Activating a SID or STAR Procedure

Any SID or STAR Procedure listed in the Jeppesen NavData Data-
base may be activated from the WPT mode using the key. The
Navigator has three options for activating SID and STAR Procedures:

• Fly direct to the first waypoint.

• Join any leg of the procedure.
• Fly direct to any waypoint.

4.5.2.1 Select Direct to the First Waypoint

Use this option to fly the entire procedure.

• Select a SID or a STAR.

• Press once.

• Use the knob to change the course to/from the

waypoint, if desired.

• Press to make the first waypoint the Active Way-

point and activate the procedure.

4.5.2.2 Join a Leg of the Procedure

Use this option to join any leg of the procedure.

• Select a SID or a STAR.

• Use the knob to select the desired leg.

• Press once and note the leg’s course.

• Press a second time to join the leg and activate the

procedure.

Revision A 4-15
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.5.2.3 Direct-to Any Waypoint in the Procedure

Use this option to fly direct to any waypoint of the procedure.

• Select a SID or a STAR.

• Use the knob to select the leg with the desired

waypoint.

• Press once.

• Use the knob to select the desired waypoint; left to

select the first waypoint of the leg, right to select the
second.

• Note the course to the waypoint. Use the knob to

change the course, if desired.

• Press a second time to fly direct to the waypoint

and activate the procedure.

4.6 User Waypoints

You may store up to 250 User Waypoints in the Navigator’s internal
data base. Once stored, you may edit or erase User Waypoints. A
User Waypoint may have any alphanumeric name from one to five
characters long.

4.6.1 Creating a User Waypoint

The Navigator features three methods for defining User Waypoints.

• Present Position
• Latitude and Longitude
• Bearing and Distance from another waypoint

4-16 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

To create a user waypoint from aircraft present position:

• Press to get to the USER mode.

• Rotate the knob right or left to get to ADD WAY-

POINT? (ENT)

• Press .

• Use the selector knobs to name the waypoint

• Press . Display is now SAVE USING THIS POSI-

TION? (ENT)

• Press to store waypoint as present position.

To create a user waypoint defined by a latitude and longitude:

• Press to get to the USER mode.

• Rotate the knob right or left to get to ADD WAY-

POINT? (ENT).

• Press .

• Use the selector knobs to name the waypoint.

• Press . Display is now SAVE USING THIS POSI-

TION? (ENT).

• Rotate the knob right to get to SAVE USING LAT/

LON? (ENT).

• Press .

• Use the selector knobs to enter the latitude and longitude.

• Press to store the waypoint.

Revision A 4-17
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

To create a user waypoint as a range and bearing from another

waypoint:

• Press to get to the USER mode.

• Rotate the knob right or left to get to ADD WAY-

POINT? (ENT).

• Press .

• Use the selector knobs to name the waypoint.

• Press . Display is now SAVE USING THIS POSI-

TION? (ENT).

• Rotate the knob right to get to WPT+RNG&BRG?

(ENT).

• Press .

• Use the key, key and selector knobs to

choose the base waypoint.

• After you have selected the base waypoint, press .

• Use the selector knobs to enter the bearing and distance

FROM the base waypoint.

• Press to store the waypoint.

4-18 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

4.6.2 Editing a User Waypoint

You may edit the name or position of any stored user waypoint.

To edit a user waypoint:

• Press to get to the USER mode.

• Use the knob to view the desired waypoint.

• Rotate the knob right or left to get to EDIT ? (ENT).

• Press .

• Use the selector knobs to edit the waypoint name, latitude

and longitude as desired.

• Press to save the changes.

4.6.3 Erasing a User Waypoint

You may erase any stored user waypoint.

To erase a user waypoint:

• Press to get to the USER mode.

• Use the knob to view the desired waypoint.

• Rotate the knob right or left to get to ERASE ? (ENT).

• Press .

• Press to confirm the erasure. (Press any other key

to abort the erasure and retain the waypoint.)

Revision A 4-19
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.7 Activating an Approach Procedure

Any Approach Procedure listed in the Jeppesen NavData Database
may be activated from the WPT mode using the key. The
Navigator has several options for activating Approach Procedures:

• Fly direct to the first waypoint.

• Join any leg of the procedure except the FAF to MAP leg.
• Fly direct to any waypoint up to the FAF.
• Direct to the FAF.
• Intercept final approach course inbound.

4.7.1 Select Direct-to the First Approach Waypoint

Use this option to fly the entire procedure.

• Select the Approach.

• Press once.

• Use the knob to change the course to/from the

waypoint, if desired.

• Press to make the first waypoint the Active Way-

point and activate the procedure.

4.7.2 Join a Leg of the Approach Procedure

Use this option to join any leg of the procedure up to the FAF to MAP
leg.

• Select an Approach.

• Rotate the knob clockwise to select the desired leg.

• Press once and note the leg’s course.

• Press a second time to join the leg and activate the

procedure.

4-20 Revision A
February 28, 1997
 Chapter 4 The Waypoint Key

4.7.3 Direct to Any Waypoint in the Approach Procedure

Use this option to fly direct to any waypoint of the procedure.

• Select an Approach.

• Use the knob to select the leg with the desired

waypoint.

• Press once.

• Use the knob to select the desired waypoint; left to

select the first waypoint of the leg, right to select the
second.

• Note the course to the waypoint. Use the knob to

change the course, if desired.

• Press a second time to fly direct to the waypoint

and activate the procedure.

4.7.4 Fly Direct to the FAF

Use this option to fly direct to the Final Approach Fix.

• Select the Approach.

• Rotate the knob one click counterclockwise.

• Press once.

• Note the course to the waypoint. Use the knob to

change the course, if desired.

• Press a second time to fly direct to the FAF and

activate the procedure.

Revision A 4-21
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

4.7.5 Intercept the Final Course Inbound

Use this option to intercept the published final approach inbound to
the FAF.

• Select the Approach.

• Rotate the knob two clicks counterclockwise.

• Press once.

• Note the course.

• Press a second time to join the course inbound to

the FAF and activate the procedure.

4-22 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

Chapter 5
The Flight Plan Key
The Flight Plan Key features four modes:

• Active Plan
• Active Plan Legs
• Stored Flight Plans
• Stored Flight Plans Legs.
The first press of the key takes you to Active Plan mode, the second
to Active Plan Legs. The third press takes you to Stored Flight Plans,
the fourth to Stored Flight Plans Legs. Each additional press switches
between Stored Flight Plans and Stored Flight Plans Legs. To return
to Active Plan mode, press and hold the key for one second.

Use the key to select a stored flight plan for activation, view,
edit, or cancel the active flight plan, and to create, edit, review,
reverse or erase stored flight plans.

The Navigator lets you store up to 400 waypoints in up to 40 flight

plans. The maximum number of waypoints in any one plan is 40. A
typical flight plan would follow this format:

• Departure airport
• SID procedure
• En route waypoints (VORs and Intersections)
• STAR
• Approach for destination airport

Revision A 5-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

5.1 Flight Plan Modes

The four FPL modes contain several data pages each.

Active Plan or “NO ACTIVE FLIGHT PLAN”.

(first Displays the departure and destination waypoints
press) and waypoint identifiers of current leg. Use either
selector knob to change legs. Legs are denoted as
NOW, NEXT, or LAST.

LAX®êê-ºPHX®êêACTIVE
NOW:êPDZ·êêŽPSP®

Press to edit. Press twice to fly the

displayed leg.

Active flight plan legs page (if an Active flight plan

(second exists) displays a leg waypoint pair along with
press) bearing, distance and ETE for the leg. Legs are
denoted as NOW, NEXT 1, or LAST 1. Use either
selector knob to change legs.

NEXTê2:PDZ·êêŽPSP®
082­êê51ƒ¡êETE ê0:26

Stored flight plans or “NO STORED FLIGHT

(third PLANS” message. Use the knob to view other
press) stored flight plans. Displays the departure and
destination waypoints and waypoint identifiers of the
first leg of a stored flight plan. Use the knob to
change legs. Legs are denoted as LEG 1, LEG2…

LAX®êê-ºPHX®êê325¡
LEG 1:êLAX® êêŽPDZ·

5-2 Revision B
May 12, 1997
 Chapter 5 The Flight Plan Key

Press the key to edit. To activate the flight

plan, press on the desired leg, choose direct-
to or join, then press a second time.

To add additional flight plans, rotate the knob

past the first or last stored flight plan to get the
“ADD NEW FLIGHT PLAN” display. Build another
flight plan or use the knob to move back to the
stored flight plans.

ADD NEW FLIGHT PLAN

start ++end

Stored flight plan legs page. Use either selector

(fourth knob to change legs. Displays a leg waypoint pair
press) along with bearing, distance, and ETE for the leg.
Legs are denoted as LEG 1, LEG 2…

LEG 2: PDZ· ŽPSP®

082­ 51ƒ¡ ETE 0:26

To activate the flight plan, press on the

desired leg, choose direct to or join, then press
a second time.

Press and Hold the key at any time to return to the active leg of
the active flight plan.

The key flashes when the Navigator is displaying the Active

Legs or Stored Legs pages.

Revision B 5-3
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

5.2 Entering Waypoints and Procedures

When editing or creating a flight plan, you have the choice of entering
waypoints, by identifier, directly with the key and selector knobs,
or selecting waypoints from one of the or Nearest modes by
identifier, name, or city name. Use the direct entry method when you
know the identifier. Use the WPT or Nearest method when you do not
know the identifier.

You can enter SID, STAR, and Approach procedures into any flight
plan from the Active Plan or Stored Flight Plans mode. It is best if you
build the flight plans starting with the departure airport and ending with
the destination airport. The Navigator can then present the SID for
the departure airport and the STAR and Approach for the destination
airport.

The Navigator will accept only one SID, one STAR, and one Approach
in a flight plan.

When entering waypoints and procedures, you first select the way-
point or procedure type then the waypoint identifier. The waypoint
types are:

A Airport waypoint type

_APRCH Approach procedure type
_SID SID procedure type
_STAR STAR procedure type
V VOR waypoint type
N NDB waypoint type
I Intersection waypoint type
U User waypoint type

5-4 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

When entering waypoints, select the waypoint type, select the

identifier, then press to insert the waypoint into the flight plan.

EDIT FLIGHT PLAN

ADS® +·BUJ -DFW·

Waypoint Type

EDIT FLIGHT PLAN

ADS® +_STAR -DFW·

When entering procedures, select the procedure type, select the

complete procedure (airport, name, transition and runway), then press
to insert the procedure into the flight plan.

When you add an Approach procedure to a flight plan, the Navigator

replaces the destination airport with the procedure and closes the
editing session. If you later delete the Approach procedure, the
Navigator reinserts the related airport as the last waypoint of the plan.

As long as you do not edit waypoints of a SID or STAR procedure, the

Navigator will treat the procedure as a single entry. If you delete or
replace the unedited procedure, the Navigator deletes or replaces the
entire procedure. If you edit the procedure, the Navigator converts it
into a series of separate waypoints. To remove the edited procedure,
you must delete each waypoint of the procedure.

Revision A 5-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

5.3 Building a Flight Plan

Flight plans are created from the Stored Flight Plans mode. You may
enter the waypoint identifier directly or select a waypoint from WPT or
Nearest. You may enter SID, STAR, and Approach procedures now,
or use Active Flight Plan edit to add them later.

To build a new flight plan:

• Press to get to “STORED FLIGHT PLANS”.

• Rotate either knob left or right until “ADD NEW FLIGHT

PLAN” is displayed.
• Note the flashing ++ symbols between “start” and “end”.
These symbols indicate the waypoint insertion point.
When a flight plan has more than two waypoints, use the
knob move the insertion point.

• Press the flashing to add the first waypoint.

• Add waypoints and procedures as described in the

following paragraphs.

• To exit Flight Plan Create, press when ++ is

displayed.

5.3.1 Adding a Waypoint by Identifier

If you know the waypoint identifier:

• You must have the flashing ++ symbols displayed.

• Press to get a flashing category letter.

• Use the knob to select a waypoint category.

• Use the selector knobs to enter the identifier.

• Press to add the waypoint.

5-6 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

5.3.2 Adding a Waypoint Using WPT

If you do not know the waypoint identifier, use to select the

waypoint by name or city name.

• You must have the flashing ++ symbols displayed.

• Press .

• You can change the category by pressing the key

until the desired category is selected.

• Use the key and selector knobs to select the

waypoint by name or city name.

• Press the flashing key to enter the selection into the

flight plan.

5.3.3 Adding a Waypoint Using NRST

To add a waypoint to a flight plan from the list of nearest waypoints:

• You must have the flashing ++ symbols displayed.

• Press .

• You can change the category by pressing until the

desired category is selected.

• Use the knob to choose a waypoint from the list of 20.

• Press to enter the selection into the flight plan.

Revision A 5-7
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

5.3.4 Adding a Procedure

To add a procedure to the flight plan:

• You must have the flashing ++ symbols displayed.

• Press to get a flashing category letter.

• Use the knob to select a procedure category.

• Press .

You can change the procedure category by pressing

until the desired category is selected.

• Use the key and selector knobs to select the

procedure.

• Press to enter the procedure into the flight plan.

5-8 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

5.4 Editing a Flight Plan

In the edit mode, you can add, replace, or delete waypoints and
procedures from the selected flight plan. You can edit the active flight
plan or a stored flight plan at any time. The steps are the same,
except for some special considerations given to the waypoints of the
Active Leg.

You cannot edit a Flight Plan from the legs page, denoted by a
flashing key.

Approach procedures can only be replaced or deleted. You cannot

edit Approach procedures.

SID and STAR procedures can be replaced, deleted, or edited.

When you edit a SID or STAR procedure in a flight plan, the Navigator
breaks that procedure into individual waypoints. You can no longer
replace or delete an edited procedure. But since the procedure is
now broken into separate waypoints, you can replace or delete any of
the individual waypoints.

If you attempt to edit the waypoints of the Active Leg, the Navigator
displays the message:

(FPL)êTOêCANCELêAND
MODIFYêACTIVEêLEG

If you confirm the edit request by pressing , the Navigator

cancels the current flight plan, leaving the current leg guidance
(guidance between From and To waypoints) intact. Complete the
edit then reactivate the flight plan with the key.

To edit a stored flight plan, you begin by pressing .

Revision B 5-9
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

5.4.1 Insert, Replace or Delete Waypoints

This paragraph describes how to edit waypoints in the flight plan.
For information on editing SID, STAR, and Approach procedures, see
the following paragraphs.

To add, delete, or replace a waypoint in a flight plan:

• Use the key and selector knobs to get to the

desired flight plan.

• Press to get the flashing ++ symbols.

• Use the knob to select the edit point in the flight plan.

To insert a waypoint:

• Press .

• Use the knob to select a waypoint category.

• Use the selector knobs to select a waypoint.

• Press to add the waypoint to the flight plan.

To replace or delete the waypoint to the right of the ++:

• Use the knob to select REPLACE, or DELETE.

• Press .

• Repeat the insert and replace/delete steps as neces-

sary.

• Press to quit the editing session.

5.4.2 Insert a Procedure

Usually, you will want to insert procedures that are associated with
your planned departure and destination airports. If, however, you
choose procedures that are not associated with these airports, the
Navigator uses several rules to ensure that the selected SID, STAR,
and Approach procedures are placed into the flight plan correctly.

5-10 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

When you insert a SID, the Navigator places it at the

beginning of the flight plan, replacing the departure
airport.
When you insert a STAR, the navigator places it just
before the destination airport.
When you insert a STAR for an airport that is not the
destination airport in the flight plan, the Navigator will
replace the original destination airport with the airport
associated with the STAR you selected.
When you insert an Approach, the navigator places it at
the end of the flight plan, replacing the destination airport.
To add a procedure to a flight plan:

• Use the key and selector knobs to choose the

desired flight plan.

• Press to get the flashing ++ symbols.

• Use the knob to select the edit point in the flight plan.

• Press .

• Use the knob to select a procedure category.

• Press to get to the procedure selection page.

If the departure or destination airport does not have a

procedure of the type you selected, the Navigator
displays a message stating the fact. Press to
return to editing or to choose a procedure from
another airport (note the rules mentioned above).
• Select the procedure.

• Press to insert the procedure into the flight plan.

• Repeat the insert and replace/delete steps as neces-

sary.

• Press to quit the editing session.

Revision B 5-11
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

5.4.3 Replace or Delete a Procedure

To replace or delete a procedure in a stored or active flight plan:

• Use the key and selector knobs to choose the

desired flight plan.

• Press to get the flashing ++ symbols.

• Use the knob to move to any portion of the procedure.

When in the procedure, the display flashes:

“REPLCE” “STAR” or “SID” or “APRCH”
To Replace the procedure:

• Press .

• Select a new procedure.

• Press to insert the procedure in place of the old.

To Delete the procedure:

• Use the knob to select “DELETE”.

• Press to delete the procedure.

• Press to quit the editing session.

5.4.4 Editing a SID or STAR Procedure

To edit a SID or STAR procedure in a stored or active flight plan:

• Use the key and selector knobs to choose the

desired flight plan.

• Press to get the flashing ++ symbols.

• Use the knob to move to any portion of the procedure.

When in the procedure, the display flashes:

“REPLCE” “STAR” or “SID”

5-12 Revision B
May 12, 1997
 Chapter 5 The Flight Plan Key

• Rotate the knob until the display flashes “EDIT”,

“STAR”, or “SID”.

• Press to display the ++ symbol.

The procedure is now broken into individual waypoints.

• Edit the waypoints as desired. Reference the Insert,
Replace, or Delete Waypoints section of this manual.

5.5 Review Legs of a Flight Plan

The Legs page of the Active and Stored Flight Plans mode provide
bearing, distance, and ETE for each leg of the flight plan. ETE is
based on current ground speed.

For stored flight plans, legs are named LEG 1, LEG 2, …

For the active plan, legs are named LAST 2, LAST 1, NOW, NEXT 1,
NEXT 2…

To view the bearing and distance of any leg in any stored or active
Flight Plan:

For Active Plan legs:

• Press twice ( FPL key is flashing).

• Use either knob to move between legs.

For Stored Plan legs:

• Press twice, unless there is an active FPL, then

press it three times to get to STORED FLIGHT PLANS.

• Use the knob to select a stored flight plan.

• Press (FPL key is flashing).

• Use either knob to move between legs.

Revision B 5-13
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

5.6 Reversing a Flight Plan

You may reverse any stored flight plan. If the flight plan contains SID,
STAR, or APPROACH procedures, these procedures are automati-
cally replaced with the associated airport as part of the reversal
process.

To reverse the order of any stored flight plan:

• Select a stored flight plan.

• Rotate the knob left until the flashing word REVERSE

is displayed.

• Press .

5.7 Activating a Flight Plan

You may activate a flight plan on any of its legs or direct-to any of its
waypoints. After you have built or recalled the desired flight plan, use
the knob to view the legs. Use the key to activate the plan.

Activating a new flight plan automatically cancels an existing active

flight plan. You do not have to cancel the old one manually to activate
a new one.

You have two choices when activating a flight plan:

Join the displayed leg.

Fly direct to either waypoint in the leg.

5.7.1 Join a Flight Plan Leg

To join a leg of a stored flight plan:

• Select a stored flight plan.

• Rotate the knob clockwise to select the desired leg.

• Press once and note the leg’s course.

• Press a second time to join the leg and activate the

procedure.

5-14 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

5.7.2 Direct-to a Flight Plan Leg

To fly direct-to any waypoint of a stored flight plan:

• Select a stored flight plan.

• Use the knob to select the leg with the desired

waypoint.

• Press once.

• Use the knob to select the desired waypoint; left to

select the first waypoint of the leg, right to select the
second.

• Note the course to the waypoint. Use the knob to

change the course, if desired.

• Press a second time to fly direct to the waypoint

and activate the procedure.

5.8 Canceling an Active Flight Plan

There are three ways to cancel the Active Flight Plan:

• Use the Cancel selection from Active Plan mode.

• Activate a different flight plan.

• Use to select a destination from WPT or

APT/VOR mode.
Selecting CANCEL from Active Plan mode leaves the current From
and To waypoint while canceling the remainder of the flight plan.
Now, the first press of the key displays NO ACTIVE FLIGHT
PLAN.

Activating a flight plan automatically cancels an existing active flight

plan. You do not have to manually cancel the old one to activate a
new one.

Selecting direct-to any waypoint or procedure from WPT or APT/VOR

mode automatically cancels the existing active flight plan.

Revision A 5-15
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

To cancel an Active Flight Plan:

• Press to view the Active Plan.

• Rotate either knob left or right until CANCEL is displayed.

