User's Manual Part 1

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Advanced Selective Call Functions
Requesting Another Station’s GPS Position
select the channel you want to send the GPS request call on.
(“Beacon Call” can be used to select the best channel)
listen for traffic on that channel, if no traffic is heard then press the
key
select “GPS Request” with the scroll keys
then press the key
enter the identification of the station you want to request the GPS
position from (see Entering station IDs and using the address
and telephone books”)
then press the key