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3.
DIGITAL SELECTIVE CALLING
3.1
General
Digital Selective Calling (hereafter abbreviated as DSC) is a semi-automated method
of establishing a radio call. DSC has been designated by the International Maritime
Organization (IMO) as an international standard for establishing VHF, MF and HF ra-
dio calls. It has also been designated as a part of the Global Maritime Distress and
Safety System (GMDSS). DSC replaces aural watches on distress frequencies and
announces routine and urgent maritime safety information broadcasts.
This system allows mariners to instantly transmit a distress call with GPS position to
the Coast Guard and other vessels within range of the transmission. DSC also allows
mariners to initiate or receive distress, urgency, safety, routine, position request, po-
sition transmit and group calls to or from another vessel equipped with a DSC trans-
ceiver.
3.2
Maritime Mobile Service Identity (MMSI)
3.2.1
What is an MMSI?
An MMSI is a nine-digit number used on marine transceivers capable of using DSC.
This number is used like a telephone number to selectively call other vessels.
Note: This vessel's MMSI must be entered into the radio to use the DSC functions.
3.2.2
How to enter your MMSI number
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NOTICE
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 the signal may
vary, but under normal conditions it should be
approximately 20 nautical miles.
NOTICE
An MMSI can be entered only once. There-
fore, be careful not to enter the wrong MMSI
number. If you need to change the MMSI
number after it has been entered, return the
radio to the factory.
3-1
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