• Press to cancel the flight plan.

5.9 Erasing a Flight Plan

You may erase any stored flight plan. Erasing is a two-key process
( and ), where the second key press gives you the
opportunity to change your mind.

To erase a stored flight plan:

• Select a stored flight plan.

• Rotate the knob left until the flashing word ERASE is

displayed.

• Press .

• Note the prompt ERASE FLIGHT PLAN ( FPL ).

• Press to confirm and erase.

or

• Press to abort the erase process.

5-16 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

5.10 Nearest Waypoints and Agencies

The Nearest ( ) Key provides immediate access of up to 20 of
the nearest Airports, Approaches, VORs, Agencies, NDBs, Intersec-
tions, and User-created waypoints within a 200 nm radius.
Waypoints and Approaches are displayed in order of their distance
from the aircraft’s current position. Nearest SID and STAR proce-
dures are not provided.

The Waypoint and Approach data available in the APT/VOR modes is

the same information that is accessed from the WPT modes.
Procedures for access to this data, and selection of Waypoints or
Approaches, is identical to WPT.

To locate the waypoint or approach that is closest to the aircraft’s

current position:

• Press until the desired waypoint category is

displayed.

• Rotate the knob clockwise to view the 20 nearest

waypoints.
Each rotation of the knob brings up the next waypoint, in
order of proximity to the aircraft’s current position.
• To access additional information on the displayed
waypoint, rotate the knob.

For the Approach category:

• Press .

• Rotate the knob counterclockwise to place the cursor

in the Airport field.

• Rotate the knob until the desired Airport is displayed

(only available Approaches are displayed).

Use to activate the displayed Waypoint or Approach.

Revision A 5-17
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

5.11 Holding Patterns

You may fly a holding pattern at any waypoint in the data base. If the
holding fix is in the Active Flight Plan, you must instruct the Navigator
to Suspend (hold) automatic waypoint sequencing. If you have no
Active Flight Plan but are navigating direct-to a waypoint, there is no
need to Suspend waypoint sequencing.

5.11.1 Holding at a FPL Waypoint

In order to hold at a waypoint, it must be your TO waypoint. If it is not,
use the key and the key to make the holding fix the TO
waypoint.

To hold at a fix that is in your Active Flight Plan:

• Make sure the desired holding fix is your TO waypoint.

• Press .

• Rotate the knob right to “SUSPEND”.

• Use the knob to enter the inbound holding course, TO

the holding fix. Set your OBS for visual reference. You
may use the key to quickly get the reciprocal of the
displayed course.

• Press . Note that the HOLD light is illuminated.

5.11.2 Holding Outside of a Flight Plan

To hold at a waypoint that is not part of an Active Flight Plan:

• Press .

• Use the knob to enter the inbound holding course, TO

the holding fix. Set your OBS for visual reference. You
may use the key to quickly get the reciprocal of the
displayed course.

• Press . The HOLD light does not illuminate.

5-18 Revision A
February 28, 1997
 Chapter 5 The Flight Plan Key

5.11.3 Holding After a Missed Approach

See Section 3.9, How to Fly a GPS Approach, for instructions on
holding at the missed approach holding waypoint.

5.12 Oceanic/Remote Operations

Before conducting oceanic operations, a prediction of the availability
of the FDE function for the intended flight must be conducted. The
FDE Prediction is described in the Trimble FDE Predictor User’s
Manual, Trimble Publication Number 81686.

Revision C 5-19
August 25, 1997
TRIMBLE 2101 I/O Approach Plus

This Page Intentionally Left Blank

5-20 Revision A
February 28, 1997
 Chapter 6 The NAV Key

Chapter 6

The NAV Key

The key features two modes:

• NAV
• Waypoint Information
The first press of the key takes you to NAV, the second to Waypoint
Information. Additional presses toggle between the two modes.
Each mode contains multiple pages.

Revision A 6-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

6.1 NAV Mode

The Primary NAV Page of NAV mode is the most frequently used
page in the Navigator. Once you have activated a waypoint or flight
plan for navigation, using the key, the Primary NAV Page
provides the information needed to navigate the aircraft along the
selected route of flight. The top line displays bearing, distance, and
ETE to the current destination. The bottom line displays the built-in
CDI, aircraft ground track, and ground speed.

Each line has eight pages available. Some of the data, such as
heading and True Air Speed (TAS), is available if you have external
air data and heading sources connected. If the option is not avail-
able, the data fields contain dashes. Starting with the Primary NAV
page and rotating the knobs clockwise, the pages contain:

Top Line
• TO-waypoint name, Bearing, Distance and ETE.
• TO-waypoint ETE and ETA.
• Heading, TAS, and wind if equipped with optional airdata
computer, or “—”.
• Heading or “——”, Track and Drift Angle or “——”
• Current Track and recommended altitude (odd or even)
or Vertical Navigation Profile Information
• Desired Track, Fly left or right to correct cross track error,
XTK error.
• MSA and MESA.
• TKE graphic, DTK and Distance to the to-waypoint.
Bottom Line
• CDI, Track and Ground Speed.
• Current Track and recommended altitude (odd or even)
or Vertical Navigation Profile Information
• Heading, TAS, and wind if equipped with optional airdata
computer, or “—”.
• Heading or “——”, Track and Drift Angle or “——”.
• MSA and MESA.
• TO-waypoint ETE and ETA.
• Desired Track, Fly left or right to correct cross track error,
XTK error.
• Advisory Waypoint range and bearing.

6-2 Revision E
April 27, 1998
 Chapter 6 The NAV Key

6.1.1 NAV Displays

These illustrations depict the NAV Mode displays for the top and
bottom lines respectively, corresponding to the order in which they
appear (clockwise).

Top Line Displays

ŽLAX®ê124­ê227¡ê0:54

ETEêê0:54êETAêê3:53z ›125­255‹ê134­/005‹

¿ÆÆÆÆÃÆÆÆƾš124­227¡ ›125­êêŸ124­êê™001­±

MSAêê5ƒêêMESAê10… Ÿê124­êMAINTAINêEVEN

or
š122­êFLY^000­ê^0€£¡ ATê12…êFORê5ƒê¸ê600ê

Bottom Line Displays

þÒÞÒÞÛÞÒÞÒÿŸ124­250‹ Ÿê124­êMAINTAINêEVEN

or

ŽLAX®ê124­ê227¡ê0:54 ATê12…êFORê5ƒê¸ê600

š122­êFLY^000­ê^0€£¡ ›125­255‹ê134­/005‹

ETEêê0:54êETAêê3:53z ›125­êêŸ124­êê™001­±

MSAêê5ˆêêMESAê10…

Revision E 6-3
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

You may create various display combinations from these pages.

The selector knob controls the top display line. The selector
knob controls bottom display line. If you leave NAV mode, the last
pages viewed are displayed when you return. Press and hold
for 1 second to restore the pages to power-on settings.

To change the NAV mode display:

• Press .

• Use the knob to select the desired top line display.

• Use the knob to select the desired bottom line

display.

6.1.2 Advisory Waypoint

The Navigator features an Advisory Waypoint page available on the
bottom line of the Primary NAV mode display. This page displays
range, bearing and ETE to the last waypoint viewed in either WPT or
NRST. Use this feature to monitor your position relative to any
waypoint in the database without altering your flight path. Note that
any time you use the or key, the last waypoint you viewed
is the Advisory Waypoint.

To use the Advisory Waypoint feature:

• Select the waypoint from or .

• Press .

• Rotate the knob one click left.

6-4 Revision E
April 27, 1998
 Chapter 6 The NAV Key

6.1.3 The Time Display

The Navigator determines Estimated Time Enroute (ETE) and
Estimated Time of Arrival (ETA) for the TO waypoint and for each
waypoint in the active flight plan along the flight path. Times to the
TO waypoint are available from the primary NAV page.

ETE to the TO waypoint:

êŽSFO®ê009­ê220¡êê1:15

ETE and ETA to the TO waypoint:

êETEê1:15LêETAê14:24L

Flight Plan Leg times are available under the second NAV page.

êŽSFO®ê14:24Lê1:15

Flight plan leg ETE is also available under the second FPL page
when a flight plan is active. See the FPL section for details.

Total time and distance through the active flight plan is available
under the second NAV page by going to the last waypoint in the flight
plan.

If your installation provides True Air Speed (TAS) and Heading inputs
to the Navigator so that wind is available, the Navigator computes
these times based on current TAS and computed wind. In this type of
installation, the symbols “--:--” may be displayed for some leg ETEs if
you are flying at low airspeeds in high winds, such that the wind
velocity is greater than TAS. In this circumstance, the wind is prevent-
ing any forward progress along the desired track.

NOTE
Wind and time information under the CALC page are computed using
current ground speed or pilot-entered ground speed; they are not
corrected for wind.

Revision A 6-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

6.1.4 The Vertical Navigation Display

Vertical Navigation (VNAV) Profiles display descent or climb informa-
tion to the active waypoint as entered under the key. Instruc-
tions for entering VNAV information are described in Section 7.5.

If the aircraft is not yet at the descent or climb starting point, or if you
have not entered VNAV information, the following is displayed under
the key:

Ÿê124­êMAINTAINêODD

The current track is 124°. Maintain ODD altitude based on VFR/IFR

altitude rules.

If you have entered VNAV information, the following will be displayed

under the key when you reach the climb or descent starting
point:

ATê12…êFORê5ƒê¸ê600ê

This indicates your altitude is 12,500 feet, the target altitude is 5,300
feet and you should descend at 600 feet per minute to reach the
desired altitude.

During the climb or descent, the navigator will provide several

messages. These include when to begin the climb or descent, the
time to the target altitude and when to level off. When the MSG
annunciator light flashes, press to view these messages.

6-6 Revision E
April 27, 1998
 Chapter 6 The NAV Key

6.2 Ground Track Displays

The Ground Track pages in NAV mode provide information on the
desired track (DT), the ground track (TK), track error (TKE), and the
distance off-track, in both graphic and numeric formats.

6.2.1 Track Error Graphic Display

The Track Error (TKE) Display is available in graphic form on both the
top and bottom lines of the primary NAV display (press the NAV
button for approximately one second until display defaults to primary
NAV mode.) The top line TKE graphic provides information on TKE
only and is available at any time. The bottom line TKE graphic
provides information on both CDI and TKE simultaneously (unless
your installer has disabled this feature during setup).

Scaling is 10° per mark except when the approach annunciator is on,
in which case scaling is 5° per mark.

For a CDI-only graphic on the lower line of the display, the CDI
symbol (the vertical line representing the Course Deviation) is seven
pixels high, and extends the entire height of the LED cell. For the
combined TKE/CDI graphic, the CDI symbol is a vertical line five
pixels high (top five), while the TKE symbol is a vertical line two pixels
high (bottom two).

Revision E 6-7
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

To access the top line TKE graphic from the primary NAV display:

• Rotate the counterclockwise one click.

¿ÆÆÆÆÄÆÆÆƾ295­êê21¡
{ÞÞÞÞÛÞÞÞÞ}Ÿ294­158‹

The scale on the top line provides TKE graphic information of aircraft
nose position relative to desired track. The moving symbol is not a
fly-to symbol, but rather an indication of current nose position.
Bearing to the Active Waypoint and distance-to-go are also displayed
on the top line. The CDI located on the bottom line is a fly-to symbol
and provides course deviation left and/or right of desired track.

The following display illustrates the combined CDI/TKE graphic

found on the primary NAV page.

ŽSFO®ê295­ê21€¡êê7:59

{ÞÞÈÞØÞÞÞÞ}Ÿ294­158‹

When the CDI symbol and TKE symbols are coincident, standard
course intercept is being flown as described below.

To smoothly intercept the desired track represented by the location of

the CDI indicator, turn the aircraft toward the CDI fly-to symbol until
the TKE symbol is located directly under the CDI symbol. Maintaining
this relationship throughout the intercept will result in a shallowing of
the intercept angle. To increase the rate of intercept, merely oversteer
the TKE symbol relative to the CDI indicator.

6-8 Revision E
April 27, 1998
 Chapter 6 The NAV Key

6.2.2 CDI Display

6.2.2.1 Cross-Track Errors – Ground Track

The internal CDI simulates a mechanical course deviation indicator.
When the flashing vertical bar is centered on the Ø, the aircraft is on
course. If the flashing bar is to the left or right of the Ø, a cross-track
error is occurring. To correct the error, fly towards the “needle” as in
conventional VOR navigation.

{ÒÞÒãØÞÒÞÒ}Ÿ124­250‹

If the cross-track error is greater than the full scale setting of the CDI,
the left or right bracket will change to a flashing arrow, indicating the
direction to steer to center the CDI. Additionally, the cross-track error
distance will be displayed numerically in nautical miles (nm), statute
miles (sm), or kilometers (km) (the units used depend on how the
installer configured the unit). If cross-track error is greater than 9.9, it
will be displayed as a whole number up to 99. The following figure
illustrates a cross-track error of 2.6 nm, with an internal CDI sensitiv-
ity setting of 1.0 nm full scale.

¹ÞÞÞ2†¡ÞÞÞ}Ÿ149­250‹

Revision E 6-9
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

6.2.2.2 CDI Scale

Each mark on the Navigator CDI (Ø, vertical bar, or dot) corresponds
to one dot on the external CDI. Scaling is automatically controlled by
the Navigator at 5.0 nm enroute, 1.0 nm terminal, and 0.3 nm during
the approach.

The example below shows the en route mode display when the
scaling is 5 nm. Each bar represents 1.0 nm.

þÒÒÒÒØÒÒÒÒÿ

Below is the terminal mode display when the scaling is 1 nm. Each
dot represents 0.2 nm.

þÞÞÞÞØÞÞÞÞÿ

The display below illustrates approach mode with scaling of 0.3 nm

and the APR annunciator ON. Each dot represents 0.06 nm.

þÞÞÞÞØÞÞÞÞÿ

If the internal CDI was configured at installation for 2.5 nm full scale,
the enroute display looks like the one below. Each bar represents 1
nm.

þÒÞÒÞØÞÒÞÒÿ

6-10 Revision E
April 27, 1998
 Chapter 6 The NAV Key

6.3 Waypoint Information Mode

Pressing the NAV key twice accesses the waypoint information pages.
These pages display information about the Active Flight Plan
waypoints. Use the knob to move through the waypoints on the
top line. Use the knob to view the available information about the
waypoint.

Some information is computed “through the flight plan”. For example,

distance through the flight plan is computed by adding the distance of
each leg of the flight plan from present position to the selected
waypoint, as opposed to the distance direct from present position to
the selected waypoint.

The Navigator displays times (ETE and ETA) that are corrected for
wind speed and direction when wind is available. See 6.1.3.

You can fly direct-to any waypoint displayed in this mode with the
key.
To access the NAV Waypoint Information mode displays:

• Press to get to WAYPOINT INFORMATION.

• Use the knob to select the desired active plan

waypoint.

• Use the knob to select the desired information display.

Turning the knob left one click displays:

• Bearing and direct distance to the WPT on the top line

and distance and ETE to the waypoint through the flight
plan on the bottom line. Distance is displayed as dashes
(- - -) for waypoints you have passed.

Turn left one more click to access:

• ETA and ETE to the waypoint through the flight plan.

• Fuel remaining at the waypoint.
• Fuel needed to reach the waypoint, through the flight plan.

Turn the to the right to display information about the waypoint.

See “The Waypoint Displays” for details about these pages.

Revision E 6-11
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

This page intentionally left blank.

6-12 Revision E
April 27, 1998
 Chapter 7 The Calculator Key

Chapter 7
The Calculator Key
The key allows you to perform many common E6B computer
functions and other calculations.

The key features three modes:

• Flight Plan/Fuel
• Air Data
• Save Present Position
This chapter covers the following topics available with the calculator
key:

• Time, Distance, and Speed

• Fuel Management
• Winds Aloft
• Pressure Altitude
• Density Altitude
• True Airspeed
• Crosswind and Headwind
• Save Present Position

Revision A 7-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

7.1 Entering Data in the CALC Mode

In general, to enter information and perform calculations in the CALC
mode:
• Press to access the desired CALC mode.

• Rotate the knob to move to the desired page.

• Press .

• Rotate the knob to move to the desired field.

• Rotate the knob to change information in a field.

• Continue this procedure until all information is entered.
• Press to complete the entry.

When one field is updated, all pages containing that field reflect the
current information.

All the CALC mode displays (except Pressure Altitude page) use data
provided by the Navigator or external sensors. When manually
editing data, returning to NAV mode erases the changes.

7.2 Flight Plan/Fuel Pages

Flight Plan calculations are available in the Fuel Management and
Time, Distance, and Speed pages. These pages show current flight
plan data and information when available. They may also be used as
a flight planning calculator.

If you are flying an Active Flight Plan, these pages use the current
ground speed and external fuel computer or user-entered rate of fuel
consumption to compute the following:

• Estimated Time Enroute (ETE)

• Estimated Time of Arrival (ETA)
• Flight Plan Distance (DIST)
• Rate of Fuel Consumption
The Fuel Management and Time, Distance, and Speed pages also
estimate the amount of fuel required to arrive at the current destina-
tion. If you are flying a multi-leg flight plan, the data reflects calcula-
tions from present position through the flight plan to the final destina-
tion.

7-2 Revision A
February 28, 1997
 Chapter 7 The Calculator Key

7.2.1 Time, Distance and Speed Calculations

To display the Time, Distance and Speed page:

• Press to access the FLT PLAN/FUEL mode.

• Rotate the knob to display the Time, Distance and

Speed page.
The Time, Distance, and Speed page shown below indicates the flight
plan ground speed is 160 knots; flight plan distance is 191 nautical
miles; the flight plan time (ETE) is 1 hour and 11 minutes; the esti-
mated time of arrival (ETA) is 9:25 local time.

FPLêGSê160‹êETEê1:11
DISTêêê191¡êêêê9:25L

All the fields displayed (except ETA) may be edited at any time for
different flight plan calculations.

Distance, ground speed, and ETE may be manually edited to view

different flight plan data. The following chart shows how each
changed field initiates new calculations:

Changed Field Calculation Affected

ETE Distance, ETA
Distance ETE, ETA
Ground Speed ETE, ETA

To edit a field in the Time, Distance and Speed page:

• Press .

• Rotate the knob to move through the editable fields.

• Rotate the knob to change the data in the selected

field.

• Press to accept the changes.

NOTE
Wind and time information under the CALC page are computed using
current ground speed or pilot-entered ground speed; they are not
corrected for wind.

Revision A 7-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

7.2.2 Fuel Management Calculations

To display the Fuel Management page:
• Press to access the FLT PLAN/FUEL mode.

• Rotate the knob to display the Fuel Management

page.
The Fuel Management page below indicates that the estimated fuel
required to reach the destination is 14.5 gallons; fuel consumption
rate is 12.3 gallons per hour; and fuel efficiency is 13.0 nautical
miles per gallon. The fuel consumption rate is taken from the Air and
Fuel Data Computer input, if available, or from user input.

FUELêŽêDESTêêê14…GAL
FLOWêê12ƒGHêêê13€¡PG

The fuel required and current fuel consumption rate fields may be
edited. These changes affect the distance field of the previous page.
The fuel required field displays the fuel needed to reach your
destination at current GS and consumption rate. The fuel efficiency
is always computed by using the ground speed from the Time,
Distance, and Speed page. This is the aircraft’s current ground
speed unless a new value has been entered.

For flight planning, you can determine the maximum remaining flight
range and fuel efficiency. Enter the remaining usable fuel and current
fuel consumption rate as follows:
• Press .

• Rotate the knob to move through the editable fields.

• Rotate the knob to change the data in the selected

field.

• Press to accept the changes.

The DIST field on the previous page changes, showing the maxi-
mum remaining flight range.

7-4 Revision B
May 12, 1997
 Chapter 7 The Calculator Key

Editing the fuel or rate of consumption fields results in changed

values as shown below:

Changed Field Calculation Effected

Fuel Distance (previous page)
Rate Distance, MPG
Distance Fuel

Distance can be edited on the Time, Distance, and Speed page.

Changing or computing a value on one page automatically changes
the other page, but does not affect current flight data.

Fuel management calculations are based on the information the user

enters and the aircraft’s current ground speed. The user is respon-
sible for monitoring fuel reserves, changes in fuel consumption rates
and changing wind conditions.

7.2.3 Fuel Remaining Page

The initial fuel on board is entered during the power-up sequence.
The Navigator keeps track of Fuel Remaining, based on fuel rate
information from the Air and Fuel Data Computer, if one is used, or
from user input.

To display the Fuel Remaining page:

• Press to access the FLT PLAN/FUEL mode.

