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D Logs summary
MiLLennium Command Descriptions Manual 141
GGAB Global Position System Fix Data (Binary Format Only)
Time, position and fix-related data of the GPS receiver. This binary log is a replica of the NMEA GPGGA ASCII log
expressed in binary format with NovAtel header added.
Format: Message ID = 27 Message byte count = 80
Note:
➀ The maximum age reported here is limited to 99 seconds.
Field # Data Bytes Format Units Offset
1 Sync 3 char 0
(header) Checksum 1 char 3
Message ID 4 integer 4
Message byte count 4 integer 8
2 UTC time of position 8 double hhmmss.ss 12
3 Latitude (DDmm.mm)
(+ is North, - is South)
8 double degrees 20
4 Longitude (DDDmm.mm)
(+ is East, - is West)
8 double degrees 28
5 Fix status
0 = fix not available or invalid
1 = GPS fix
2 = Differential GPS fix
4 integer 36
6 Number of satellites in use. May be different to the number in view 4 integer 40
7 Horizontal dilution of precision 8 double 44
8 Antenna altitude above/below mean-sea-level (geoid) 8 double metres 52
9 Geoidal separation (see Figure C-6) 8 double metres 60
10
Age of Differential GPS data ➀
8 double seconds 68
11 Differential reference station ID, 0000-1023 4 integer 76