Filter
Top Products
FM-4000Page 34
11 DIGITAL SELECTIVE CALLING
11.1 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 CH70 distress and safety watch system. The range
of the signal may vary but under normal conditions should be approxi-
mately 20 nautical miles.
NOTE
A DSC warning sticker is included with
the FM-4000. To comply with FCC regu-
lations, this sticker must be mounted in
a location that can be easily viewed from
the location of the FM-4000.
Digital Selective Calling 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 radio calls. It has
also been designated as a 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 mari-
time safety information broadcasts.
This new system allows mariners to instantly send a Distress call with GPS posi-
tion (when connected to the transceiver) to the US Coast Guard and other ves-
sels within range of the transmission. DSC will also allow mariners to initiate or
receive Distress, Urgency, Safety, Routine, Position Request, Position Send, and
Group calls to or from another vessel equipped with a DSC transceiver.
11.2 MARITIME MOBILE SERVICE IDENTITY
(
MMSI
)
11.2.1 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 ves-
sels.
DIST RESS
PULL OPEN
-/*
JKL
WARNING
STICKER