• Rotate the knob to display the Fuel Remaining page.

FUELêREMAININGê175„
êRANGEê14:15êê2137¡

The Fuel Remaining page provides the following information:

• Fuel Remaining (initial fuel minus fuel used)

• Flight Time Remaining (fuel remaining divided by fuel
consumption rate)
• Range (flight time remaining times ground speed)

Revision B 7-5
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

To edit the Fuel Remaining field:

• Press to access the FLT PLAN/FUEL mode.

• Rotate the until you reach the Fuel Remaining Page.

• Press .

• Use the to change the value in the fuel remaining

field.

• Press to accept the changes.

7.2.4 Fuel At Arrival Page

To display the Fuel at Arrival page:
• Press to access the FLT PLAN/FUEL mode.

• Rotate the knob to display the Fuel at Arrival page.

The Fuel At Arrival page provides the following information:

• Fuel At Arrival (fuel remaining minus fuel used)

• Flight Time Reserve (Fuel at Arrival divided by Fuel
Consumption Rate)
• Reserve (flight time reserve times ground speed)

FUELê@êARRIVALêê53ƒ
RESERVEêê4:28êê671¡

The Navigator calculates the amount of fuel that will be available on

board when the aircraft reaches its final destination. This display
provides the pilot with the necessary information to evaluate the
reserve fuel situation early enough to take necessary action.

7-6 Revision A
February 28, 1997
 Chapter 7 The Calculator Key

7.2.5 Minimum Fuel Page

The MinimumFuel Page features two editable fields used by the
Navigator to warn you of impending fuel quantity shortages.

To display the Minimum Fuel Page:

• Press to access the FLT PLAN/FUEL mode.

• Rotate the knob to display the Minimum Fuel page.

MIN.êFUELêINêMINUTES
ONêBOARDê30/@DESTê45

The ON BOARD value is used by the Navigator to display the Fuel

Exhausted message when the flight time remaining (at the current
ground speed and burn rate leaves you less than 30 minutes of fuel
at your destination.

The @DEST value is used by the Navigator to display the Using Fuel
Reserve message when the flight time remaining (at the current
ground speed and burn rate) leaves you less than 45 minutes of fuel
reserve at your destination.

To change the time of the Fuel Reserve message or the Fuel Ex-
hausted message:

• Press .

• Rotate the knob to move through the editable fields.

• Rotate the knob to change the setting.

• Press to save the changes.

Revision A 7-7
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

7.2.6 Total Fuel Used Page

To display the Total Fuel Used page:

• Press to access the FLT PLAN/FUEL mode.

• Rotate the knob to display the Total Fuel Used page.

The Total Fuel Used page provides the following information:

• Total Fuel Used

• Total Used by Left Engine
• Total Used by Right Engine

TOTALêUSEDêêêêêê41‚
LEFTêê19ˆêRIGHTê21„

The Navigator keeps track of the fuel used since the last fuel entry.
When installed in a single engine aircraft, or without an Air and Fuel
Data Computer, the second line (Left and Right Engine usage) is not
displayed.

When the Navigator is turned off, the Fuel Used is reset to zero. The
Fuel Remaining is not reset. This feature is useful for multi-stop
flights where the fuel used for each leg may be monitored while
keeping track of the total fuel remaining.

7.2.7 Engine Fuel Flow Page

To display the Engine Fuel Flow page:
• Press to access the FLT PLAN/FUEL mode.

• Rotate the knob to display the Engine Fuel Flow

page.

FUELêŽêDESTêê20êGAL
FLOWêê14GHêê10†¡PG

The Navigator provides a digital readout of the engine fuel flow

quantity to a tenth of a unit per hour. (The units displayed (gallons,
liters, or pounds) depend on the setup of the Navigator.) Total fuel
flow information is available on the main Fuel Management page;
see Total Fuel Page.

7-8 Revision E
April 27, 1998
 Chapter 7 The Calculator Key

7.3 Air Data Pages

Air data calculations are available in the Air Data pages. Use these to
compute:

• Altitude
• TAS
• Wind

7.3.1 Pressure Altitude Calculations

To access the Pressure Altitude mode:
• Press to access the Air Data mode.

• Rotate the knob to display the Pressure Altitude

Calculation page.
The Pressure Altitude page provides the following information:
• Pressure Altitude
• Barometric Pressure Setting
• Indicated Altitude
Pressure Altitude and Indicated Altitude are measured in thousands of
feet or thousands of meters, depending on the setting of the unit in
use.

Barometric Pressure Setting is measured in inches of mercury, from

28.00 in. to 31.00 in. or in millibars, from 948 mb to 1050 mb, depend-
ing on the setting of the unit in use.

In the example below, the Pressure Altitude page indicates that the
barometric pressure setting is 30.32 inches of mercury, the pressure
altitude is 11,200 feet, and barometric altitude is 11,600 feet.

BRê30ƒ¤êPRSêALTê11‚
êêêêêêêBAROêALTê11†

Revision A 7-9
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

To enter the information required for pressure altitude calculations:

• Press .

• Rotate the to move through the editable fields.

• Rotate the to change the data in the selected field.

• Press to accept the changes.

A change in barometric setting or indicated altitude initiates new

calculations in related fields, according to the chart below:

Changed Field Calculation Affected

Barometric Setting Pressure Altitude
Indicated Altitude Pressure Altitude

Changes made for pressure altitude will be reflected in the Density

Altitude and TAS displays.

7.3.2 Density Altitude Calculations

• Press to access the Air Data mode.

• Rotate the knob to display the Density Altitude

Calculations page.
The Density Altitude page provides the following information:

• Density Altitude in thousands of feet or thousands of

meters.
• Ram Air Temperature (degrees Celsius) - the Total Air
Temperature as indicated on an uncorrected temperature
probe (typically labeled OAT in light aircraft and RAT in
corporate/commercial aircraft. See True Airspeed Calcula-
tions section for a complete definition).
• Pressure Altitude in thousands of feet or thousands of
meters.

7-10 Revision A
February 28, 1997
 Chapter 7 The Calculator Key

In the example shown below, the Density Altitude page indicates that
density altitude is 13,300 feet; the Ram Air Temperature (Total Air
Temperature) is 19° Celsius; pressure altitude is 10,500 feet.

DENSITYêALTITDEê13ƒ
RATê19½êPRSêALTê10…

To enter the information required for density altitude calculations:

• Press .

• Rotate the knob to move through the editable fields.

• Rotate the knob to change the data in the selected

field.

• Press to accept the changes.

A change in either RAT or pressure altitude initiates new calculations

in related fields, according to the chart below:

Changed Field Calculation Affected

RAT Density Altitude
Pressure Altitude Density Altitude
Density Altitude RAT

7.3.3 True Airspeed (TAS) Calculations

• Press to display the Air Data mode.

• Rotate the knob to access the True Airspeed Calcula-

tions page.

Revision A 7-11
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

The True Airspeed page provides the following information:

• True Airspeed in knots, statute miles per hour, or kilome-

ters per hour.
• Outside Air Temperature (OAT, degrees Celsius) the True
Air Temperature of the ambient corrected for temperature
rise, compressibility, etc.
• Mach Number (non-dimensional) True Airspeed divided
by Speed of Sound at current Pressure Altitude.
• Indicated Airspeed in knots, statute miles per hour, or
kilometers per hour.
• Ram Air Temperature (RAT, degrees Celsius) - the Total
Air Temperature as indicated on an uncorrected tempera-
ture probe .
For an Indicated Airspeed of 321 knots, Ram Air Temperature of +14°
C, and a Pressure Altitude of 20,000 feet (not displayed on this page),
the True Airspeed page shown below indicates that the True Airspeed
is 438 knots, true Outside Air Temperature is -11 ° C, and Mach
number is .69.

TASê438‹êOAT-11½êM†ì
IASê321‹êRATê14½

OAT and TAS presented on the CALC-TAS page are dependent on

the “K” Factor used in the initial configuration of the unit. This “K”
Factor only applies to the standard Ram Air Temperature gauge
located on the instrument panel and is only used to determine the true
Outside Air Temperature (OAT) for manual TAS calculations as
described below. When an Air Data Computer (such as the Shadin
ADC 200) is installed in the aircraft, displayed ADC parameters
generally are based on a “K” Factor of 1.0.

To enter the information required for true airspeed calculations:

• Press .

• Rotate the knob to move through the editable fields.

• Rotate the knob to change the data in the selected

field.

• Press to accept the changes.

7-12 Revision A
February 28, 1997
 Chapter 7 The Calculator Key

For manual calculations, ensure that the desired Pressure Altitude

has been entered on the previous CALC page.

A change in IAS, RAT, TAS, OAT, or Mach initiates new calculations

in related fields, according to the chart below:

Changed Field Calculation Affected

IAS TAS, OAT, Mach
RAT TAS, OAT
TAS OAT, Mach, IAS
OAT TAS, RAT
Mach TAS, OAT, IAS

Changes made in TAS calculations will be reflected in the Winds Aloft

calculations.

7.3.4 Winds Aloft Calculations

• Press to access the Air Data mode.

• Rotate the knob to display the Winds Aloft Calcula-

tions page.
The Winds Aloft page provides the following information:

• Wind Direction and Speed

• True Airspeed and Heading

The Winds Aloft page shown below indicates that the wind is from 25°
true at 28 knots, given a true airspeed of 153 knots and a heading of
070°. Wind direction is given in degrees TRUE, not degrees mag-
netic.

WINDê’êê25­ê‘êatê28‹
êêêTASê153‹êHDGêê70­

Revision A 7-13
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

This page determines the winds aloft based on

(1) the current track and ground speed from the NAV page,
(2) magnetic variation,
(3) the TAS from the TAS page, and
(4) the manually-entered HDG, or the current heading from
the aircraft’s compass system

To enter information required for Winds Aloft calculations:

• Press .

• Rotate the knob to move through the editable fields.

• Rotate the knob to change the data in the selected

field.

• Press to accept the changes.

A change in either the TAS or heading fields initiates new calcula-

tions in related fields, according to the chart below:

Changed Field Calculation Affected

TAS Wind Speed, Wind Direction
Heading Wind Speed, Wind Direction

7-14 Revision E
April 27, 1998
 Chapter 7 The Calculator Key

7.3.5 Crosswind and Head Wind Calculations

• Press to access the Air Data mode.

• Rotate the knob to display the Crosswind and Head

wind Calculations page.
The Crosswind and Head wind page provides the following informa-
tion:

• Crosswind
• Head wind
• Runway Direction
• Wind Direction (magnetic) and Speed
The Crosswind and Head wind page shown below indicates that the
crosswind component is 16 knots; the Head wind component is 19
knots for runway 31, when the wind is from 270° True at 25 knots.

X-WINDê16‹êêHEADê19‹
êRWYê31êWNDê270­ê25‹

To enter the information required for crosswind and head wind

calculations:
• Press .

• Rotate the knob to move through the editable fields.

• Rotate the knob to change the data in the selected

field.

• Press the key to accept the changes.

A change in either the runway number, wind direction or wind speed

initiates new calculations in related fields, according to the chart
below:

Changed Field Calculation Affected

Runway Number Crosswind, Head wind
Wind Direction Crosswind, Head wind
Wind Speed Crosswind, Head wind

Revision A 7-15
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

7.4 Saving the Present Position

The Save Present Position mode is used to save the aircraft’s present
position. The Navigator provides 10 phonetic waypoints, alpha-juliet,
for temporary storage of present position waypoints. Each time you
save present position, the Navigator stores the position in the next
phonetic waypoint, overwriting that waypoint. After 10 consecutive
saves, the alpha waypoint is overwritten.

To save a present position:

• Press to access the Save Present Position Mode.

PRESSê(ENT)êTOêSAVE
POSITIONêTOêalpha

• Press to save the present position.

7.4.1 Copy a Phonetic Waypoint

You may save any phonetic waypoint by copying it to a user waypoint.

• Press until you get to the USER mode.

• Use the knob to view the phonetic waypoint of interest.

For example, chrly.

• Rotate the knob one click either direction to display

“EDIT chrly? (ENT)”.

• Press .

• Use the selector knobs to change the name.

• Press .

7-16 Revision A
February 28, 1997
 Chapter 7 The Calculator Key

7.5 Vertical Navigation Profiles

Vertical Navigation (VNAV) can be used for climb or descent profiles.
The Navigator creates a VNAV profile to the active waypoint based on
the current ground speed.

The calculation is made using a pilot-entered starting altitude,

ending altitude, desired rate (or angle) of descent or climb, and the
desired distance from the active waypoint for the ending altitude.
Using this information, the Navigator calculates the VNAV descent or
climb starting point and the altitude required to follow the profile.

Press to display the advisory messages indicating when the

level-off point has been reached.

The illustration below shows a descent is from 12,500 feet to 10,500

feet at a rate of 200 feet per minute. The active waypoint is the Santa
Monica VOR at 10,500 feet.

Revision E 7-17
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

To enter VNAV profile information:

• Press to access the NAV Profile mode.

STARTING ALTITUDE ENDING ALTITUDE

VNAV:onêê12…êŽê10…
êê200:ê29¡ê’SMO·

DISTANCE
DESCENT/CLIMB ACTIVE
RATE WAYPOINT

• Press .

• Rotate the clockwise to turn VNAV on.

• Rotate the to move to the next editable field.

• Use the to change the starting altitude.

• Use the selector knobs to continue moving through and

changing the editable fields.

• Press to save the changes.

View VNAV Profile information under the key.

7-18 Revision E
April 27, 1998
 Chapter 8 The Auxiliary Key

Chapter 8
The Auxiliary Key
Use the key to control and monitor information in the Navigator.
The key features six modes:

• Checklist
• DGPS Tuning
• System Status
• Sensor Status
• Configure
• User Setup
Once the desired mode is selected, rotate the and knobs to
access additional information displays.

Revision E 8-1
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

Auxiliary Mode Features

Checklist
User entered checklists, Custom Data, Commonly Used
Frequencies, etc.

DGPS Tuning
Channel Tune, Airport Tune, Runway Tune, Final Approach
Segment (FAS) Tune, Enter VDL Tuning

System Status
Date/Time, Present Position, System Operating Conditions,
Data Base, and Software Revisions.

Sensor Status
GPS Status and Accuracy, Satellite Data, GPS Availability,
Approach RAIM Availability.

Configure
Parallel Offset, I/O Interface Check, Dead Reckoning/Demo
Mode, Display Diagnostic.

User Setup
If this mode is available, it will include Search Regions,
Airwatch, Safeguard/Personal Message, Save/Load Configura-
tion.

8-2 Revision E
April 27, 1998
 Chapter 8 The Auxiliary Key

8.1 The Checklist Mode

Use the checklist mode to create up to 10 custom checklists with up
to 26 entries each.

8.1.1 Creating and Naming Checklists

To create and name a customized checklist:

• Press to access the Checklist mode.

The checklist message flashes on the screen and then the title for
the last selected checklist is displayed. If no checklists have been
created, the Navigator displays:

êêêNOêCHECKLISTS

• Rotate the knob until the following display appears:

ê0:êINSERTêATêSTART
INSERTêLISTê0ê(ENT)

• Press .

• Rotate the knob to select the first letter or number in

the name field.

• Rotate the knob to move to the next space in the field

and select the next character using the knob.

• Continue this process to finish the entry.

• Press when the entry is complete.

Revision A 8-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

The checklist number is listed on the top line of the display shown
below. The first item in the list, A, is listed on the bottom line.

INSERTê0Aêêêêêê(ENT)
êA:

• Press .

• Rotate the knob to select the first letter or number of

the checklist item.

• Rotate the knob to move to the next space in the field

and select the next character using the knob.

INSERTê0Bêêêêêê(ENT)
êB:êINSERTêATêEND

• Continue this process to finish the entry.

• Press when the entry is complete.

The Navigator will display:

Continue this process until all items (up to 26) are entered in the
checklist. Press the key to store the checklist.

To enter another checklist:

• Rotate the knob until the bottom line of the Navigator

displays “INSERT LIST 0 (ENT)”.

• Rotate the knob until the Navigator displays:

ê1:êINSERTêATêEND
INSERTêLISTê1êê(ENT)

• Press and enter a new checklist as described

previously.

8-4 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

8.1.2 Using a Checklist

You can access a checklist at any time during flight.

To activate a checklist:
• Press to access the Checklist mode.

• Rotate the knob to select the desired list.

0:êFIRST
A:êFUELêPUMP

To check off the first item in the list:

• Press .

0:êFIRST

A checkmark appears next to the item and the Navigator displays the
next item on the list. After all the items on the list have been checked
off, a checkmark is displayed next to the list name.

Rotate the knob to go to the next list.

You may exit the Checklist mode at any time by pressing any key.
When you return to the Checklist mode, the Navigator returns to the
last checklist displayed. You can proceed with checking off items as
though there had been no interruption. The check marks will remain
until the Navigator is powered down.

Revision A 8-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.1.3 Editing a Checklist

Once a checklist is created, you can edit the checklist name or any of
the items in the list.

To edit an entry in a checklist:

• Press .

• Rotate the knob to select the list to be edited.

• Rotate the knob until the Navigator displays the “EDIT

LIST” option:

0:êFIRST
EDITêLISTê0êêê(ENT)

• Press .

• Rotate the knob to select the item in the checklist or

the checklist title to be edited.

• Press .

EDITê0êTITLEêê(ENT)
ê0:êTAKEOFF

• Rotate the knob to change the character.

• Rotate the knob to move the cursor to the next

character.

• Continue this process to finish updating the entry.

• Press when the entry is complete.

• Rotate the knob to select another item in the checklist

to edit, or

• Press to complete editing.

8-6 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

8.1.4 Inserting and Deleting Checklist Items

Once a checklist is created, you can add or delete items.

To insert a new item into a checklist:

• Press to access the Checklist mode.

• Rotate the knob to select the list to be edited.

• Rotate the knob until the “EDIT LIST” message is

displayed.

ê0:êTAKEOFF
EDITêLISTê0êêêê(ENT)

• Press .

• Rotate the knob until the Navigator displays:

INSERTê0Aêêêêêê(ENT)
êA:êALTIMETER

• Rotate the knob to select the position in the checklist

in which to insert the new item.

• Press .

• Using the selector knobs, enter the new item.

• Press .

• Edit more items or press to complete editing.

Revision A 8-7
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

The new item is inserted into the checklist as the new item B. The
former item B and all the following items move down one position.

To delete an item from the checklist:

• Press to access the Checklist mode.

• Rotate the knob to select the list to be edited.

• Rotate the knob until the “EDIT LIST” message is

displayed.

• Press .

• Rotate the knob to select the item in the checklist to

delete.

• Rotate the knob until the Navigator displays:

• Press to delete the item.

DELETEê0Cêêêêêê(ENT)
êC:êALTIMETER

• Press to confirm the deletion. (Press any other key

to abort the deletion process.)

When an item is deleted from a checklist, all the remaining checklist

items move up one position.

8-8 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

8.1.5 Deleting a Checklist

Once a checklist is created, the checklist may be deleted.

To delete a checklist, follow these steps:

• Press to access the Checklist mode.

• Rotate the knob to select the list to be deleted.

• Rotate the knob until the “DELETE LIST” message is

displayed.

ê2:êLANDING
CONFIRMêDELETEê(AUX)

• Press .

• Press to confirm the deletion.

When a checklist is deleted, all the lists that follow move up one
position.

Revision A 8-9
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.2 The System Status Mode

The System Status mode provides quick access to system status
information. The six status pages include the following:

• Date/Time Display

• Present Position/Latitude and Longitude Information

• Voltage and Internal Temperature Display

• Database Expiration Information

• Software Revision Information

• Software Code Display

8.2.1 The Date/Time Display

The first page in the System Status function displays the local date,
Zulu (UTC) time, time zone and local time.

The Time page shown below indicates that the current date is
February 28, 1997; the day is Friday; the time is 6:29, the time zone is
Pacific Standard Time; the current Zulu time is 14:28:53. When GPS
Satellites are available, the time and date are set automatically.

FRIDAYêêêê28-FEB-97
15:04:57zêPSTê07:04

8-10 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

Time zones are selected from the following list:

PST Pacific Standard Time

PDT Pacific Daylight Savings Time
MST Mountain Standard Time
MDT Mountain Daylight Savings Time
CST Central Standard Time
CDT Central Daylight Savings Time
EST Eastern Standard Time
EDT Eastern Daylight Savings Time
AST Atlantic Standard Time
ADT Atlantic Daylight Savings Time

Pre-programmed time zones are not available for International use.

For operation outside of North America, enter the time offset from
UTC. For example, the time offset for Melbourne, Australia would be
UTC + 10.

