Operation Manual

OM-E 2072-09287-00
3-57
3-12.4 Using ALE Mode to Send and Request GPS Position Data
You can use the ALE AMD service to:
1. Send your position to any another destination (including one-to-many).
2. Request the position of another Micom transceiver equipped with a GPS receiver. You can
make this type of request only when you call an individual station.
Note that the operations described above automatically set up a link between the two stations and
therefore it is necessary to disconnect the link when it is no longer needed. For this purpose, it is
recommended to enable Home Acknowledge, and/or enable the PTT time-out function.
NOTE
AMD messages with the GPS position do not enter the stack (the
information such message carries is good only at the time you got it):
if you do not read the message in time, you can no longer retrieve the
message at a later time.
Thus, you must allow sufficient time for the destination station to read
the position message before when link is disconnected. This is
particularly important when Home Acknowledge is enabled: the
message will disappear as soon as you disconnect the link.
3-12.4.1 Request GPS Position
To automatically get the position of another Micom station, use the following procedure:
1. Select the CALL mode (either from the ALE mode or the CHAN mode).
2. Select the destination address (you can make only an individual call).
3. Select the PAGE selection mode.
4. Scroll until you see the RMT POS message, and then send the message.
5. Your station starts the link set up to the selected station; after the link is set up, you will see the
response AMD of the called station, which includes its latitude and longitude. POSITION
INVALID means that the remote station cannot provide its location.
6. You may now continue with voice communication, or disconnect the link to the called station.
NOTE
Radio sets of various vendors can also accept GPS position requests.
The position request is made by sending the string FIXPOSIT as an
AMD message.
3-12.4.2 Sending Own GPS Position
You can use the PAGE service to send the AMD message that appears in position 14 in the default list
of AMD messages to transmit your own position to a remote station.
To send your position report to other station(s):
1. Select the CALL mode (either from the ALE mode or the CHAN mode).
2. Select the destination address and/or the call type.
3. Select the PAGE selection mode.
4. Scroll until you see the I AM AT … message, and then send the message.
5. Your station sends the AMD message with your latitude and longitude.