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VHF 300 Series Owner’s Manual 21
Digital Selective Calling
Receiving Position Request Calls
You can congure your radio reply automatically to incoming position requests, to prompt
you to review and approve the incoming requests before replying, or to ignore incoming
requests (see page 27 for more information).
If you enable automatic position replies, the screen displays “SENDING POSITION
CALLING” and sends your position when receiving a position request. After the call has
been transmitted successfully, the screen displays “POSITION SENT”.
When receiving a position request, “POS. REQUEST FROM [VESSEL NAME or MMSI
NUMBER]” is displayed on the screen. If GPS data is available, press OK to send the
position reply. If GPS data is not available, the screen displays “NO GPS DATA. UNABLE
TO COMPLY”.
Receiving Position Send Calls
When receiving a position send call (position report), “POS. SEND FROM [VESSEL
NAME or MMSI NUMBER]” is displayed on the screen with the position data. Select OK
to return to the Home screen.
Receiving Group Calls
1. When receiving a group call, “GROUP ROUTINE” is displayed on the screen. The radio
prompts you to change to the requested channel. If the channel request is for an invalid
channel, “INVALID CH REQUEST” is displayed on the screen.
2. Select OK to change the working channel.
3. Select OK to return to the Home screen on the new channel.
Position Tracking
When you enable position tracking, your radio uses interval position-request calls to track
up to three vessels. Regulations allow transmission of one position-request call every ve
minutes. You can call up to three vessels that your radio will alternate calling at ve-minute
intervals. If a vessel does not respond to ve consecutive position-request calls, the vessel is
removed from the position-tracking list.
The following timetable shows the polling sequence when you have three vessels in the
position-tracking list. The radio continues to send position-request calls until you stop
position tracking by selecting EXIT.
Time 0 minutes 5 minutes 10 minutes 15 minutes 20 minutes
Vessel Polled Ship 1 Ship 2 Ship 3 Ship 1 Ship 2