Revision A 8-11
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.2.2 The Present Position Display

The Present Position page displays the aircraft’s current position in

one or two coordinate systems.

• Press to access the System Status mode.

• Rotate the knob to display the Present Position page.

PRESENTêPOSITION
“37­23…¨ª¶122­02‚¨³

8.2.2.1 The Altitude Display

The Altitude page displays the current altitude and altitude source. In
case of an altitude source failure, use this page to enter a manual
altitude for use by the GPS receiver.

To access the Altitude page:

• Press to access the System Status mode.

• Rotate the knob to display the Present Position page.

• Rotate the knob to display the Altitude page.

The Altitude page below indicates the current altitude is 10,253 feet
and the source is pressure, with the GPS 3D altitude available as a
backup.

ALTITUDE:ê10253Æ
SOURCE:êPRS/GPS-3D

Your altitude encoder provides pressure altitude to the Navigator in

compliance with TSO C-129. This pressure altitude augments the
GPS position and RAIM computations, extending the RAIM coverage
in cases where satellite coverage alone is inadequate for 3D
position solutions and RAIM. In case of external altitude source
failure and 2D GPS operation, you may enter altitude manually. If the
external altitude source is valid or the GPS is operating in 3D mode,
the Navigator will not accept manual altitude input.

8-12 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

Depending on the GPS mode and the state of the aircraft altitude
encoder input, you may see any of these altitude sources:

BARO/GPS-3D

The altitude source is BARO from an Air Data Computer.

The GPS is operating in 3D, GPS computed altitude is
available.

BARO/GPS-2D

The altitude source is BARO from an Air Data Computer.

The GPS is operating in 2D mode, no GPS altitude is
available.

PRS/GPS-3D

The altitude source is pressure from the encoder. The

GPS is operating in 3D, GPS computed altitude is
available.

PRS/GPS-2D

The altitude source is pressure from the encoder. The

GPS is operating in 2D mode, no GPS altitude is
available.

GPS-3D

The altitude source is GPS 3D computed altitude.

HELD/GPS-2D

The altitude source is held at the last known value. The

GPS is operating in 2D mode, no GPS altitude is
available.

MANUAL/GPS-2D

The altitude source is your manual entry. The GPS is

operating in 2D mode, no GPS altitude is available.

OLD

The Navigator is not receiving external altitude nor

computing GPS solutions.

Revision A 8-13
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.2.2.2 Entering Manual Altitude

To enter a manual altitude when the source is HELD, MANUAL or

OLD:

• Press to access the System Status mode.

• Rotate the knob to display the Present Position page.

• Rotate the knob to display the Altitude page.

• Press .

• Use the selector knobs to set the altitude.

• Press .

8.2.2.3 Pressure Altitude and GPS Altitude

• Press to access the System Status mode.

• Rotate the to display the Present Position page.

• Rotate the knob to the right to view the current

pressure and GPS altitudes.

The display below indicates that the current pressure altitude is

10,250 feet and GPS altitude is 9,843 feet.

PRESêALTê10250ê
GPSêALT:ê9843Æ

When the altitude source is not available and altitude is displayed as

dashes (for either pressure or GPS altitude).

8-14 Revision E
April 27, 1998
 Chapter 8 The Auxiliary Key

8.2.3 The Voltage and Temperature Display

• Press to access the System Status mode.

• Rotate the knob to display the Voltage and Tempera-

ture page.

The Voltage and Temperature page below indicates that the input
voltage is 14.2 volts; temperature inside the unit is 33o Celsius.

INPUTêVOLTAGE:ê14.2V
INTERNALêTEMP:êê33­C

8.2.3.1 The Crystal Offset and Memory Battery Display

This page provides maintenance information.

• Press to access the System Status mode.

• Rotate the knob to display the Voltage and Tempera-

ture page.

• Rotate the knob to select the Crystal Offset page.

The GPS Receiver Crystal Offset page below indicates that the
crystal frequency offset is 13 Hz from nominal and the memory
battery is 3.67 volts.

CRYSTLêOFFSET:êê13Hz
MEMORYêBATTERY:3.67·

Revision A 8-15
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.2.3.2 The GPS Antenna Display

This page provides maintenance information.

• Press to access the System Status mode.

• Rotate the knob to display the Voltage and Tempera-

ture page.

• Rotate the knob to display the GPS Antenna page.

The GPS Antenna page display shown below indicates that the
voltage across the antenna leads is currently 4.36 volts and the
current is 65 milliamps.

GPSêANTENNA:êêê4ƒ¨êV
êêêêCURRENT:êêêê65mA

8.2.4 The Database Expiration Display

The Database Expiration page displays the expiration date of the

NavData card.

• Press to access the System Status mode.

• Rotate the knob to display the Database Expiration

page.

The Database Expiration page below indicates that the current

database expires on March 25, 1997.

DATABASEêEXPIRATION
êêêêê25-MAR-97

8-16 Revision E
April 27, 1998
 Chapter 8 The Auxiliary Key

8.2.5 The Software Revisions Display

• Press to access the System Status mode.

• Rotate the knob to access the software revisions

page.

The Trimble 2101 I/O Approach Plus GPS Navigator contains three
processors, each with its own software code:

• Navigation and I/O Processor

• GPS Processor

• AUX I/O Processor

REVISION::êêNAV2†¤¢
GPS5€¤-0812êAIO0110

The Software Revisions page lists the software revision numbers.

8.2.6 The System Code Display

• Press to access the System Status mode.

• Rotate the knob to display the System Code page.

The System Code page lists the system revision for the Trimble
2101 Approach GPS Navigator software. This revision number
matches the last four digits of the unit part number found on the ID
plate.

SYSTEMêCODE:ê0241
êêêêêêc1997

Revision A 8-17
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.3 The Sensor Status Mode

The Sensor Status mode allows quick access to sensor diagnostic
information as well as the system navigation mode. The sensor
status pages include the following:

• GPS Status

• Estimated Accuracy

• GPS Satellite Status

• GPS Sensor Reset

• GPS Satellite Availability

• Approach RAIM Availability

8.3.1 GPS Sensor Status

The GPS Status page displays current operating mode, RAIM mode,
and Position Dilution of Precision (PDOP).

RAIM provides verification that GPS accuracy is sufficient for use as a

supplemental means of navigation during IFR En-route, Terminal,
and Non-precision Approach operations. In the event “RAIM” status
reverts to “NO RAIM”, use of GPS for en route navigation is still
approved, but must be cross-checked with VOR, DME, etc.

PDOP is a measurement of the geometry of the satellites. The

smaller the number, the greater the precision.

To access the GPS Status Display:

• Press to access the Sensor Status mode.

The GPS Status page indicates that the GPS receiver is computing
position in three dimensions, pressure altitude is available, RAIM is
active, RAIM Mode is “Approach”, and the Position Dilution of Preci-
sion is 1.6.
GPS
RAIM
mode
status
GPS:ê3D/PRSêêêêêRAIM
MODE:êAPRêêêPDOP:ê1†
RAIM
mode

8-18 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

An explanation of the GPS status codes follows.

3D/BARO
The GPS is operating in 3D, external baro altitude input is
available.
3D/PRS
The GPS is operating in 3D, external pressure altitude
input is available.
3D
The GPS is operating in 3D, no external altitude source is
available
2D+ BARO
The GPS is operating in 2D using external baro altitude
in the position solution.
2D+PRS
The GPS is operating in 2D using external pressure
altitude in the position solution.
2D+HELD
The GPS is operating in 2D using the last known altitude
in the position solution.
2D+MANL
The GPS is operating in 2D using pilot entered altitude in
the position solution.
RAIM status will display:

RAIM
Receiver Autonomous Integrity Monitor is active.
NO RAIM
Receiver Autonomous Integrity Monitor can not provide
the required integrity for phase of flight; use of GPS for
navigation is still approved, but must be cross-checked
with VOR, DME, etc.
RAIM/B
Receiver Autonomous Integrity Monitor is active and
using automatic altitude aiding.

Revision A 8-19
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

RAIM mode will display:

TERM
RAIM to terminal limits of TSO C-129.
APR
RAIM to approach limits of TSO C-129
PDOP varies according to the positional relationship of the satellite
in view.

8.3.2 Estimated Accuracy

The Navigator computes an estimate of the worst case position error

based on the accuracy of the signals and the geometry of the GPS
Satellites. This estimate is displayed on the Estimated Accuracy
page.

To display the Estimated Accuracy page:

• Press to access the Sensor Status mode.

• Rotate the knob counterclockwise.

ESITMATEDêACCURACY:
GPS:0€¤¡

8-20 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

8.3.3 GPS Satellites Tracked Display

• Press to access the Sensor Status mode.

• Rotate the knob clockwise.

The GPS Satellites Tracked page displays the identification numbers

of all the Space Vehicles (SVs) being tracked by the Navigator.

The GPS Satellites Tracked page below indicates that the GPS
receiver is currently tracking nine satellites. The satellites being
tracked are numbers 1, 9, 12, 15, 21, 23, 25, 28, and 31. The Trimble
2101 Approach GPS Navigator tracks all satellites in view.

GPSêTRACKêê9:ê31ê28
ê1ê9ê12ê15ê21ê23ê25

A flashing number on the GPS Track page indicates that the associ-
ated satellite is being tracked but not used in the position solution
due to poor signal strength, bad geometry, manual deselection, or
classification of satellite as unhealthy.

8.3.4 GPS Satellite Status Display

The GPS Satellite Status page displays elevation, azimuth, and

signal level for each satellite.

To access the GPS Satellite Status Display:

• Press to access the Sensor Status mode.

• Rotate the knob clockwise.

The GPS Satellite Status page below indicates that satellite (SV for
Space Vehicle) number 3 is being received with a signal to noise
ratio of 10.0; it is currently at an elevation of 29° above the horizon
and an azimuth of 248° true.

GPSêSV:ê03êêSIGê10.0
êêêELVê029­êAZMê248­

Revision A 8-21
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

If a negative elevation appears in this page, it is an indicator that the

satellite is below the horizon and not available for use.

To access information on other satellites, rotate the knob. You

may view the status of all satellites whether or not they are currently
being tracked.

8.3.4.1 Satellite Database

You may prohibit the GPS receiver from using any satellite in the
constellation by disabling that SV from the Satellite Status Page. You
should only disable a satellite due to a NOTAM about that satellite.

To disable a satellite:
• Press to access the Sensor Status mode.

• Rotate the knob to view the desired satellite.

• Press .

• Rotate the knob to disable the SV.

GPSêSV:ê03êDISABLED
êêêELVê029­êAZMê248­

• Press .

To enable a satellite previously disabled:

• Press to access the Sensor Status mode.

• Rotate the to view the desired satellite.

• Press .

• Rotate the knob until the ENABLE or SIG is displayed.

• Press .

When the Navigator is turned off then back on, all manually disabled
satellites are re-enabled.

8-22 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

8.3.5 GPS Sensor Reset

The Sensor reset causes the GPS receiver to go through its power-
on and satellite acquisition sequence as if the unit had been turned
off and on.

• Press to access the Sensor Status mode.

• Rotate the knob clockwise to display the GPS Sensor

Reset page.

RESETêGPSêSENSOR?
êêêêêêêêêêêêêêê(ENT)

• Press .

• Press to confirm reset.

Revision A 8-23
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.3.6 GPS Satellite Availability

The availability page provides coverage predictions for the current

location at any date or time.

• Press to access the Sensor Status mode.

• Rotate the knob clockwise to view the display shown

below.

The Satellite Availability page shown below indicates that GPS three
dimensional positioning is available 24 hours at the current location
on September 19, 1996.

GPSêAVAIL:ê19-SEP-96
3-D:ê24êHRêCOVERAGE

If coverage is less than 24 hours, use the knob to view the next
available satellite navigation period.

Enter a specific date or to select between visibility computation for

two or three-dimensional positioning:

• Press .

• Use the selector knobs to change the date.

• Press to compute.

The position used for satellite visibility computations is the last

computed fixed position. If the Dead Reckoning (DR) mode has
been set, the visibility will be computed for the present DR position.

8-24 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

8.3.7 Approach RAIM Availability

The Approach RAIM Available page provides RAIM predictions for

your destination airport ±15 minutes of your ETE, through the flight
plan.

The Approach RAIM Available page also provides RAIM prediction for
any Airport and Time entered by the User. To access the function:

• Press to access the Sensor Status mode.

• Rotate the knob clockwise to display the

Approach RAIM Availability page.

APRêRAIMêAVAILABLE:
AUS®ê17:37±êé15êMIN

When an Approach is active, or your flight plan ends with an airport,

the associated Airport will automatically be displayed along with the
time of arrival through the flight plan.

To determine Approach availability at any Airport:

• Press .

• Rotate the knob to move between the Airport field and

the Time field.

• Rotate the knob to change the Airport ID and/or Time

as required.

In the event RAIM is not available at the selected Airport and Time,
the following will be displayed:

RAIMêNOTêAVAILABLE:
SJC®ê15:37±

Revision A 8-25
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.4 The Configure Mode

The configure mode is used to establish parameters for the follow-
ing:

• Parallel Track Offset (PTK)

• I/O Interface Check

• Dead Reckoning/Demo Mode

• Display Diagnostic

8.4.1 Selecting a Parallel Offset

Parallel track offsets from 99.99 nm left to 99.99 nm right are

available from the parallel offset page. A parallel offset changes the
displayed cross track error and the CDI, it does not affect the course
or distance to the next waypoint. The PTK annunciator is lit when you
select an offset other than 0.0 nm.

The Navigator features two Parallel Offset modes:

Auto Cancel In this mode, the Navigator automatically cancels

the offset when you pass the last waypoint in the
flight plan.

No Cancel In this mode, the Navigator retains the offset

beyond the last waypoint in the flight plan.

When the PTK annunciator is lit, you may view the selected offset
from the key.

Once you have selected an offset, the Navigator maintains that offset
through the remainder of the flight plan or until cancelled.

The Navigator cancels the offset after any operation.

When an approach is enabled, the Navigator cancels the parallel

offset and prohibits additional offset selection while the approach is
enabled.

8-26 Revision A
February 28, 1997
 Chapter 8 The Auxiliary Key

To access the Parallel offset feature:

• Press to access the Configure mode.

• Rotate the knob to display the Parallel Offset page.

PTKêOFFêêAUTOêCANCEL
ê3€¢¡êRIGHT

The display above indicates a parallel offset of 3 nautical miles, an

offset direction of Right and Auto Cancel mode.

To select a Parallel Offset:

• Press . The Navigator displays the last selected

offset value, direction and mode.

• Use the selector knobs to choose the offset value,

direction and mode.

• Press . The PTK annunciator lights.

8.4.2 I/O Interface Check

The Configure mode provides of a means of verifying the CDI, flags,

and external annunciators.

To access the I/O Interface Check page:

• Press to access the Configure mode.

• Rotate the knob to display the I/O Interface Check

page.

• Press .

TESTêCDIê#1:5L
USEêKNOBêêêêêêêêê(ENT)

Revision A 8-27
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.4.3 The Dead Reckoning Display - Demo Mode

Use the Dead Reckoning Demo mode to simulate the Navigator in-
flight operation while on the ground. In this mode, you enter ground
speed and ground track under the NAV key to simulate flight. This
mode is not available when the Navigator is receiving enough
satellite signals to navigate. In order to use this mode, you must
have the aircraft hangered, the antenna covered or deselect all
satellites.

To select DEMO operation:

• Press to access the Configure mode.

• Rotate the knob to display the Dead Reckoning page.

When the demo mode is not available because the Navigator is
receiving enough satellites to navigate, it displays:

DEADêRECKONING:êêOFF

When the demo mode is available, the Navigator displays:

DEADêRECKONING:êêêON
ê(DEMOêMODE)êêê(ENT)

To select a starting position for your demonstration flight:

• Press .

• Use the standard method of selecting a waypoint from

the WPT or NRST mode.

• Press .

Activate a flight plan to fly.

8-28 Revision E
April 27, 1998
 Chapter 8 The Auxiliary Key

To simulate flight, enter a ground speed and track:

• Press to access the Primary NAV Mode display.

• Press .

ŽLAX®ê120­ê143¡ê7:43
{ÕÞÕÞÛÞÕÞÕ}Ÿ124­250‹

• Rotate the knob to move among the editable fields.

• Rotate the knob to set the ground track and ground

speed values.

• Press .

The entry is now complete and the Dead Reckoning/Demo mode is

enabled. You may now use the Demo mode to demonstrate the
Navigator features.

Update ground speed and track as desired. At every track change,

the Navigator will set track to an appropriate intercept value for the
new leg. Change track as you like.

Upon reaching the last waypoint in the flight plan, the Navigator will
set ground speed to zero.

The Navigator will not illuminate the approach light in the demo
mode. Since RAIM is not available, the Navigator behaves accord-
ingly; at the FAF-MAP track change, the HLD light illuminates,
indicating that the Navigator will not automatically sequence at the
MAP and the APR light does not illuminate.

Revision A 8-29
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

8.4.4 The Display Diagnostic Page

Use the Display Diagnostic page to check the display and internal
annuciator lights.

To access the Display Diagnostic page:

• Press to access the Configure mode.

• Rotate the knob to display the Display Diagnostic

page.
The “DISPLAY DIAGNOSTIC” message appears briefly. Then the
display changes to dashed horizontal lines. Horizontal lines move
through all the fields of both lines of the display. The annunciator
lights and push-button keys light in sequence. This pattern contin-
ues until you turn the selector knobs or press a key. This display
allows a visual check to determine if these features are operating
properly.

8.5 User Setup Mode

The User Setup mode, if available, allows you to configure the
Navigator to your specific needs. You can choose the database
search regions, set the AIRWATCH feature to your specification,
secure the Navigator, and save or load the Navigator’s configuration.
Instructions for the User Setup mode are in Appendix C.

8.6 DGPS Tuning Mode

The DGPS Tuning Mode is used to tune the following for DGPS
approaches:

• Channel

• Airport

• Runway

• Final Approach Segment

You must enter the DGPS tuning data before reaching the approach
phase of your flight.

8-30 Revision E
April 27, 1998
 Chapter 8 The Auxiliary Key

Access the DGPS Tuning Mode by pressing the key to display

the DGPS tuning page then follow the steps below to tune the DGPS
data:

To tune the desired Channel:

• Rotate the clockwise to display:

CHANNELêêTune:000-
êêêêêReadback:----

• Press .

• Rotate the to set the first character of the channel.

• Rotate the to move the cursor to the next field.

• Rotate the to set the next character.

• Continue until the correct channel is displayed.

• Press to save the changes.

To tune the desired Airport:

• Rotate the clockwise to display:

AIRPORTêêTune:
êêêêêReadback:----

• Press .

• Rotate the to set the first character of the airport

identifier.

• Press .

• Rotate the to move the cursor to the next field.

Revision E 8-31
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

• Rotate the to set the next character.

• Continue until the desired airport identifier is displayed.

• Press to save the changes.

To tune the desired Runway for the approach:

• Rotate the to display:

RUNWAYêêTune:--
êêêêêReadback:---

• Press .

• Rotate the to set the first character of the desired

runway.

• Rotate the to move to the next field.

• Rotate the to set the next character.

• Continue until the desired runway is displayed.

• Press to save the changes.

To tune the desired Final Approach Segment:

• Rotate the to display:

FASêêêêêêTune:
êêêêêReadback:-

• Press .

• Rotate the to select the desired Final Approach

Segment.

• Press to save the changes.

8-32 Revision E
April 27, 1998
 Chapter 8 The Auxiliary Key

8.6.1 Execute VDL Tuning

After the data for the approach is entered as described above, rotate
the to display the Tune page.

KAUSêRWY:13LêFAS:K
CH:135FêêêêTUNE(ENT)

The information you have entered cannot be edited from this page.
To change any of the information displayed, rotate the small knob to
go back to the appropriate tuning page and follow the instructions for
tuning that information.

To send this information to the VDL, press . If you do not press

at this point, the information will be stored until you cycle the
power on the unit.

After you press , the MSG annunciator light will begin to flash.
You can check the VDL status messages by pressing the key.
An explanation of the VDL status messages is located in Section
9.4.8.

After the VDL information has been sent and confirmation has been
received, the READBACK line of the tuning pages will display the
confirmed information.

Revision E 8-33
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

This Page Intentionally Left Blank

8-34 Revision E
April 27, 1998
 Chapter 9 The Message Key

Chapter 9
The Message Key
The Navigator keeps you apprised of all critical information that
relates to the current flight. A flashing MSG annunciator light prompts
you to view messages. If the Navigator is wired to your audio panel,
you also will hear a beeping tone anytime the MSG annunciator is
flashing.

