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Safety Communication

The document outlines the procedure for transmitting DSC safety messages on MF, HF, and VHF channels, which involves an initial announcement followed by the safety message transmission. The safety call is made on designated distress calling channels, and the urgency message format is specified, including the repetition of key phrases and identification of the transmitting ship. Examples illustrate how to convey navigation warnings effectively using the DSC system.

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George Kandelaki
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26 views1 page

Safety Communication

The document outlines the procedure for transmitting DSC safety messages on MF, HF, and VHF channels, which involves an initial announcement followed by the safety message transmission. The safety call is made on designated distress calling channels, and the urgency message format is specified, including the repetition of key phrases and identification of the transmitting ship. Examples illustrate how to convey navigation warnings effectively using the DSC system.

Uploaded by

George Kandelaki
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Safety -DSC communications on MF, HF and VHF

▶ Transmission of DSC Safety message

Transmission of safety messages shall be carried out in two steps.


 announcement of the safety message
 transmission of the safety message
The announcement is carried out by transmission of a DSC safety call on the DSC distress
calling channel (4,6,8,12,16mHz on HF, 2187.5kHz on MF, Channel 70 on VHF)
The safety message is transmitted on the distress and safety traffic channel in the same band
in which the DSC call was sent, ie. 2182.0kHz on MF, Channel 16 on VHF

The DSC safety call may be addressed to all ship(VHF only), ships in a specific geographical area
(MF/HF only), or to a specific station.
The frequency on which the safety message will be transmitted shall be included in the DSC urgency call

The transmission of an urgency message is thus carried out as follows;


 tune the transmitter to the DSC distress calling channel(2187.5kHz on MF, Channel 70 on VHF)
 select the appropriate calling format on the DSC equipment(all ships(VHF only), geographic area(MF/HF
only) or individual);
 transmit DSC safety call
 transmit the safety message as follows;
- "SECURITE", repeated 3times
- "ALL STATIONS" or called station, repeated 3times
- "this is"
- the 9-digit identity and the call sign or other identification of own ship
- the text of the urgency message
eg.:
=PUSAN PORT AUTHORITY= by VHF Channel 16 (In case Navigation warning)
SECURITE, SECURITE, SECURITE, ALL STATIONS, ALL STATIONS, ALL STATIONS
THIS IS BUSAN PORT AUTHORITY, BUSAN PORT AUTHORITY, NAVIGATION WARNING,
CHANGE TO CHANNEL 13(ONE THREE) AND STANBY.

= PUSAN PORT AUTHORITY= by VHF Channel 13


ALL STATIONS, ALL STATIONS, ALL STATIONS, THIS IS BUSAN PORT AUTHORITY, BUSAN
PORT
AUTHORITY, NAVIGATION WARNING.
LEFT SIDE OF ENTRANCE BUOY IS OBSTRUCTED BY A SUNKEN VESSEL. A RED BUOY IS
FASTENED TO THE OBSTRUCTION. ALL SHIPS NAVIGATE WITH GREAT CARE.
BUSAN PORT AUTHORITY. OUT

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