Digital Selective Calling; General; Maritime Mobile Service Identity; What Is An Mmsi - Furuno FM-4800 Operator's Manual

4. DIGITAL SELECTIVE CALLING

4.1 General

Digital Selective Calling (DSC) is a semi-automated method to establish 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).
DSC replaces listening watches on distress frequencies and is used to broadcast
routine and urgent maritime safety information broadcasts.
This system allows mariners to instantly transmit a distress call with GNSS position
to the Coast Guard and other vessels within the range of the transmission. DSC also
allows mariners to initiate or receive distress, urgency, safety, routine, position
request, position transmit, and group calls to or from another vessel equipped with a
DSC radio.

4.2 Maritime Mobile Service Identity

4.2.1

What Is an MMSI?

An MMSI is a nine-digit number used on marine radios capable of using DSC. This
number is used like a telephone number to selectively call other vessels.
Note
To use the DSC functions, this vessel's MMSI must be entered into the radio.
4.2.2

How to Enter Your MMSI Number

Caution
An MMSI can be entered only once. Therefore, be careful not to enter the wrong
MMSI number. If you need to change the MMSI number after it has been entered,
contact your dealer.
Press the Menu/DSC control until the "MAIN MENU" appears.
Step 1
Go to "DSC SETUP > SET MMSI".
Step 2
Enter you MMSI number (nine digits).
Step 3
If you enter a wrong digit, press the BACK key until the wrong digit is
selected, and then enter the correct digit.
After you enter the MMSI number, press the Menu/DSC control to save
Step 4
the number.
Enter the MMSI number again, and then press the Menu/DSC control to
Step 5
save the number.
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