This Chapter covers:

• Understanding flashing and non-flashing indicators

• Display messages
• Message priority
• Interpreting System, Parallel Track, and Advisory
messages

Revision A 9-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

9.1 Accessing Messages

The Navigator uses an internal and an external MSG annunciator light
to communicate special messages to the user.

New messages are indicated by flashing internal and external MSG

annunciators. Old messages that are still relevant cause the internal
message indicators to remain on. The external MSG annunciator
flashes only when there is an unread message; otherwise, it is off.

Messages are displayed in order of priority. New System messages

have highest priority:

New System
New Advisories
Old System
Old Advisories
Parallel Track Offset

9-2 Revision A
February 28, 1997
 Chapter 9 The Message Key

If a message is waiting, the MSG annunciator is illuminated. To

access messages:
• Press the key.

• The first message is displayed and the key is

illuminated.
The message below is an Advisory message indicating that the
installed Jeppesen NavData Card is out of date.

DATABASEêOUT-OF-DATE
EXPIREDê25-APR-96

The first message appears on the screen. If more than one message
is waiting, the key will remain lit. If this is the case, continue to
press the key and read through all waiting messages.

When the key is no longer lit, all messages have been viewed
and the Navigator is returned to the previous mode in use.

If a message continues to be relevant, the internal MSG annunciator

remains lit; the external annunicator is off. The message can be
viewed again by pressing the key.

Revision A 9-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

9.2 System Messages

New System messages are given highest priority and are always
displayed first.

The following is a list of System messages and an explanation for

each.

Message Condition Pilot Action

DEAD RECKONING The receiver is not doing Enter GS and Track from
ENTER GS & TRACK any position fixes. This NAV to operate in DR.
message is always issued
when the Navigator is first
turned on. It will extinguish
when the Navigator has
locked on to enough
satellites to navigate.

GPS POSITION The Navigator is no longer Normal system operation

RESTORED in Dead Reckoning mode. has been restored. Entry
of Ground Speed and
Track no longer required.

RAIM UNAVAILABLE The Navigator Plus is Cross check position with

unable to perform RAIM other approved navigation
due to insufficient sources.
satellites.

RAIM RESTORED The Navigator Plus is now Cross checking with other
receiving sufficient satellite sources is not required.
signals to perform RAIM.

GPS: RECEIVER FAIL The internal battery has System is inop.

BATTERY BACK-UP FAIL failed. As a result, all
stored waypoints and flight
plans were erased. All setup
data is lost.

GPS: RECEIVER FAIL BITE has detected a GPS Cross check position with
ALIGNMENT ERROR CH#1 receiver failure. other approved navigation
sources.

GPS: RECEIVER FAIL BITE has detected a GPS Cross check position with
ALIGNMENT ERROR CH#2 receiver failure. other approved navigation
sources.

GPS: RECEIVER FAIL BITE has detected a GPS Cross check position with
SIGNAL PROCESSOR ERR receiver failure. other approved navigation
sources.

GPS: RECEIVER FAIL BITE has detected a GPS Cross check position with
receiver failure. other approved navigation
sources.

9-4 Revision A
February 28, 1997
 Chapter 9 The Message Key

Message Condition Pilot Action

GPS: RECEIVER FAIL BITE has detected a GPS Cross check position with
I/O TIMEOUT receiver failure. other approved navigation
sources.

GPS DISABLED BY USER The Navigator has been left System is inop.
SEE INSTALL: SERIAL in a test mode. Contact
your maintenance facility
or the factory.
DATABASE MISSING 1. Turn unit off.
The database card is mising
2. Install databse card.
or is not instaled properly.
3. Restart unit.

DATABASE CARD TYPE 1. Turn unit off.

The installed NavData card
NOT VALID 2. Install correct databse
is invalid. Verify the data
card is an approach card. card for 2101 I/O Plus.
3. Restart unit.

1. Turn unit off.

EXTERNAL ALTIMETER The communication link
2. Install correct
LOST COMMUNICATION from the altitude serializer
database
(encoder) has failed.
card for 2101 I/O Plus.

EXTERNAL ALTIMETER Bad data was received 3. Restart unit.

IS IN ERROR from the altitude serializer Check altitude input
(encoder). This message source.
may appear due to warm-up
time required by external
altimeter source.

EXTERNAL ALTIMETER External altimeter source None

DATA OK now operating normally.

GPS: ANTENNA FAULT BITE has detected a GPS Cross check position with
antenna failure. other approved navigation
sources.

LOW VOLTAGE: The input voltage is below Check aircraft generator/

INPUT VOLTAGE: 10.6V 11V for a 14V aircraft or in alternator.
a range between 18V and
22V for a 28V aircraft.

WAYPOINT RECORD NOT The selected waypoint or Replace or delete the

FOUND IN DATABASE waypoint in the flight plan is waypoint.
not in the currently installed
database.

CROSS TRACK ERROR The difference between the Maneuver the aircraft to
GREATER THAN 4 ¡ current track and the intercept selected track.
desired track is greater than
four nautical miles. This
message is off unless
enabled during installation.

MANUAL MAGNETIC System was left in test System is inop.

VARIATION IN USE mode. Manually entered
magnetic variation is used
instead of computed
magnetic variation.

Revision A 9-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

Message Condition Pilot Action

AIR DATA COMPUTER: The fuel flow sensor to the Check fuel flow input
FUEL FLOW SENSR FAIL air data computer is not source.
working properly.

FAULT ON EXTERNAL BITE has detectd a short None.

APR ANNUNCIATOR circuit.

FAULT ON EXTERNAL BITE has detectd a short None.

HLD ANNUNCIATOR circuit.

FAULT ON EXTERNAL BITE has detectd a short None.

MSG ANNUNCIATOR circuit.

FAULT ON EXTERNAL BITE has detectd a short None.

WPT ANNUCIATOR circuit.

INTERNAL CDI: ±5.0¡ Indicates the current setting None.

EXTERNAL CDI: ±5.0¡ for the internal and external
CDI. This message is
always available.

RAIM ERROR RAIM has detected an error If flying an approach,

in the GPS position execute a Missed
solution. Approach. Cross check
position with other
approved navigation
sources.
POSITION IS OUTSIDE Operator has selected a grid None.
OF CURRENT GRID reference system other
than WGS84 and the
viewed position is outside
the selected system.

The following system messages will be displayed only with software

versions 241B and later.

Message Condition Pilot Action

GPS CONFIG INVALID The software configuration System is inop.
IFR NOT ALLOWED of the GPS does not match
the system definition

AIO CONFIG INVALID The software configuration System is inop.

IFR NOT ALLOWED of the Aux I/O does not
match the system
definition.

S/W CONFIG INVALID The software configuration System is inop.

IFR NOT ALLOWED of the GPS and the AUX
I/O do not match the
system definition.

9-6 Revision D
November 14, 1997
 Chapter 9 The Message Key
If one of the following messages is displayed, record the number (xx)
displayed and contact the factory.

Message Condition Pilot Action

PRCSSR BUS ERROR xx BITE has detected a System is inop.
CONTACT FACTORY system computer failure.

ADDRESS ERROR xx BITE has detected a System is inop.

CONTACT FACTORY system computer failure.

ILLGL INSTRUCTION xx BITE has detected a System is inop.

CONTACT FACTORY system computer failure.

ZERO DIVIDE xx BITE has detected a System is inop.

CONTACT FACTORY system computer failure.

CHECK REGISTER xx BITE has detected a System is inop.

CONTACT FACTORY system computer failure.

PRIVILEGE VIOLTN xx BITE has detected a System is inop.

CONTACT FACTORY system computer failure.

ILLEGAL INTERRUPT xx BITE has detected a System is inop.

CONTACTFACTORY system computer failure.

TRAP OVERFLOW xx BITE has detected a System is inop.

CONTACTFACTORY system computer failure.

STACK FULL ERROR xx BITE has detected a System is inop.

CONTACT FACTORY system computer failure.

MESSAGE ROUTINE BITE has detected a System is inop.

xxxxx NOT FOUND system computer failure.

ERROR IN MSG FIND BITE has detected a System is inop.

MESSAGE x NOT FOUND system computer failure.

Revision D 9-7
November 14, 1997
TRIMBLE 2101 I/O Approach Plus

9.3 AUX I/O Messages

Message Condition Pilot Action

AIO CARD FAIL The AUX I/O card is not System is inop.
functioning.

TRUE AIRSPEED The aircraft system Check TAS input source.

DATA INVALID supplying the Trimble 2101
Plus with true airspeed
information has failed.

PRESSURE ALTITUDE The aircraft system Check altitude input

DATA INVALID supplying the Trimble 2101 source.
Plus with pressure altitude
information has failed.

BAROMETRIC ALTITUDE The aircraft system Check altitude input

DATA INVALID supplying the Trimble 2101 source.
Plus with barometric altitude
information has failed.

HEADING DATA INVALID The aircraft system Check heading input

supplying the Trimble 2101 source.
Plus with heading
information has failed.

FUEL FLOW The aircraft system Check fuel flow input

DATA INVALID supplying the Trimble 2101 source.
Plus with fuel flow
information has failed.

AIO DISABLED BY USER This message will appear System is inop.

SEE INSTALL: SERIAL only during testing.

If one of the following messages is displayed, record the number

(XXXX) displayed and contact the factory.

Message Condition Pilot Action

AIO PROCESSOR FAILED The AUX I/O processor is System is inop.
ERROR CODE XXXX not functioning properly.

AIO SYNCHRO FAILED The AUX I/O synchro is not Synchro output to flight
ERROR CODE XXXX functioning properly. instruments are inop.

Steering and synchro

AIO LAMP FAILED The AUX I/O lamp drivers outputs are inop.
ERROR CODE XXXX have detected a short
circuit.

9-8 Revision D
November 14, 1997
 Chapter 9 The Message Key

9.4 Advisory Messages

Advisory messages are shown after any existing system messages.
The following are examples of Advisory messages and an
explanation for each.

9.4.1 Database Advisory Messages

Message Condition Pilot Action
DATABASE OUT-OF-DATE The database card has Verify navigation/route
EXPIRED 27 FEB 97 expired. data using current
information.

9.4.2 Flight Plan Advisory Messages

Message Condition Pilot Action

TURN TO 320° The Turn Anticipation None.
in 0:XX display will continuously
update to keep the pilot
apprised of the approaching
turn. Once this message is
displayed, the MSG
annunciator light remains lit
until display timer reaches
zero. This message is OFF.
See Section 8.

TURN TO INTERCEPT This message appears at Set HSI/CDI to displayed

NEW COURSE 320° each track change. It course.
displays the desired track of
the new leg.

EXECUTE HOLD PATTERN This message appears Set HSI/CDI to displayed

TO INBOUND CRS XXX° when the next leg is a course. Maneuver aircraft
holding pattern course to intercept the inbound
reversal. course to the holding fix.
Press NAV or MSG to
acknowledge.

EXECUTE P-TURN This message appears Manually execute the p-

TURN TO XXX° when the next leg is a turn according to
procedure turn. The published procedures.
suggested heading is the p- Press NAV or MSG to
turn outbound heading. acknowledge.

ARRIVAL AT PAO A When approaching final None.

WITHIN 59 SECONDS destination , the pilot
receives a countdown
advisory. This message is
OFF. See Section 8.

Revision D 9-9
November 14, 1997
TRIMBLE 2101 I/O Approach Plus

Message Condition Pilot Action

DESTINATION WAYPOINT The flight plan includes a Replace or delete waypoint
IS LAT 0.0 LON 0.0 waypoint that does not from the flight plan.
exist in the current
database card or in User
waypoint memory. Usually
due to the waypoint being
deleted or renamed in the
currrent database update.

DUPLICATE WAYPOINTS The flight plan contains 1) Review flight plan.

IN FLIGHT PLAN waypoint(s) that are 2) Edit as necessary.
identical to waypoints in
the procedure (SID,
STAR, APPROACH) just
added.

9.4.3 Approach Advisory Messages

Message Condition Pilot Action

APPROACH ENABLE? Enter current baro setting 1) Use knob to set the baro.
ENT BARO: 29.92 and enable the approach. 2) Press ENT to enable the
approach.

9.4.4 Parallel Track Advisory Messages

Message Condition Pilot Action

PARALLEL OFFSET Parallel offset was None.

CANCELLED cancelled. Any direct-to will
cancel the offset, as will
enabling an approach.

PTK OFF AUTO CANCEL Displayed when a parallel None.

10.00¡ RIGHT offset is selected. In this
example, parallel offset
has been set for 10 nm
right and the Auto Cancel
option has been selected.
The parallel track will be
cancelled, when an
approach is enabled, when
the course-to-destination
differs from the desired
track by 45º or more, or
when the “one minute to
arrival” message is
displayed.

9-10 Revision D
November 14, 1997
 Chapter 9 The Message Key

Message Condition Pilot Action

PTK OFF NO CANCEL In this example, parallel None.

10.00 ¡LEFT offset has been set for 10
nm left and the No Cancel
option has been selected.
The parallel track will not be
cancelled upon arrival at the
destination.

PTK OFF AUTO CANCEL Selected offset was None.

APPROACH ENABLED cancelled when the
approach was enabled.
Parallel offset cannot be set
while an approach is
enabled.

9.4.5 Fuel Management Advisory Messages

When the fuel on board is not zero, the following messages may
appear.

Message Condition Pilot Action

CAUTION: USING FUEL If the amount of time Verify fuel remaining.
RESERVE TO POAA remaining at current fuel
flow rate is less than the
time to reach the
destination plus the
amount of time you
selected on the Minimum
Fuel page under the
key (45 minutes is the
default), this advisory will
appear. This message is
deleted once viewed.

CAUTION: NOT ENOUGH The calculated fuel required Verify fuel remaining.
FUEL TO REACH PAOA to reach the destination on
the Fuel Management page
is more than the fuel
remaining on the Fuel
Remaining page. This
message is deleted once
viewed.

CAUTION: EXHAUSTED The flight time remaining Verify fuel remaining.

FUEL WITHIN 0:29 on the Fuel Remaining
page is less than 30
minutes (the timing on this
message can be edited
using the key). This
message is deleted once
viewed.

Revision D 9-11
November 14, 1997
TRIMBLE 2101 I/O Approach Plus

9.4.6 AIRWATCH™ Advisory Messages

When AIRWATCH™ is enabled, the Navigator displays advisories
regarding controlled and restricted airspace. A message to contact the
appropriate agency is wrapped on the second line of the display. The
frequency on which to contact the agency is also shown. Examples
are shown below.

Message Condition Pilot Action

INSIDE You are within the San Contact ATC
SAN FRANCISCO ClsB Francisco Class B airspace.

INSIDE
CONTACT BAY APP ON
Contact Bay approach on
INSIDE frequency 120.9.
BAY APP ON 120.9

CLOSE You are within 10 nm of the None.

R 2533 RESTRICTED R2533 restricted airspace.
There is no contact agency
or frequecy.

IN PATH You will enter the Santa Verify flight plan.

SANTA BARBARA Clsc Barbara Class C airspace in
approximately 10 minutes
on present track and speed.

IN FUTURE TRACK You will enter the Santa Verify flight plan.
SANTA BARBARA ClsC Barbara Class C airspace in
approximately 10 minutes
on present track and speed..

9.4.7 Other Advisory Messages

The following advisory message will be displayed only with software
versions 240B and later.

Message Condition Pilot Action

CLEAR BATTRY BACKED The unit has been reset None.
MEMORY SUCCESSFUL using the 3-finger reset and
the battery backed memory
has been successfully
cleared.

9-12 Revision D
November 14, 1997
 Chapter 9 The Message Key

9.4.8 VDL Messages

The following messages will be displayed with software versions
241C and later in aircraft using VDL tuning equipment.

Message Condition Pilot Action

VDL TUNING STATUS DGPS information has been None.
WAITING FOR DATA sent to the VDL and the
Navigator is awaiting
confirmation of the data.

VDL TUNING STATUS The Navigator has received None.

GROUND DATA confirmation from the VDL
RECEIVED that it is receiving ground
station data.

GNS STATUS The Navigator has deteced Lateral and vertical path
GNS FAIL ON PORT 1 a failure in the Global deviations for the
(2,3, or 4) Navigation Satellite Sensor approach are invalid.
Unit on Port 1 (2, 3, or 4). Supplemental navigation
is required for the
approach.

VDL STATUS The Navigator has detected DGPS approach tuning is

VDL FAIL a failure in the VHF Data not available.
Link (VDL).

Revision E 9-13
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

This Page Intentionally Left Blank

9-14 Revision E
April 27, 1998
 Appendix A Reference

Appendix A
Reference

Revision A A-1
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

A.1 State and Province Codes

The following codes are used to identify States and Provinces in the
Jeppesen North American NavData database listed in alphabetical
order by identifier.

State or Province Code State or Province Code

ALBERTA AB JAMAICA JAM

ANGUILLA AIA JOHNSTON IS JTN
ALABAMA AL ST KITTS KNA
ALASKA AK KANSAS KS
ARUBA ANT KENTUCKY KY
ARKANSAS AR LOUISIANA LA
ANTIGUA ATG ST LUCIA LCA
ARIZONA AZ MASSACHUSETTS MA
BRITISH COLUMBIA BC MANITOBA MB
BAHAMAS BHS MARYLAND MD
BELIZE BLZ MAINE ME
BERMUDA BMU MEXICO MEX
BARBADOS BRB MICHIGAN MI
CALIFORNIA CA MINNESOTA MN
CANADA CAN MISSOURI MO
COLORADO CO MISSISSIPPI MS
COLOMBIA COL MONTSERRAT IS MSR
COSTA RICA CRI MONTANA MT
CONNECTICUT CT MARTINIQUE MTQ
CUBA CUB NEW BRUNSWICK NB
CAYMAN ISLANDS CYN NORTH CAROLINA NC
DISTRICT OF NORTH DAKOTA ND
COLUMBIA DC NEBRASKA NE
DELAWARE DE NEWFOUNDLAND NF
DOMINICA DMA NEW HAMPSHIRE NH
DOMINICAN REPUBLIC DOM NICARAGUA NIC
FLORIDA FL NEW JERSEY NJ
GEORGIA GA NEW MEXICO NM
GUADELOUPE GLP NOVA SCOTIA NS
GRENADA GRD NEVADA NV
GUATEMALA GTM NORTHWEST
HAWAII HI TERRITORIES NW
HONDURAS HND NEW YORK NY
HAITI HTI OHIO OH
IOWA IA OKLAHOMA OK
IDAHO ID ONTARIO ON
ILLINOIS IL OREGON OR
INDIANA IN PENNSYLVANIA PA

A-2 Revision A
February 28, 1997
 Appendix A Reference

State or Province Code

PANAMA PAN
PRINCE EDWARD IS PE
QUEBEC PQ
PUERTO RICO PRI
RHODE ISLAND RI
RUSSIA RUS
SOUTH CAROLINA SC
SOUTH DAKOTA SD
EL SALVADOR SLV
SASKATCHEWAN SK
MIQUELON IS SPM
CAICOS IS TCA
TURKS IS TCA
TENNESSEE TN
TOBAGO TTO
TEXAS TX
UNITED STATES USA
UTAH UT
VIRGINIA VA
ST VINCENT VCA
BRITISH VIRGIN IS VGB
VIRGIN IS VIR
VERMONT VT
WASHINGTON WA
WISCONSIN WI
WEST VIRGINIA WV
WYOMING WY
YUKON TERRITORY YK

Revision A A-3
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

A.2 Country Codes

The following codes are used to identify Countries in the Jeppesen
International NavData database.

