Technical information
Page 70
6.9 Unused fields
Unused fields in the above sentences are listed in Table 9. below. All fields of
other input and output sentences that are not in this table are used.
Sentence Unused fields Description
AIR 9
10
11
12
Channel of Interrogation
Message ID 1.1 Station 1 reply slot
Message ID 1.2 Station 1 reply slot
Message ID 2.1 Station 2 reply slot
DTM 2
3
5
7
Local datum subdivision code
Lat offset, min, N/S
Longitude offset, min, E/W
Altitude offset, (meter)
GBS 4
5
6
7
8
Expected error in altitude
ID of most likely failed satellite
Probability of missed detection for
most likely failed satellite
Estimate of bias on most likely failed
satellite
Standard deviation of bias estimate
GGA 5
6
7
8
9
10
11
12
No. of satellites in use, 00-12
Horizontal dilution of precision
Antenna altitude above / below
mean sea level (geoid)
Units of antenna altitude, m
Geoidal separation
Units of geoidal separation, m
Age of diff. GPS data
Differential reference station ID
0000-1023
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