About Digital Selective Calling
6
About Digital Selective Calling
The U.S. Coast Guard and other rescue authorities offer radiotelephone service to
mariners as part of the Global Maritime Distress and Safety System. This service,
known as Digital Selective Calling (DSC), lets mariners instantly send automatically
formatted distress alerts to rescue authorities anywhere in the world. Digital selective
calling also lets mariners initiate or receive distress, urgency, safety and routine
radiotelephone calls to or from any similarly equipped vessel or shore station, without
requiring either party to be near a radio loudspeaker. DSC acts like the dial and bell of
a telephone, allowing you to “direct dial” and “ring” other radios, or allow others to
“ring” you, without having to listen to a speaker.
Your radio's DSC Call feature lets you transmit and receive DSC Calls based on ITU-R
M.493-11. You can send a distress message in an emergency situation, send and
receive position data to and from other vessels, and set up and use a directory of
other vessels with DSC radios.
You can also use the radio's NMEA input and output feature to display and use vessel
information. DSC calls your radio can send and receive include distress, individual,
individual ack, ALL SHIPS, group, position request, position reply, and position send.
DSC calls your radio can receive include distress ack, geographic, distress relay, and
distress relay ack.
About Digital Selective Calling
UM525 Paper OM.fm Page 6 Tuesday, January 4, 2005 2:54 PM
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