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page 19 Owners Manual GX1270S
6 DIGITAL SELECTIVE CALLING
6.1 GENERAL
6.1.1 Digital Selective Calling (DSC)
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 had 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 will allow 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, POS
Request, POS Send and Group calls to or from another vessel equipped
with a DSC transceiver.
6.1.2 Maritime Mobile Service Identity (MMSI)
What is an MMSI?
An MMSI is a nine digit number used on Marine Transceiver capable of
using Digital Selective Calling (DSC). This number is used like a telephone
number to selectively call other vessels. Refer to section 7.7 (USER MMSI
INPUT).
How can I obtain a MMSI assignment?
Contact your dealer or Standard Horizon for details.
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 approximately 20 nautical miles.
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