RT_GPS_Status Firmware version and GPS status information
RT_GPS_Status: 140, 0 (0x8C0020 + unit id) (0x300)
----
Byte 0: GPS status
Byte 1: Firmware version major
Byte 2: Firmware version intermediate
Byte 3: Firmware version minor
Byte 4: Number of satellites used
Byte 5: Number of satellites used by GPS2 (RTK units only)
Byte 6: Number of common satellites (RTK units only)
Byte 7: RTK status (RTK units only)
----
GPS status codes:
0: GPS module not detected
1: Insufficient satellites
2: Solution failed
3: Solution OK
4: Solution aborted
5: Unused
6: Searching for satellites
7: Exceeded maximum speed or altitude
RTK status codes:
0: Not attempting RTK solution
1: Insufficient common satellites
2: RTK solution failed
3: RTK solution OK