Humminbird VHF255SW Marine Radio User Manual


 
49
To request the Lat/Lon position of an MMSI (POS r
equest):
This option allows you to request GPS position information from any vessel for which an
MMSI number is known.
1. From the DSC Call Type List, select POS REQUEST, then select either LAST RX
or CONTACTS.
2a. If you selected LAST RX, pressing the CH/ENTER knob will allow you to send
the call. Skip to step 3.
or...
2b. If you selected CONTACTS, the Contact List will be displayed. Select a contact
for which you want position information. Rotate the CH/ENTER knob to select
the MMSI number of the person from the Contact List for which you want
position information, then press the CH/ENTER knob again to initiate the
request.
3. The radio switches to CH 70 and the TX icon is displayed while the position
request is being sent, then the awaiting acknowledgment message will be
displayed.
4a. If the call is acknowledged, the position data is displayed, and an alert will sound.
or...
4b. If the call is not acknowledged within 16 seconds, the radio will prompt you to
resend the call.
5. If you do nothing for 5 minutes, the position request will be cancelled and the
radio will revert to Normal mode.
Position Reply: The position reply can be used to send your position to another radio
when your radio has an operating GPS receiver connected. The position reply feature
can either prompt you to send your position manually or do it automatically, depending
on your DSC Setup configuration.
DISTRESS
23’20.1234 N
100’15.1002 E
08:10PM UTC