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.
When 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 within
range of your radio.
Safety warnings (e.g.,
debris in the water) or any
urgent situation.
Making DSC Calls
There are essentially four different types of DSC voice calls:
Using DSC Features
Suppose you are
coordinating safety for a
sailboat race. Before the
race starts, you instruct all
the racers to enter your
group MMSI number into
their radios. During the race:
•
Throughout the race,
you use group calling to
update the racers on the
time, race status, and any
course corrections.
•
A power boat full of
spectators comes too
close to the race path.
You use individual calling
to contact the power boat
and advise them to stay
clear of the race.
•
You see a rowboat
entering the area, but since it doesn’t have a radio, you can’t
communicate with the rowboat. You use all ships calling to alert all the
other boats in the area of the possible danger.
All ships call
Group
call
Individual
call
All ships call
36
Handheld VHF Marine Transceiver
UNIDEN MHS245
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