Country Code Country Code

AFGANISTAN AFG ALGERIA DZA

ANGOLA AGO ECUADOR ECU
ALBANIA ALB EGYPT EGY
UNTD ARAB EMIRATES ARE CANARY IS ESP
ARGENTINA ARG MELILLA ESP
ARMENIA ARM SPAIN ESP
AMERICAN SAMOA ASM ESTONIA EST
ANTARCTICA AUS ETHIOPIA ETH
AUSTRALIA AUS FINLAND FIN
AUSTRIA AUT FIJI IS FJI
AZERBAIJAN AZE FALKLAND IS FLK
BURUNDI BDI FRANCE FRA
BELGIUM BEL FAERO IS FRO
BENIN BEN CAROLINE IS FSM
BURKINA FASO BFA MICRONESIA FSM
BANGLADESH BGD PALAU FSM
BULGARIA BGR GABON GAB
BAHRAIN BHR UNITED KINGDOM GBR
BELORUSSIA BLR GEORGIA GEO
BOLIVIA BOL GHANA GHA
BRAZIL BRA GIBRALTAR GIB
BRUNEI BRN GUINEA REP GIN
BHUTAN BTN GAMBIA GMB
BOTSWANA BWA GUINEA-BISSAU GNB
CENTRAL AFRICAN REP CAF EQUTORIAL GUINEA GNQ
SWITZERLAND CHE GREECE GRC
CHILE CHL GREENLAND GRL
CHINA, PR OF CHN FRENCH GUIANA GUF
IVORY COAST CIV GUAM GUM
CAMEROON CMR MARIANA IS GUM
CONGO COG HAWAII HI
COOK IS COK HONG KONG HKG
COLOMBIA COL CROATIA HRV
COMOROS COM HUNGARY HUN
CAPE VERDE CPV INDONESIA IDN
CYPRUS CYP INDIA IND
CZECH CZE CHAGOS ARCH IOT
GERMANY DEU IRELAND IRL
DJIBOUTI DJI IRAN IRN
DENMARK DNK IRAQ IRQ
FAROE IS DNK ICELAND ISL

A-4 Revision A
February 28, 1997
 Appendix A Reference

Country Codes

Country Code Country Code

ISRAEL ISR NAURU NRU

ITALY ITA NEW ZEALAND NZL
JORDAN JOR OMAN OMN
JAPAN JPN PAKISTAN PAK
JOHNSTON I JTN PERU PER
KAZAKHSTAN KAZ PHILLIPINES PHL
KENYA KEN PAPUA NEW GUINEA PNG
KYRGYZSTAN KGZ POLAND POL
KAMPUCHEA KHM KOREA, DPR OF PRK
KIRIBATI KIR PORTUGAL PRT
KOREA KOR PARAGUAY PRY
KUWAIT KWT FRENCH POLYNESIA PYF
LAOS LAO QATAR QAT
LEBANON LBN REUNION REU
LIBERIA LBR ROMANIA ROM
LIBYA, SPA JAMAH. LBY RUSSIA RUS
SRI LANKA LKA RWANDA RWA
LESOTHO LSO SAUDI ARABIA SAU
LITHUANIA LTU SUDAN SDN
LUXEMBOURG LUX SENEGAL SEN
LATVIA LVA SINGAPORE SGP
MOROCCO MAR ASCENSION SHN
MOLDOVA MDA ST HELENA SHN
MALDIVES MDV SOLOMON IS SLB
MARSHALL IS MHL SIERRA LEONE SLE
MIDWAY I MID SOMALIA SOM
MALI MLI SAO TOME & PRINCIPE STP
MALTA MLT SURINAME SUR
UNION OF MYANMAR MMR SLOVAKIA SVK
MONGOLIA MNG SLOVENIA SVN
MARIANA IS MNP SWAZILAND SWZ
MOZAMBIQUE MOZ SWEDEN SWE
MAURITANIA MRT SEYCHELLES SYC
MAURITIUS MUS SYRIA SYR
MALAWI MWI CHAD TCD
MALAYSIA MYS TOGO TGO
MAYOTTE MYT THAILAND THA
NEW CALEDONIA NCL TAJIKISTAN TJK
NIGER NER TURKMENISTAN TKM
NIGERIA NGA TONGA TON
NIUE NIU TUNISIA TUN
NETHERLANDS NLD TURKEY TUR
NORWAY NOR TUVALU TUV
NEPAL NPL TAIWAN TWN
TANZANIA TZA

Revision A A-5
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

Country Codes

Country Code

UGANDA UGA
UKRAINE UKR
URUGUAY URY
UNITED STATES USA
UZBEKISTAN UZB
VENEZUELA VEN
VIETNAM VNM
VANUATU VUT
FUTUNA IS WLF
WESTERN SAMOA WSM
ARMENIA XJA
KYRGYZSTAN XJI
AZERBAIJAN XJJ
KAZAKHSTAN XJK
MOLDOVA XJO
RUSSIA XJR
TAJIKISTAN XJT
WAKE I XJW
YEMEN ARAB REP YEM
YUGOSLAVIA YUG
BOPHUTHATSWANA ZAF
CISKEI ZAF
NAMIBIA ZAF
SOUTH AFRICAN REP ZAF
SOUTHWEST AFRICA ZAF
TRANSKEI ZAF
VENDA ZAF
ZAIRE ZAR
ZAMBIA ZMB
ZIMBABWE ZWE

A-6 Revision A
February 28, 1997
 Appendix A Reference

A.3 ARINC Maps

A.3.1 United States

Figure A-1: ARINC Map (United States)

Revision A A-7
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

A.3.2 Standard ARINC Geographic Coverages

Refer to Figure A-2 for the standard ARINC geographic coverages.

Figure A-2: Standard ARINC Geographic Coverages

A-8 Revision A
February 28, 1997
 Appendix A Reference

A.4 GPS Status Messages

GPS Status Messages include the following:

GPS: ANTENNA FAULT

The GPS antenna is not connected or is not operating
properly.

GPS: NO GPS TIME

Satellite signal levels are too low to receive.

GPS: NO SV AVAILABLE
No satellites are in view at this time.

GPS: NO USABLE SVs

Tracking at least one SV. Time is being obtained.

GPS: NOT AVAILABLE

GPS sensor has failed.

GPS: ONLY n USABLE SV

Tracking 1 or 2 SVs. Need 3 for position fix.

GPS: PDOP TOO HIGH

Tracking at least three SVs, but geometry is bad.

GPS: RECEIVER FAIL

The GPS receiver is not functioning correctly and requires
service.

GPS: USING n SV 2-D

Tracking 3 or more SVs. Computing a 2-D position.

GPS: USING 4 SV 3-D

Tracking 4 or more SVs. Computing a 3-D position.

Revision A A-9
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

A.5 Changing NavData Cards During Flight

The Domestic and International NavData cards have few overlapping
waypoints (except Hawaii). If your plans call for crossing NavData
card boundaries, we recommend making two separate flight plans,
one for each card. Fly the flight plan of the card currently being used.
Change cards when it becomes necessary. Then, activate the
second flight plan to continue on the next leg.

Perform the following steps to change the NavData card:

1. Remove the NavData card currently being used. The

current active FPL is cancelled. The current TO waypoint
is preserved.

2. Insert the desired NavData card.

3. Select a FPL for the inserted card.

A-10 Revision E
April 27, 1998
 Appendix A Reference

A.6 Local Geodetic Reference Datums

Datum Locality

Adindan Ethiopia, Mali, Senegal, Sudan

AFG Somalia
Ain El Abd 1970 Bahrain Is.
Alaska (NAD-27) Alaska
Alaska/Canada Alaska/Canada
NAD-27
Anna 1 Astro 1965 Cocos Is.
ARC-1950 mean Botswana, Lesotho, Malawi, Zaire
Swaziland, Zimbabwe
ARC-1960 mean Kenya, Tanzania
Ascension Island '58 Ascension Is.
Astro Beacon "E" Iwo Jima Is.
Astro B4 Sor. Atoll Tern Is.
Astro Pos 71/4 S. Helena Is.
Astronomic Stn. '52 Marcus Is.
Australian Geodetic 1952 Australia, Tasmania
Australian Geodetic 1984 Australia, Tasmania
Bahamas (NAD-27) Bahamas except San Salvador
Bellevue (IGN) Efate & Erromango Is.
Bermuda 1957 Bermuda Is.
Bogota Observatory Colombia
Bukit Rimpah Indonesia
Camp Area Astro Antarctica
Campo Inchauspe Argentina
Canada Mean (NAD27) Canada incl. Newfoundland
Canal Zone (NAD27) Panama Canal Zone
Canton Island 1966 Phoenix Is.
Cape South Africa
Cape Canaveral mean Florida & Bahama Is.
Carribean (NAD27) Barbados, Caicos Is., Cuba,
Dominican Rep.,
Grand Cayman, Jamaica,
Leeward Is., Turks Is.
Carthage Tunisia
Central America (NAD27) Belize, Costa Rica, El Salvador,
Guatemala
Chatham 1971 Chatham Is., NZ
Chua Astro Paraguay
Corrego Alegre Brazil
(Provisional)
Cuba (NAD27) Cuba

Revision A A-11
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

Cyprus Isle of Cyprus

Djakarat (Batavia) Sumatra Is.
DOS 1968 Gizo Is., Solomon Is.
Easter Island 1967 Easter Island
Egypt Egypt
European 1950 mean Austria, Denmark, Finland,
France, Germany, Gibralter,
Greece, Italy, Netherlands,
Norway, Portugal, Spain,
Switzerland
European 1950 Western Europe
European 1979 mean Austria, Finland, Nethrlands,
Norway, Spain, Sweden,
Switzerland
Finish Nautical Chart Finland
Gandajika Base Republic of Maldives
Geodetic Datum '49 New Zealand
Ghana Ghana
Ordnance Survey of England, Isle of Man, Scotland,
Great Britain '36 Shetland Isles, Wales
Greenland (NAD27) Greenland
Guam 1963 Guam Is.
Gunung Segara S.E. Borneo
Gunung Serindung 1962 S.W. Borneo
GUX 1 Astro Guadalcanal Is.
Herat North Afghanistan
Hjorsey 1955 Iceland
Hong Kong 1963 Hong Kong
Hu-Tzu-Shan Taiwan
Indian Bangladesh, India, Nepal
Iran Iran
Ireland 1965 Ireland
ISTS o73 Astro '69 Diego Garcia
Johnston Island '61 Johnston Is.
Kandawala Sri Lanka
Kerguelen Island Kerguelen Is.
Kertau '48 West Malaysia, Singapore
La Reunion Mascarene Is.
L.C. 5 Astro Cayman Brac Is.
Liberia 1964 Liberia
Luzon Philippines except Mindanao
Mahe 1971 Mahe Is., Seychelles
Massawa Eritrea
Merchich Morocco
Mexico (NAD27) Mexico

A-12 Revision A
February 28, 1997
 Appendix A Reference

Midway Astro '61 Midway Is.

Mindanao Mindanao Is.
Minna Nigeria
Montjong Lowe Celebes Is.
Nahrwan Saudia Arabia
Namibia Namibia
Naparima, BWI Trinidad, Tobago
North America 1927 mean CONUS
North America '83 Alaska, Canada,
Central America, CONUS,
Mexico
Observatorio 1966 Corvo, Santa Cruz, Flores Is.
Old Egyptian Egypt
Old Hawaiian mean Hwaiian Is.
Old Hawaiian, Maui Maui
Old Hawaiian, Oahu Oahu
Old Hawaiian, Kauai Kauai
Oman Oman
Pico De Las Nieves Canary Is.
Pitcairn Astro '67 Pitcairn Is.
Puerto Rico Puerto Rico, Virgin Is.
Quatar National Quatar
Qornoq S. Kalaallit Nunaat
Rome 1940 Sardinia
SAD-69/Brazil Brazil
Santa Braz Saint Miguel, Santa Maria Is.
Santo (DOS) Espiritu Santo Is., New Hebrides
Sapper Hill '43 East Falkland Is.
Schwarzeck Nambia
Sicily Sicily
Sierra Leone 1960 Sierra Leone
Provisional South Bolivia, Chile, Colombia,
Ecuador, Guyana, Peru,
Venezuela
South American Argentina, Bolivia
1969 mean Brazil, Chile, Colombia, Ecuador,
Guyana, Paraguay, Peru,
Venezuela, Trinidad, Tobago
South Asia Singapore
Provisional South South Chile
Chilean 1963
S.E. Asia (Indian) Bangladesh, India, Kampuchea,
Laos, Nepal, Thailand, Vietnam
Southeast Base Porto Santo, Maderia Is.
Southwest Base Azores

Revision A A-13
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

Tananarive Madagascar
Observatory '25
Thai/Viet (Indian) Thailand, Vietnam
Timalai 1948 Brunei, E. Malaysia
Tokyo mean Japan, Korea, Okinawa
Tristan Astro 1968 Tristan da Cunha
Unites Arab United Arab Emirates
Emirates (Nahrwan)
Viti Levu 1916 Viti Levu Is.
Voirol Algeria, Tunisia
Wake-Eniwetok '60 Marshall Is.
WGS-72 Former World
WGS-84 World
Yacare Uraguay
Zanderij Surnam

A-14 Revision A
February 28, 1997
 Appendix A Reference

NOTES

Revision A A-15
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

NOTES

A-16 Revision A
February 28, 1997
 Appendix B The GPS System

Appendix B
The GPS System:
How It Works
GPS (Global Positioning System) is a navigation system based
on a constellation of 24 satellites orbiting the earth at very high
altitude. This system was established and is maintained by the
U.S. Department of Defense. GPS can give three-dimensional
position measurements accurate to within 50 feet (15 m).
GPS is based on satellite ranging: calculating a position by
measuring the distance to several different satellites. If we
know that the distance from satellite A is 11,000 miles, then we
must be somewhere on an imaginary sphere centered on the
satellite and having a radius of 11,000 miles as shown in Figure
B-1. If, at the same time, the distance from satellite B is known
to be 12,000 miles, then we must be on the circle where the two
spheres intersect, as shown in Figure B-2.
If we also know that we are 13,000 miles from satellite C, our
position is further restricted to the two points in space where the
three spheres intersect, as shown in Figure B-3. One of these
points is usually impossible (for example, far out in space).
GPS receivers have various techniques for distinguishing the
correct point from the incorrect one. Theoretically, these three
measurements are all we need to determine the position of our
aircraft.
The basic idea behind measuring the distance to a satellite is
the “velocity times travel-time” equation we all learned in school:
Distance = Velocity x Time

Revision A B-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

11,000 miles
Figure B-1

Figure B-2

Two measurements put us

somewhere on this circle

Three measurements put

us at one of two points

Figure B-3

B-2 Revision A
February 28, 1997
 Appendix B The GPS System

The GPS system works by calculating how long a radio signal

from a satellite takes to reach us, and then calculating the
distance to the satellite based on that time. We know the
velocity of light (about 186,000 miles per second). So if we can
determine exactly when the GPS satellite started sending its
radio signal, and exactly when we received it, we can calculate
how long the signal took to reach us.
How can the GPS receiver determine exactly when the signal
left the satellite? The satellites and receivers are very precisely
synchronized to generate the same pattern of radio signals at
exactly the same time. This pattern, or code, is a complicated
string of pulses that appears to be random, but is in fact,
carefully determined. Since the code appears to be random, it
is often referred to as “pseudo-random code”.
When the GPS receiver receives a satellite code, it measures
the time that elapsed between when it generated that code and
when it received the same satellite code. Plugging this value
into the equation above will give us the distance from our
aircraft to the satellite.
Of course, the measurements must be very precise—down to a
nanosecond, or one billionth of a second. The satellites achieve
this accuracy by means of atomic clocks that are amazingly
precise. GPS receivers are equipped with very precise
electronic clocks—but not always precise enough. Fortunately,
trigonometry says that if three perfect measurements locate a
point in three-dimensional space, then four imperfect
measurements can eliminate any clock offset (as long as the
offset is consistent). So by making an extra satellite range
measurement, we can eliminate clock offset.
An example will help explain this. For simplicity (and to
eliminate the need for three-dimensional graphics), let’s use a
two-dimensional example, such as a ship at sea (where altitude
is already known). This means that, if our clocks were perfect,
we would need only two range measurements to locate
ourselves exactly on the surface of the earth. The third range
measurement will be our “extra” one.

Revision A B-3
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

Consider the example in Figure B-4. Suppose our receiver’s

clock is consistent, but is 1 second slow. And, let’s say that the
signal from satellite A takes 4 seconds to reach us, while the
signal from satellite B takes 6 seconds. So we really are where
the two solid lines intersect.
A
B

4 Seconds
6 Seconds

Figure B-4
But, our imperfect receiver would think the signal from satellite
A took 5 seconds to reach us, and that from satellite B, 7
seconds. So our receiver thinks we are where the two shaded
lines intersect—which could be miles from our actual location.
Now let’s add a third measurement to the calculation. The
signal from satellite C takes 8 seconds to reach us, and our
receiver thinks it’s 9. From Figure B-5 we can see that the
three solid lines intersect at our true location.
A
B

5 Seconds
(wrong time)

7 Seconds
(wrong time)

9 Seconds
C (wrong time)

Figure B-5

B-4 Revision A
February 28, 1997
 Appendix B The GPS System

But, if we add our one-second offset to the drawing, the three

shaded lines show three possibilities for our location—the
“pseudo ranges” caused by our slow clock.
The GPS receiver, upon receiving this series of points,
assumes that its clock is off. It applies algebra to compute
where the three points could possibly intersect, and gives this
intersection as our true location.
Since an aircraft GPS system operates in three dimensions, it
needs four measurements to cancel out any error. This means
that it can’t determine a truly accurate position unless it has four
satellites within range above the horizon. Until all 24 satellites
are in place, there may be times when fewer than four satellites
are available overhead. During these times, altitude from an
encoder or manual input can permit continued navigation at
reduced accuracy.
There are some other sources of minor errors in the GPS
system. Tiny variations can occur in the altitude, speed, and
position of a satellite. These changes are monitored by the
Department of Defense, and the corrections are sent back to
the satellite, where they are broadcast along with the pseudo
codes. Other variations can be caused by ionospheric and
atmospheric delays. Another possible source of error is
“Geometric Dilution of Precision,” which means that the
intersection point of two ranges is slightly less accurate when
the satellites are close together. In a typical case, the sum of
these errors would amount to no more than 100 feet (30m); in a
worst case, no more than 200 feet (70m).
For military purposes, the Department of Defense can also
introduce deliberate errors into the system using an operational
mode called “selective availability,” or S/A. The stated accuracy
with S/A on is as follows:
• Better than 100m, 95% of the time
• Better than 300m, 99% of the time
The other 1% is undetermined, the DOD can set the accuracy
reduction much higher!

Revision A B-5
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

A sophisticated form of GPS, differential GPS, allows precise

measurements down to a centimeter (1" = 2.54 cm). Such
ultra-precise measurements are based on at least fifteen
minutes of GPS data collection at a stationary location and very
precise knowledge of a reference point. This form of GPS is
used in surveying and is being tested as a precision landing
system.

B-6 Revision A
February 28, 1997
 Appendix B The GPS System

B.1 GPS Information Center

Precise Worldwide Position, Velocity, and Time

GPS enables land, sea, and airborne users to determine their

three-dimensional position, velocity, and time anywhere in the
world with unprecedented accuracy. Satellite-based GPS is the
most precise radio navigation system available today or in the
foreseeable future.
GPS consists of three segments: space, control, and user.
The space segment will ultimately contain 21 operational
satellites about 10,900 nautical miles above the earth. The
satellites complete an orbit cycle every 12 hours and provide
direct line-of-sight radio frequency signals to users worldwide.
A ground control network tracks the satellites, determines orbits
precisely, and transmits orbit definition data to each satellite.
Navigation and position fixing using GPS is accomplished by
passive trilateration. Users measure range to and compute the
position of four satellites and process the measurements to
determine three-dimensional position and time.
Although GPS was originally designed to enhance the war-
fighting capability of U.S. and allied military forces, the
unprecedented accuracies already available from the system
have given rise to a wide variety of civil GPS applications. As
the GPS reaches full maturity, applications are anticipated to
continue to emerge, and worldwide civil land, sea, and airborne
users are expected to out number military users by a sizeable
margin.

Revision A B-7
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

Civil GPS Information Center

In order to accommodate the needs of the large worldwide civil

GPS user community, the U.S. Government has established
GPS Information Center (GPSIC). Operated and maintained by
the United States Coast Guard for the Department of
Transportation, the primary functions of the GPSIC are to
provide information to and serve as the point of contact for civil
GPS users.

Information Available

Information available from the GPSIC is called the Operational

Advisory Broadcast, which contains the following general
categories of GPS performance data:

• Current constellation status (satellite health

data)
• Future status (planned outages of satellites)
• Almanac data (suitable for making GPS
coverage and satellite visibility predictions)

Information Media

GPS Operational Advisory Broadcast information is available

from the GPSIC in the following forms:

• Computer bulletin boards

• Voice tape recording
• Voice broadcasts
• Facsimile broadcast

B-8 Revision A
February 28, 1997
 Appendix B The GPS System

All GPSIC services are provided free of charge. Registration

for the GPSIC bulletin board is done on-line at the first
session.
COMMS PARAMETERS
• Asynchronous - 8 Data Bits
• 1 Start Bit, 1 Stop Bit
• No Parity
• Full Duplex
• XOn/XOff
• Both Bell and CCITT Protocols

The GPSIC computer bulletin board may be accessed by dialing

(703) 313-5910 for modem speeds of 300-14,400 bps.
The telephone number for the voice tape recording is (703) 313-
5907.

