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Using Digital Selective Calling (DSC) Features
CHANNEL UP button CHANNEL DOWN button
Capital letters (A through Z) One blank space
Lower-case letters (a through z) Numbers (0 through 9)
Punctuation (/ ‘ + -) Punctuation (/ ‘ + -)
Numbers (0 through 9) Lower-case letters (a through z)
One blank space Capital letters (A through Z)
Making DSC Calls
There are essentially four different types of DSC voice calls:
Call type What it does When to use it
Distress Alerts all stations that you need
assistance and sends them your
current position.
In an emergency only.
Individual Calls a single station using the
User MMSI.
Any time you want to talk to
another station.
Group Calls all the stations that have the
same Group MMSI as yours.
Any time you want to talk with
the whole group you are traveling
with at the same time.
All ships Calls all stations in range of your
radio.
Safety warnings (e.g., debris
in the water) or an urgency
situation.
All ships call
Group
call
Individual
call
All ships call
For examples of how you might use different call types, see the diagram
below:
(dotted circles)
(dotted circles)
UM425 VHF OM.indd 29 28/9/11 11:55:17 AM