AT$GPSP?
$GPSP: 0
when module is down there no acquired position
AT$GPSACP
$GPSACP:
OK
AT$GPSP=1
OK
Until first fix is received the command will display initial GPS position
AT$GPSACP
$GPSACP: ,,,,,1,,,,,,
OK
Once fix has been received the command will display actual GPS position
AT$GPSACP
$GPSACP: 3206.4020N,03450.2678E,1.1,3.3,0,0.0,0.0,0.0,030613,06,03
OK