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: The maximum age reported here is limited to 99 seconds.

Field # Data Bytes Format Units Offset
1Sync 3 char 0
(header) Checksum 1 char 3
Message ID 4 integer 4
Message byte count 4 integer 8
2UTC time of position 8 double hhmmss.ss 12
3Latitude (DDmm.mm)
(+ is North, - is South) 8 double degrees 20
4Longitude (DDDmm.mm)
(+ is East, - is West) 8double degrees 28
5Fix status
0 = fix not available or invalid
1 = GPS fix
2 = Differential GPS fix
4integer 36
6Number of satellites in use. May be different to the number in view 4 integer 40
7Horizontal dilution of precision 8 double 44
8Antenna altitude above/below mean-sea-level (geoid) 8 double metres 52
9Geoidal separation (see Figure C-6) 8 double metres 60
10 Age of Differential GPS data 8 double seconds 68
11 Differential reference station ID, 0000-1023 4 integer 76