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9 DIGITAL SELECTIVE CALLING (DSC)
9.1
GENERAL
This GX2000/GX2150 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 commu-
nication 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 approximately 20 nautical miles.
A DSC Warning sticker is included with
the GX2000/GX2150. To comply with
FCC regulations this sticker must be
mounted in a location that can be easily
viewed from the location of the GX2000/
GX2150.
Digital Selective Calling (DSC) 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 system allows mariners to instantly send a distress call with GPS posi-
tion (when connected to the transceiver) to the Coast Guard and other
vessels within range of the transmission. DSC will also allow mariners to
initiate or receive Distress, Urgency, Safety, Routine, Position Request,
and Position Report, Automatic Position Polling, and Group calls to or from
another vessel equipped with a DSC transceiver.
9.2
MARITIME MOBILE SERVICE IDENTITY (MMSI)
9.2.1 What is an MMSI?
An MMSI is a nine digit number used on marine transceivers capable of using
Digital Selective Calling (DSC). This number is used like a telephone number
to selectively call other vessels.
GX2000/GX2150
WARNING
NOTE
WARNING
STICKER
Page 47
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