Information Requests

In additional to the prerecorded Operational Advisory Broadcast

information available, the GPSIC is prepared to respond to
individual user inquiries, comments, or concerns regarding civil
access to and use of the GPS. The GPSIC will accept calls of
this nature from civil users 24 hours a day. The number is (703)
313-5900.

Revision A B-9
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

Written comments, questions, or concerns on the GPS or

operation of the GPSIC may be addressed to:
Commanding Officer
U.S. Coast Guard ONSCEN
7323 Telegraph Road
Alexandria, Va 22310-3998
(703) 313-5400

Other Information Sources

GPS status information may also be obtained from the following

sources:
• WWV/WWVHHF radio broadcasts WWV minutes 14
& 15; WWVH minutes 43 & 44)
- (5, 10, 15, 20 MHz)
• Defense Mapping Agency (DMA) weekly Notices to
Mariners
• DMA broadcast warnings (NAVAREA,
HYDROLANT,and HYDROPAC)
• DMA NavInfoNet, ANMS
1200 BAUD - (301) 227-5295
2400 BAUD - (301) 227-4630
9600 BAUD - (301) 227-4424
• USCG Broadcast Notices to Mariners
• NAVTEX Data Broadcast
- (518 kHz)

B-10 Revision B
May 12, 1997
 Appendix B The GPS System

Users must register off-line before accessing the National

Imagery and Mapping Agency NavInfoNet. A user ID and
information booklet is available by writing the DMA Hydrographic/
Topographic Center (ATTN: MCN/NAV-INFONET) Bethesda, MD
20816-5003 or calling (301) 227-3296.

GPS Information Center Users' Manual

Detailed information on the GPSIC services and how the

services may be obtained is available in a GPS Information
Center Users’ Manual. The Users’ Manual may be obtained by
calling (703) 313-5900 or writing the Information Center.
NOTE

Satellite visibility window predictions are not

offered by the GPSIC. This information is
available from commercial sources or from
commercially available software.

Civil GPS Service Steering Committee

In addition to the services provided by the GPSIC, the U.S.

Government has established a Civil GPS Service Steering
Committee (CGSSC). The purpose of the CGSSC is to
address issues and problems that relate to the civil use of the
GPS and to provide a forum for discussions between civil GPS
users and the DOD.
The CGSSC consists of an Executive Council, General
Committee, and five Subcommittees:
• Precise Positioning and Surveying
• Timing
• Reference Station
• International
• Carrier Phase Tracking

Revision B B-11
May 12, 1997
TRIMBLE 2101 I/O Approach Plus

The CGSSC is jointly chaired by the U.S. Department of

Transportation and the U.S. Coast Guard. Points of contact
are:

U.S. Department of Transportation

Research and Special Programs Administration
400 7th Street, S.W., Room 9402
Washington, DC 20590-0001
Phone: (202) 366-4333
Fax: (202) 366-3666

Commandant (G-NRN)
U.S. Coast Guard
2100 Second Street, S.W.
Washington, DC 20593-0001
Phone: (202) 267-0283
Fax: (202) 267-4427

The CGSSC meets about every three months, and the

General Committee meetings are open to all interested
parties.

B-12 Revision B
May 12, 1997
 Appendix C The User Setup Mode

Appendix C
The User Setup Mode
The User Setup mode allows you to configure the Navigator to
your preferred settings. From the User Setup mode, you can
modify the following features:

Database Search Regions

AIRWATCHTM
Save/Load Configuration
Once the settings have been chosen, the User Setup mode can
be disabled, providing protection for the preferred settings.
(Enable is the factory default.) To disable/enable the User Setup
mode:

• Press to access Configure mode.

• Turn the to display the Display Diagnostic page.

• While the display test is running, press the key
sequence , , .

• Press .
• Select DISABLE or ENABLE as desired, using the
.

• Press .
When disabled, the User Setup screen and functions are unavail-
able.

Revision B C-1
May 12, 1997
TRIMBLE 2101 I/O Appoach Plus

C.1 Database Search Regions

You may select specific states and regions for a database
search. These search parameters can include up to 6 regions,
states, provinces or countries. “ALL” is the factory default
setting for this page.

You can also restrict a database search by specifying the

following regions in the United States:

nw North West
sw South West
nc North Central
sc South Central
ec East Central
ne North East
se South East

These U.S. Regions correspond to the ARINC regions. Their

boundaries are different from those used in government publica-
tions. Refer to Appendix A for regional maps, and a list of state,
province and country codes.

The display below indicates that database searches will be made

for the individual countries of France, Germany and Italy.

SEARCHêREGIONS:êFRA
DEUêITA

The display below indicates that database searches will be made

for the northeast region, California, Nevada, Arizona, Utah, and
Colorado.
SEARCHêREGIONS:êsw
CAêêNVêêAZêêUTêêCO

C-2 Revision A
February 28, 1997
 Appendix C The User Setup Mode

To establish Database Search Regions:

• Press to access the User Setup mode.

• Rotate the knob to display the Search Regions

page.
• Press .

• Rotate the knob to move through the editable

fields.
• Rotate the knob to select the desired region,
state, province, or country code.
• Continue this process to enter up to 6 search
parameters.
• Press to complete the selection.

Defining a search region will not restrict searches in the

NRST mode, or restrict searches for restricted airspaces.

Revision B C-3
May 12, 1997
TRIMBLE 2101 I/O Appoach Plus

C.2 AIRWATCH™ - The Airspace Alert System

The Airspace Alert page allows you to enable or disable specific
Special Use airspaces from the AIRWATCH™ search feature.
The factory default AIRWATCH™ setting is OFF.

The Navigator monitors aircraft position in relation to the bound-

aries of Special Use airspaces in the United States and provides
a warning of impending airspace penetration. AIRWATCH™
does not take into consideration hours of operation or vertical
boundaries associated with controlled airspaces.

The display below indicates that AIRWATCH™ is ON and ALL

airspaces are being monitored. If individual airspaces have been
enabled or disabled, the word “SELECTED” will appear instead of
“ON” in this display.
AIRWATCH:êêêêêêêêON
ALLêAIRSPACES

To turn AIRWATCH™ ON/OFF or to designate SELECTED

airspaces:
• Press to access the Configure mode.

• Rotate the knob to access the AIRWATCH™

page.

• Press .

• Rotate the knob to select ON, OFF or SE-

LECTED.

• Press .

• If SELECTED is chosen, rotate the knob to

display optional airspaces.

• Press and rotate the knob to enable or

disable each SELECTED airspace.

• Press to confirm each selection.

• Rotate the to display the next airspace.

C-4 Revision A
February 28, 1997
 Appendix C The User Setup Mode

C.3 Saving and Loading the Configuration

Navigator configuration can be saved to or loaded from a Memory
Card (also called the RAM Card) or an IBM PC. The Memory
Card is a data storage device that fits in the slot on the front of
the Navigator normally used by the Jeppesen NavData Database
Card.

Data on the Memory Card can be updated with an IBM PC, or

the PC may be interfaced directly to the Navigator, when used in
conjunction with the optional Trimble Flight Planning and Configu-
ration software known as NavPak. When the PC is interfaced
directly to the Navigator, appropriate cabling must be provided
between the Navigator rear connector and the PC (typically a
standard 9-pin connector is installed in the aircraft to accommo-
date interface to the PC).

The RAM card and NavPak are sold separately. Contact your
Trimble dealer for details.

WARNING

Do not load or save configuration data during flight while navigat-

ing. Data should be loaded or saved during pre-flight or post-
flight.

Revision A C-5
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

C.3.1 Saving Configuration to the Memory Card

To save the current Navigator configuration to the Memory Card:

• With the Navigator off, remove the NavData card and

insert the RAM card.
• Turn the Navigator on.

• Press to access the User Setup mode.

• Rotate the knob display the “Save/Load Config”

page.

• Rotate the knob to select “SAVE CONFIGURA-

TION VIA RAM CARD (ENT)”.

• Press .
The Navigator will display the status of the Memory Card and ask
for confirmation to write to the card.

• Press to begin data transfer to the Memory

Card.
During the data transfer, the display will indicate the amount of
data transferred by showing the percentage of transfer in the
upper right-hand corner. When the transfer is complete, the
display will show 100%.

During the SAVE process, the Navigator can detect some

problems with the Memory Card. If an error occurs, the user can
exit the SAVE process by pressing any of the Navigator Keys.

To return the Navigator to normal operation:

• Turn the Navigator off.

• Replace the RAM Card with the NavData Card.
• Turn the Navigator on.

C-6 Revision E
April 27, 1998
 Appendix C The User Setup Mode

C.3.2 Loading Configuration from the Memory Card

To load the Navigator configuration from the Memory Card:

• With the Navigator OFF, remove the NavData card

and insert the RAM card.
• Turn the Navigator on.

• Press to access the User Setup mode.

• Rotate the knob until the “SAVE/LOAD CONFIG,

TURN OUTER KNOB” message is displayed.

• Rotate the knob to select “LOAD CONFIGURA-

TION VIA RAM CARD (ENT)”.

• Press .
The Navigator displays “CLEAR BEFORE LOAD?”. There are
two options:

• Press to clear the existing configuration and

load the new one.
OR

• Rotate the knob to display “APPEND CARD

DATA”.

• Press to add the configuration from the Memory

Card to the existing Navigator configuration.
During the data transfer, the display will indicate the amount of
data transferred by showing the percentage of transfer in the
upper right-hand corner. When the transfer is completed, the
display will show 100%. It is not possible to stop the data
transfer once it is started.

Revision E C-7
April 27, 1998
TRIMBLE 2101 I/O Appoach Plus

If an error is detected before the transfer begins, the transfer will

not start. In this case, an advisory message appears and the
MSG indicator on the Navigator starts to flash. The advisory
message directs you to make the necessary corrections.

During the LOAD process, if a record error is detected, an

advisory message is displayed on the bottom line. If an error is
found in a record, that record is not transferred to the Navigator,
but the load operation continues.

During a LOAD process for which you have selected the AP-
PEND option, the data being loaded is automatically checked for
compatibility with the existing data. If an incompatibility is found
in a record, that record is not transferred to the Navigator, but the
load operation continues.

LOADêCONFIGêê17
INVALIDêID:êUDLATU

A load error is displayed as follows:

The invalid ID is located on line 17 of the NavPak file.

LOADêCONFIGê48
MAXêERRORS:êABORTING

If more than 10 errors or incompatibilities are detected, the data

transfer is aborted. The error message below is displayed:

When any errors are reported, the Navigator contains a partial

(and probably corrupted) data set. The configuration process
should be repeated.

C-8 Revision A
February 28, 1997
 Appendix C The User Setup Mode

C.3.3 Saving Configuration via Serial Port

To save the current Navigator configuration onto an IBM PC:

• Connect the Navigator to the PC using the cable

prepared by your installer.

• Press to access the User Setup mode.

• Rotate the knob until the “SAVE/LOAD CONFIG,

TURN OUTER KNOB” message is displayed.

• Rotate the knob to select “SAVE CONFIGURA-

TION VIA SERIAL PORT (ENT)”.

• Press .
• Prepare the PC to receive Navigator configuration data
and write it to file.
During the data transfer, the display will indicate the amount of
data transferred by showing the percentage of transfer in the
upper right-hand corner. When the transfer is completed, the
display will show 100%.

During the SAVE process, the Navigator can detect some

processing problems. If an error occurs, the user can exit the
SAVE process by pressing any of the Navigator keys.

To ensure proper Navigator operation, turn the Navigator off and

then back on after the Save operation.

Revision E C-9
April 27, 1998
TRIMBLE 2101 I/O Appoach Plus

C.3.4 Loading Configuration via Serial Port

To load the Navigator configuration from an IBM PC:

• Connect the Navigator to the PC using the cable

prepared by your installer.

• Press to access the User Setup mode.

• Rotate the knob until the “SAVE/LOAD CONFIG,

TURN OUTER KNOB” message is displayed.

• Rotate the knob to select “LOAD CONFIGURA-

LOADêCONFIGURATION
CLEARêBEFOREêLOADê?

TION VIA SERIAL PORT (ENT)”.

• Press .

• Press to clear the existing configuration and

load the new one.
OR

• Rotate the knob to display “APPEND DATA FILE”.

• Press to add the configuration from the IBM PC

compatible to the existing Navigator configuration.
• Prepare the PC to send the data file to the Navigator.

C-10 Revision E
April 27, 1998
 Appendix C The User Setup Mode

During the data transfer, the display will indicate the amount of
data transferred by showing the percentage of transfer in the
upper right-hand corner. When the transfer is completed, the
display will show 100%. The data transfer can only be stopped
by turning off the Navigator.

If an error is detected before the transfer begins, the transfer will

not start. An advisory message appears and the MSG annuncia-
tor starts to flash. The advisory message directs the user to
make the necessary corrections.

During the LOAD process, if a record error is detected, an

advisory message is displayed on the bottom line. If an error is
found in a record, that record is not transferred to the Navigator,
but the load operation continues.

During a LOAD process for which the user has selected the
APPEND option, the data being loaded is automatically checked
for compatibility with the existing data. If errors are detected, the
MSG annunciator begins to flash. The number of the bad record
and the number of the character within the record are displayed
on the second line. If an incompatibility is found in a record, that
record is not transferred to the Navigator, but the load operation
continues.

A load error is displayed as follows:

LOADêCONFIGê17
LOADêCONFIGê17
I
INVALIDêID:êUDLATU
NVALIDêID:êUDLATU

The invalid ID is located on line 17 of the NavPak file.

Revision A C-11
February 28, 1997
TRIMBLE 2101 I/O Appoach Plus

If more than 10 errors or incompatibilities are detected, the data

transfer is aborted. The following error message is displayed:

LOADêCONFIGê48
MAXêERRORS:êABORTING

When any errors are reported, the Navigator contains a partial

(and probably corrupted) data set. The configuration process
should be repeated.

To ensure proper Navigator operation, turn the Navigator off and

then back on after the Load operation.

C-12 Revision A
February 28, 1997
 Glossary

Glossary of Terms
absolute altitude
Actual altitude above the surface of the earth.

auto fix
The ability of a GPS receiver to start position calculations without
being given an approximate location and approximate time.

AUX (auxiliary mode)

AUX mode contains the functions not used directly for navigation, but
as a supplementary to navigation functions.

barometric altitude
Altitude above the surface of the earth as measured by barometric
pressure; a relative measure of altitude.

bandwidth
The range of consecutive frequencies comprising a signal.

C/A code
The standard (Clear/Acquisition) GPS code: a sequence of 1023
pseudo-random, binary, biphase modulations on the GPS carrier at a
chip rate of 1.023 MHz. Also known as the “civilian code.”

carrier-aided tracking
A signal processing strategy that uses the GPS carrier signal to aid
the code loop tracking.

carrier frequency
The frequency of the unmodulated fundamental output of a radio
transmitter.

CDI
Course Deviation Indicator; a visual display of distance offset from the
desired course.

Revision A G-1
February 28, 1997
TRIMBLE 2101 I/O Approach Plus

channel
A channel of a GPS receiver, consisting of the circuitry necessary to
track the signal from a single GPS satellite.

clock bias
The difference between the clock’s indicated time and true universal
time.

continuous receiver
A GPS receiver which has from five to twelve channels used in
environments that are highly dynamic or require high accuracy.

control segment
A worldwide network of GPS monitoring and control stations that
ensure the accuracy of satellite positions and their clocks.

cross-track error
A measure of the distance of an aircraft from its desired track; usually
in nautical miles.

data message
A 1500-bit message included in the GPS signal that reports the
satellite’s location, clock corrections, and condition. Included is
rough information on the other satellites in the constellation.

datum
A mathematical model (ellipsoid or spheroid) which best represents
all or one area of the Earth's surface.

desired track
The desired track between current position and the selected destina-
tion. Aircraft HSI's OBS (OMNI bearing selector) or HDG bug should
be set to match the desired track.

DGPS
Differential Global Positioning System

differential positioning
Precise measurement of the relative positions of two receivers
tracking the same GPS signals.

G-2 Revision E
April 27, 1998
 Glossary

Dilution of Precision
The multiplicative factor that modifies range error. It is caused solely
by the geometry between the user and the set of satellites used.
Known as DOP, GDOP or PDOP.

Doppler-aided
A signal processing strategy that uses a measured Doppler shift to
help the receiver smoothly track the GPS signal. Allows more
precise velocity and position measurement.

Doppler shift
The apparent change in the frequency of a signal caused by the
relative motion of the transmitter and receiver. Doppler shift mea-
surements provide extremely accurate velocity measurements.

ephemeris data
Predictions of current satellite positions that are transmitted to the
user in the data message.

field
A part of the Navigator’s LED display that contains one discrete piece
of information; for example, one letter of an identifier, or the bearing
to a waypoint.

frequency band
A particular range of frequencies.

frequency spectrum
The distribution of signal amplitudes as a function of frequency.

function keys
The Navigator’s -D> (DIRECT), ENT, and MSG keys.

geometric dilution of precision

See Dilution of Precision.

GNSSU
Global Navigation System Sensor Unit

Revision E G-3
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

GPS
Global Positioning System; a satellite-based navigation system.

great circle
The shortest distance between two points on the earth’s surface.

ICAO
International Civil Aviation Organization; assigns identifiers
to waypoints throughout the world. The Trimble Navigation System
uses these identifiers for international waypoints; it uses FAA
identifiers for waypoints in the continental U.S.

identifier
The FAA code or ICAO code that identifies an Airport, VOR, NDB, or
Intersection.

ING
Irish National Grid

intersection
The crossing of two VOR radials or victor airways.

ionosphere
The band of charged particles 80-120 miles above the earth’s
surface.

ionospheric refraction
The change in the propagation speed of a signal as it passes
through the ionosphere.

L-band
The group of radio frequencies extending from 390 MHz to 1550 MHz.
The GPS carrier frequencies (1227.6 MHz and 1575.42 MHz) are in
the L-band and/or UHF frequency band.

LAT/LON
Latitude/Longitude

LED
Light Emitting Diode, used in the Navigator's display.

G-4 Revision E
April 27, 1998
 Glossary

LSEA
Lowest Safe Enroute Altitude.

MEA
Minimum Enroute Altitude.

MESA
Minimum Enroute Safe Altitude to destination waypoint, allowing
1000 feet of clearance over the highest terrain.

MGRS
Military Grid Reference System

mode keys
The NAV, WPT, FPL, CALC, AUX, and NRST keys on the Navigator,
which determine the mode in which it is operating.

MSA
Minimum Safe Altitude calculated for present position, allowing 1000
feet over highest terrain and obstacles in current geographic sector.

multi-channel receiver
A GPS receiver that can simultaneously track more than one satellite
signal.

multiplexing channel
A channel of a GPS receiver that can quickly sequence through a
number of satellite signals.

NDB
Non-Directional Beacon.

OSGB
Ordnance Survey of Great Britain

P-code
The Precise or Protected code. A very long sequence of pseudo-
random binary biphase modulations on the GPS carrier at a chip rate
of 10.23 MHz, which repeats about every 267 days. Each one-week
segment of this code is unique to one GPS satellite and is reset
each week.

Revision E G-5
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

PDOP
See Dilution of Precision (DOP).

pseudo-random code
A signal with random-noise-like properties. It is a very complicated,
repeating pattern of 1s and 0s.

pseudo-range
A distance measurement based on the correlation of a satellite-
transmitted code and the local receiver’s reference code, not
corrected for errors in synchronization between the transmitter’s
clock and the receiver’s clock.

RAIM
RAIM Receiver Autonomous Integrity Monitoring.

satellite constellation
The arrangement in space of a set of satellites. The GPS constella-
tion consists of 24 satellites in 6 orbital planes.

scroll
To move (characters) to the left across the LED display in order to
show more information.

sequencing receiver
A receiver of less than four channels that collects GPS data by
switching from one satellite to the next in sequence.

space segment
The part of the whole GPS system that is in space (i.e., the satel-
lites).

spread spectrum
A system in which the transmitted signal is spread over a frequency
band much wider than the minimum bandwidth needed to transmit
the information. This is done by modulating with a pseudo-random
code (for GPS).

SIDs
Standard Instrument Departures

G-6 Revision E
April 27, 1998
 Glossary

STARs
Standard Terminal Arrivals

static positioning
Location determination when the receiver’s antenna is
presumed to be stationary on the earth. This allows the use of
various averaging techniques that improve accuracy by factors of over
1000.

TK
Track, the actual magnetic course.

true altitude
Altitude above mean sea level.

