Furuno FS-1570 - Manual (Page 95)

5. CALLING, RECEIVING
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5.8 Position Call
There are two types of position calls: other station requires your ship’s position and your
ship requests position of another ship.
Finding position of other station
Other Station
Own Station
(2) Position request call
(1) Position Information
Sending own ship's position to other stations
Own Ship
(2)
Position Information
(1)
Requests ship's position