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Digital Selective Calling (DSC)
Digital Selective Calling has been chosen by the International Maritime
Organization (IMO) as an international standard for establishing VHF, MF
and HF radio calls. Digital Selective Calling has also been selected as part
of the Global Maritime Distress and Safety System (GMDSS). This service
will let you instantly send a Distress call with GPS position to the US Coast
Guard and other vessels within range of the transmission.
DSC will also let you initiate or receive distress, urgency, safety, position
information and routine calls to or from another vessel outfitted with a
DSC transceiver. See the information in the Setup Section (page 35) for
instructions on how to setup the directory of names.
Note: The effective range for data communications may be less than
the effective range for voice communications.
To make a DSC Call, press [CALL/LIGHT]. That takes you to the
DSC
Menu
. From there you can select several different Calls you can make:
Individual Call, Group Call, All Ships Call, Position Request, Position
Send, Standby, and Call Wait. They are described in the paragraphs
below.
Note: Although Directory names can be up to 12 characters long.
Individual Call
1. Select an open (unused) working Channel.
2. Press [CALL/LIGHT].
3. At the
DSC Menu, use S and T to select Individual.
Press [ENTER].
4. At the
Individual screen, use S and T to select the
individual from the Directory.
Note: You must have entries in your directory to make an Individual
Call. See the Setup Section (page 35.)
5. Press [ENTER]. You will see the
Attention screen. Use W or X
to select
Yes and press [ENTER] to make the call. Or, select No
and press [ENTER] to cancel the call.
Note: If you select No, you’ll be returned to the
Individual
screen.
6. When you receive the individual acknowledgment successfully,
both radios tune to the previously selected Channel. You are now
Advanced VHF Radio Operations
Mystic OM.book Page 90 Wednesday, October 22, 2003 8:59 PM