UPS
Universal Polar Stereographic.

user interface
The way a receiver conveys information to the person using it; the
controls and displays.

user segment
The part of the whole GPS system that includes the receivers of GPS
signals.

UTC
Coordinated Universal Time.

UTM
Universal Transverse Mercator

VDL
VHF Data Link

VHF
Very High Frequency

Revision E G-7
April 27, 1998
TRIMBLE 2101 I/O Approach Plus

VNAV
Vertical Navigation; the ability to establish a vertical descent profile.
The Navigator provides for a VNAV calculation and provides vertical
guidance information to the pilot.

VOR
Very High-Frequency Omnidirectional Range transmitter used for
aircraft navigation.

G-8 Revision E
April 27, 1998
 Index

Index
A indicated 7­9
manual 8­14
Abbreviations minimum safe 1­4
approach 3­3 pressure
waypoint type 4­2, 4­3, 5­4 7­1, 7­9, 7­10, 7­12, 8­14
Active Flight Plan. See Flight calculations 7­10
Plan: active source 8­12, 8­13, 8­14
ADD NEW FLIGHT PLAN 5­3 BARO/GPS-2D 8­13
Air and Fuel Data Computer I- BARO/GPS-3D 8­13
6, 7­12 encoder 8­14
Air Data GPS-3D 8­13
calculations 7­1, 7­9. See HELD/GPS-2D 8­13
also CALC key: modes: Air MANUAL/GPS-2D 8­13
Data none 8­14
pages 7­9 OLD 8­13
altitude 7­9 PRS/GPS-2D 8­13
pressure altitude 7­9 PRS/GPS-3D 8­13
TAS 7­9 Annunciators 1­2, 1­8, 1­12
wind 7­9 APR 1­13, 3­4
Airport 1­3, 4­2 HLD 1­13
database information 1­3 MSG 1­12, 9­2
departure 1­4, 5­1, 5­11 PTK 1­13, 8­26
destination 3­4, 3­5, 5­11 WPT 1­12
identifier 1­3, 1­4, 3­5 Antenna
Airspace Alert C-4. See also GPS 8­16
AIRWATCH Approaches
Airspeed 7­1 1­3, 3­1, 4­2, 4­11, 4­13,
AIRWATCH C-4 4­21, 5­1
Almanac Data 3­17 activate 3­5, 4­20
Altitude I-5, 7­9, 8­12 active 3­6
density 7­1, 7­10, 7­11 join 3­6
calculations 7­10 add to flight plan 3­4
display 8­12 airport identifiers 1­3
entering 8­14 annunciator 3­4. See also
GPS 8­14 Annunciators: APR
Revision E
April 27, 1998 Ind-1
TRIMBLE 2101 I/O Approach Plus
availability 8­25 APR
barometric setting 3­4 annunciator 1­13. See also
update 3­8 Annunciators: APR
course reversal ARINC
3­8, 3­9, 3­10, 3­11, 3­15 maps A-7, A-8
destination airport 3­5 Auto Cancel 8­26
DGPS 3­1, 3­21 AUX Key 1­8, 8­1
direct-to DGPS Tuning 8­1
FAF 4­21
first waypoint 4­20, 4­21 B
direct-to first waypoint 4­21 BARO/GPS-2D 8­13
disable 3­8 BARO/GPS-3D 8­13
DME arc 3­2, 3­11 Barometric Pressure 7­9, 8­12
bearing and distance 3­13
bottom line displays 3­13 C
top line displays 3­13
enable 3­4, 3­7, 3­15 CALC key 1­8. See also Keys:
status 3­7 CALC
FAF-MAP leg 3­3 modes 7­1
final Air Data 7­1
intercept 4­22 displays 7­2
join 3­6 entering data 7­2
final approach fix 3­2 Flight Plan/Fuel 7­1, 7­2
GPS 3­1, 3­3, 3­15 Save Present Position 7­1
summary 3­15 Calculator Key. See CALC key
join 3­3, 3­6, 4­20 Cancel Flight Plan. See Flight
missed 3­14 Plan
names 1­3 CDI 8­26, 9­6
non-precision 3­15 scaling 1­12
overlay 3­3 Change Flight Path. See Flight
procedures Path
defined by 4­11 Checklists 8­1, 8­2, 8­3
RAIM creating 8­3
3­17, 3­18, 3­19, 3­20, 8­18 deleting 8­9
availability 8­25 deleting items 8­7, 8­8
rules 3­3 editing 8­6
select 3­4 inserting items 8­7
transition 3­5 mode 8­3
waypoint 4­1 naming 8­3
waypoints 1­3, 3­2, 3­13 number 8­4
abbreviations 3­3 using 8­5
identifiers 3­2 Codes
names 3­2
Revision E
Ind-2 April 27, 1998
 Index
country D
list A-4, A-5, A-6
province Data Entry 2­3
list A-2 Data Pages
state 1­8, 1­10, 1­11, 2­1, 2­3
list A-2 flight plan 5­2
Configuration fuel management 7­4
data transfer C-11 primary 1­10
error C-11 secondary 1­10, 1­11
loading C-7 Database I-3, I-
error C-11 4, 1­3, 1­5, 4­2
memory card C-7 card slot 1­2, 1­6
using IBM PC C-10 changing database cards A-
via serial port C-10 10
saving C-6 expiration 8­16
memory card C-6 NavData card 4­2
using IBM PC C-9 search regions C-2, C-3
via serial port C-9 ARINC regions C-2
Configure 8­1, 8­2, 8­26 U.S. regions C-2
database search regions C-2 Database Expiration Information
dead reckoning 8­26, 8­28 8­10
display diagnostic 8­30 DATABASE EXPIRED 1­6
I/O interface check 8­27 DATABASE MISSING 1­6
parallel offset 8­26, 8­27 Database Search Regions
save/load C-5 ARINC regions A-7, A-8
Controlled Airspace. See international regions A-8
AIRWATCH maps A-7, A-8
Country Codes U.S. regions A-7
list A-4, A-5, A-6 Dead Reckoning
Course Deviation 3­13 8­24, 8­26, 8­28
Course Deviation Indicator. See demo mode 8­28
CDI ground speed 8­29
Course Reversal starting point 8­28
3­9, 3­10, 3­15 track 8­29
holding pattern 3­10 Demo Mode 8­28
procedure turn 3­9 Departure Airport. See Airport:
teardrop 3­11 departure
Cross Track Error 8­26 Desired Track 3­13
Crosswind. See Wind: cross- Destination Airport. See Airport:
wind destination
Crystal Offset 8­15 DGPS 3­1
Current Track 7­14 Approaches 3­21

Revision E
April 27, 1998 Ind-3
TRIMBLE 2101 I/O Approach Plus
Tuning 8­1, 8­2, 8­30 add procedure 5­5
airport 8­30 add SID 5­4
channel 8­30 add STAR 5­4
final approach segment approach
8­30 add 5­10, 5­11
runway 8­30 calculations 7­1
Differential Global Positioning cancel 2­4, 5­15, 5­16
System. See DGPS create 5­3, 5­4, 5­6
Direct-to 4­20 data pages 5­2
waypoint 2­4 direct-to 5­3
Direct-to Key 1­9, 1­10, 2­4 edit 5­4, 5­9
Display Diagnostic 8­30 enter 2­6
Distance 7­3, 7­5 erase 5­16
DME arc legs 5­2
3­2, 3­3, 3­11, 3­12. See active 5­2, 5­13
also Approaches direct-to 5­15
DR. See Dead Reckoning join 5­3, 5­14
review 5­13
E stored 5­2, 5­3, 5­13
ENT key 1­10, 2­2 modes 5­2
Enter Key. See ENT key procedures 5­4
Entering Information 1­11 add 5­8, 5­10, 5­11
Estimated Accuracy 8­18, 8­20 delete 5­12
Estimated Time Enroute (ETE) replace 5­12
7­2, 7­3 reverse 5­14
Estimated Time of Arrival (ETA) SID
3­18, 7­2 add 5­9, 5­10, 5­11
delete 5­9
F edit 5­9, 5­12
STAR
FAF. See Final Approach Fix add 5­9, 5­10, 5­11
Final Approach Fix delete 5­9
1­13, 3­2, 3­3, 4­21. See edit 5­9, 5­12
also Approaches stored 5­1, 5­2
Final Course stored legs 5­1
intercept 4­22 suspend 5­18
Flight Path 2­4 waypoints 5­4
change 2­4, 2­5 add 5­6, 5­9, 5­10
Flight Plan delete 5­9, 5­10
activate 2­4, 5­3, 5­14 replace 5­9, 5­10
active 5­1, 5­2 Flight Plan Distance (DIST) 7­2
active legs 5­1
add approach 3­4, 5­4
Revision E
Ind-4 April 27, 1998
 Index
Flight Plan Key. See FPL Key 3D 8­19
Flight Plan/Fuel Pages 7­2 3D/BARO 8­19
Flight Time Reserve 7­6 3D/PRS 8­19
FPL Key 1­8, 5­1 status messages A-9
modes 5­1, 5­2 GPS-3D 8­13
Fuel 1­7, 2­2 Ground Speed
at arrival 7­6 7­2, 7­3, 7­4, 7­14
calculations
7­1, 7­4, 7­5, 7­7 H
consumption 7­4 Heading 7­13, 7­14
efficiency 7­4 Headwind. See Wind: headwind
estimated 7­4 HELD/GPS-2D 8­13
flow 7­8 HLD
management 7­2, 7­4 annunciator 1­13
on board 1­7 Hold 5­18
remaining 7­4, 7­5, 7­6, 7­8 annunciator. See Annuncia-
reserve 7­6, 7­7 tors: HLD
used 7­8 flight plan waypoint 5­18
Function Keys 1­8 missed approach 5­19
G outside flight plan 5­18
Holding Pattern 5­18. See also
GPS Hold
altitude 8­14 course reversal 3­10
annuciator. See Annuncia-
tors: GPS I
antenna 8­16 I/O Interface Check 8­27
messages A-9 Indicated Airspeed 7­12
GPS: RECEIVER FAIL A-9 Initial Approach Fix (IF) 3­3
satellite Initialization 1­7
disable 8­22 Install 8­2
enable 8­22 Install and Test Setup 8­27
satellite availability Installation Manual I-4
8­18, 8­21, 8­24 Intercept Course 4­22
satellite status Intermediate Fix 3­3
8­18, 8­21, 8­22 International
sensor reset 8­18, 8­23 Database I-4, I-5, 1­3. See
status 8­18 also Jeppesen Navigation
2D+ BARO 8­19 Database
2D+HELD 8­19 search regions A-1
2D+MANL 8­19 Intersection 4­1
2D+PRS 8­19 Intersections 1­4, 4­3, 4­7

Revision E
April 27, 1998 Ind-5
TRIMBLE 2101 I/O Approach Plus

J MAHP. See Missed Approach

Holding Point
Jeppesen Navigation Database MANUAL/GPS-2D 8­13
I-3, I-4, I-5, 1­3, 1­5, 4­2 Maps
card slot 1­2 ARINC A-7, A-8
changing database cards A- Memory Battery 8­15
10 Memory Card C-5
country codes A-4, A-6 Message Annunciator 1­12
expiration 1­6 Message Key. See MSG key
information I-5, 1­3, 1­5 Messages 9­1
North American I-4, 1­3, 4­2 accessing 9­2
province codes A-2 advisory 9­2
state codes A-2 GPS messages A-9
subscription I-3, 1­6 GPS: NO SV AVAILABLE
Join leg 4­15, 4­20 A-9
priority 9­2
K RAIM error 9­4, 9­6
Keys 1­8, 1­10, 2­1 system 9­2, 9­4
AUX 1­8, 8­1, 8­2 explanation 9­4
CALC 1­8, 7­1 Miles Per Gallon 7­4
Direct-to 1­9, 2­4 Minimum Safe Altitude 1­4
ENT 1­10, 2­2 Missed Approach
FPL 1­8 3­2, 3­3, 3­14, 3­15
MSG 1­9, 9­1 before the MAP 3­14
NAV 1­8, 6­1, 6­11 beyond the MAP 3­14
NRST 5­17 procedure 3­4
WPT 1­8, 4­1, 4­4, 4­13 select 3­14
Knobs 1­8. See also Selector Missed Approach Holding Point
Knobs 1­5, 3­2, 3­3, 3­14, 3­15
Modes 1­8, 1­10, 2­1
L approach 3­5, 4­11
checklist 8­1, 8­3
LED display 1­2, 1­7 configure 8­1, 8­26
automatic dimming 1­7 FLT PLAN/FUEL
brightness level 1­7 7­2, 7­3, 7­4
M NAV 6­1, 6­2. See also
NAV mode
Mach Number 7­12 restore 2­5
Magnetic Variation 7­14 SID 4­11
STAR 4­11
system status 8­10
User 4­17

Revision E
Ind-6 April 27, 1998
 Index
waypoint 4­1 Outside Air Temperature (OAT)
MSG Annunciator. See Annun- 7­10, 7­12
ciators: MSG
MSG key 1­9, 9­1 P

N Parallel Offset 8­26, 8­27

auto cancel 8­26
NAV key 1­8, 6­1 no cancel 8­26
NAV mode 6­2 selecting 8­26, 8­27
display 6­3 Parallel Track
pages 6­2 annunciator. See Annuncia-
bottom line display tors: PTK
6­2, 6­3 PDOP. See Position Dilution of
top line display 6­2, 6­3 Precision (PDOP)
primary page 6­2 Phonetic Waypoints 7­16. See
NavData card 1­3, 1­6, 3­3 also Waypoint: phonetic
Navigation Key. See NAV key Position Dilution of Precision
Navigation Page (PDOP) 8­18, 8­20
primary 2­4 Power Switch 1­2, 1­7, 2­2
Navigator 2­1 Power-Up 2­2
NavPak C-5 Present Position
NDB 1­4, 4­1, 4­2, 4­7 display 8­12
Nearest 5­17 saving 7­16
agencies 5­17 Present Position/Altitude 8­10
waypoints 5­17 Pressure Altitude 7­1, 8­14
waypoints, user 5­17 Procedure 2­1, 2­3, 4­16. See
Nearest Key 1­9, 5­17 also Approaches; Standard
NO ACTIVE FLIGHT PLAN 5­2 Instrument
No Cancel 8­26 Departure; Standard
NO STORED FLIGHT PLANS Terminal Arrival
5­2 activating 4­14
add 5­9
O defining 4­13
OAT. See Outside Air Tempera- delete 5­9, 5­12
ture (OAT) edit SID 5­9
OAT "K" Factor 7­12 edit STAR 5­12
Operation Overview 1­8, 1­10 entering 5­4
annunciators 1­8. See also insert 5­10
Annunciators join leg 4­15, 4­20
keys 1­8. See also Keys name 4­13
selector knobs 1­8. See replace 5­12
also Selector Knobs Procedure Turn 3­8, 3­9
Outside Air Temperature 7­12 Province Codes
Revision E
April 27, 1998 Ind-7
TRIMBLE 2101 I/O Approach Plus
list A-2 S
PRS/GPS-2D 8­13
PRS/GPS-3D 8­13 Satellite. See GPS: satellite
PTK availability 8­18
annunciator 1­13. See also coverage 3­18
Annunciators: PTK status 8­18
Save Present Position
Q 7­1, 7­16
Save/Load Configuration C-5
Quick Reference Card I-4 Selector Knobs
R 1­2, 1­8, 1­9, 2­1, 2­3
large 1­9, 1­11
RAIM small 1­9, 1­11
3­17, 8­12, 8­18, 8­19, 9­4, 9­6 Self-Diagnostic Test 1­7, 2­2
annunciator. See Annuncia- Sensor Status 8­2, 8­18
tors: RAIM approach RAIM availability
approach 8­18, 8­25
3­17, 3­18, 3­19, 3­20 estimated accuracy
APR 8­20 8­18, 8­20
availability GPS satellite availablity
3­18, 3­19, 8­18, 8­25 8­18, 8­21, 8­24
definition 3­17 GPS satellite status
enroute 3­17 8­18, 8­21, 8­22
limit 3­18 disable satellite 8­22
prediction enable satellite 8­22
3­17, 3­18, 3­20, 8­25 GPS sensor reset
status 8­19 8­18, 8­23
NO RAIM 8­19 GPS status 8­18
RAIM/B 8­19 Service Information I-4
TERM 8­20 SID. See Standard Instrument
terminal 3­17 Departure
Ram Air Temperature (RAT) Software Code Display 8­10
7­10, 7­12 Software Revision Information
RAM Card C-5 8­10, 8­17
Range 7­5 Speed 7­2, 7­3, 7­4
RAT. See Ram Air Temperature Standard Instrument Departure
Rate of Fuel Consumption 7­2 1­4, 4­2, 4­11, 4­13, 4­15,
Receiver Autonomous Integrity 4­16, 5­1
Monitor. See RAIM activating 4­15
Reverse Flight Plan. See Flight add 5­5
Plan: reverse defined by 4­12
Runway 1­3 delete 5­5
direction 7­15
Revision E
Ind-8 April 27, 1998
 Index
edit 5­12 select 4­14
Standard Terminal Arrival True Airspeed
1­4, 4­1, 4­2, 4­11, 4­13, 4­15, 7­1, 7­9, 7­11, 7­12, 7­13, 7­14
4­16, 5­1 calculations 7­12
activating 4­15
add 5­5 U
defined by 4­12 User Setup 8­30
delete 5­5 database search regions C-4
STAR. See Standard Terminal enable/disable C-1
Arrival save/load configuration C-5
State Codes User Waypoints
list A-2 4­1, 4­3, 4­16. See also
Stored Flight Plans. See Flight Waypoints: user
Plan: stored bearing and distance 4­16
Suspend waypoint sequencing creating 4­16, 4­17, 4­18
5­18 editing 4­19
SV. See GPS: erasing 4­19
satellite; Satellite latitude and longitude 4­16
System Code Display 8­17 present position 4­16
System Status 8­2, 8­10 UTC Time 8­10
database revision information
8­10, 8­16 V
present position/altitude
8­10, 8­12 VDL
software code display Messages 9­13
8­10, 8­17 VDL Tuning 8­33
software expiration informa- Vertical Navigation Display 6­6
tion 8­10, 8­17 Vertical Navigation Profiles
time display 8­10 7­17. See also VNAV
voltage and temperature VNAV 7­17
display 8­10, 8­15 VNAV Profiles 6­6, 7­18
creating 7­18
T using 6­6
Voltage and Temperature
TAS. See True Airspeed Display 8­10, 8­15
Teardrop Course Reversals 3­11 VOR 1­4, 4­2
Temperature 8­10
Time display 8­10 W
Time, distance, speed calcula-
tions 7­1, 7­2, 7­3 Warranty Information I-3
Time Zones 8­11 Waypoint 2­1, 4­1
Transition

Revision E
April 27, 1998 Ind-9
TRIMBLE 2101 I/O Approach Plus

abbreviations 5­4 by city name 4­9

activating 4­14 by identifier 4­9
active 4­14 by waypoint name 4­10
add 4­17, 5­6 sequencing
advisory 6­4 hold 5­18
airport 4­1, 4­2, 4­4 SID 4­1, 4­2, 4­5, 4­15
selecting 4­8 STAR 4­2, 4­6, 4­15
annunciator. See Annuncia- STARs 4­1
tors: WPT user 4­1, 4­3, 4­7, 4­16
approches editing 4­19
1­3, 4­1, 4­2, 4­5 selecting 4­8
bearing to 4­3 VOR 4­1, 4­2, 4­6
categories 4­2 selecting 4­8
delete 5­10 Waypoint key. See WPT key
direct to Wind
4­14, 4­15, 4­16, 4­21 aloft
displays 4­4 calculations 7­13, 7­14
approaches 4­5 calculations 7­1, 7­9, 7­15
intersection 4­7 crosswind 7­1, 7­15
SID 4­5 direction 7­13, 7­15
STAR 4­6 headwind 7­1, 7­15
user 4­7, 4­16 speed 7­13, 7­15
VOR 4­6 WPT
distance to 4­3 Annunciator 1­12
editing 4­19 WPT key 1­8, 4­1
enroute 5­1
entering 5­4 Z
hold 5­18 Zulu Time 8­10
identifiers 3­2, 4­10
abbreviations 4­2, 4­3
scan 4­10
information 4­2, 4­10, 6­11
intersections 4­1, 4­3, 4­7
selecting 4­8
NDB 4­1, 4­2
selecting 4­8
phonetic 7­16
copy 7­16
radial from 4­3
replace 5­10
selecting 4­8

Revision E
Ind-10 April 27, 1998
T
2105 Donley Drive
Austin, Texas 78758
(512) 432-0400