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VHF 300 Series Owner’s Manual 19
Digital Selective Calling
Selecting the Channel for Individual Calls or Group Calls
When placing an individual or group call, you can select from the following channels on
which you want to communicate. The radio transmits this request with your call.
USA: 6, 8 ,9 ,10 ,13 ,16, 17, 67, 68, 69, 71, 72, 73, or 77
Canadian and International: All of the channels listed previously, plus Channel 15
In most cases, the selection of a DSC channel is limited to those channels that are available
in all frequency bands. When selecting the channel, select CUSTOM to select a different
channel than the ones listed above. If you select a custom channel, be aware that the station
you are calling may not be able to comply with the specied channel. Ensure that you select
a channel that is appropriate for communication.
Placing All-Ships Calls
All-ships calls are transmitted to all stations within receiving distance of your radio. You can
make two types of all-ships calls:
Safety calls are used to broadcast signicant navigational or weather-related information.
Urgency calls are used to communicate situations about the safety of a vessel or person
when danger is not imminent. Discerning whether a situation warrants a distress call or
an urgency call is the responsibility of the captain.
To place an all-ships call:
1. Press the DSC key.
2. Select ALL SHIPS.
3. Select SAFETY or URGENCY to indicate the reason for your call.
4. Select CALL. The radio transmits the call on Channel 70 and then automatically
switches to Channel 16.
Placing Position Request Calls
Position data received from stations that respond to position request calls is sent over the
NMEA network, so that you can track the vessels on your Garmin chartplotter, for example.
For more information on NMEA 0183 and NMEA 2000, see page 29.
1. Press the DSC key.
2. Select POS. REQUEST.
3. Select from the following options to select the place from which the MMSI number is
retrieved:
MANUAL—a screen is displayed that gives you the ability to enter the MMSI number
manually. Select a number and move to the next character. When you have entered
the correct MMSI number, select ACCEPT.
DIRECTORY—the directory is displayed. Select an entry.
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