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GX1280S Page 31
7 DIGITAL SELECTIVE CALLING
7.1 GENERAL
WARNING
This radio is designed to generate a digital maritime distress and safety
call to facilitate search and rescue. To be effective as a safety device,
this equipment must be used only within communication range of a shore-
based VHF marine channel 70 distress and safety watch system. The
range of signal may vary but under normal conditions should be ap-
proximately 20 nautical miles.
Digital Selective Calling is a semi-automated method of establishing a radio
call, it has been designated by the International Maritime Organization (IMO)
as an international standard for establishing VHF, MF and HF radio calls. It
has also been designated as part of the Global Maritime Distress and Safety
System (GMDSS). It is planned that DSC will eventually replace aural watches
on distress frequencies and will be used to announce routine and urgent
maritime safety information broadcasts.
This new system allows mariners to instantly send a distress call with GPS
position (when connected to the transceiver) to the US Coast Guard and
other vessels within range of the transmission. DSC will also allow mariners
to initiate or receive Distress, Urgency, Safety, Routine, POSITION RE-
QUEST, POSITION SEND, and Group calls to or from another vessel
equipped with a DSC transceiver.
7.2 DSC SCAN
When the radio is shipped from the factory it is programmed so CH70 (the
DSC channel) is scanned at all times. A selection is provided in the SETUP
MENU to disable the DSC SCAN. Turning off DSC SCAN will disable the
radio from receiving DSC calls (i.e.: Distress Call, Individual Call, All Ships
Call, and Position Requests). If you want to use any of the functions the
selection must be left ON.
To Change DSC SCAN Method:
1. Press and hold down the
[
CALL/SET
]
key until
“RADIO SETUP” menu appears.
2. Turn the CHANNEL selector knob to select “DSC
SETUP” menu.
3. Press the
[
CALL/SET
]
key, then select “DSC
31


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