Справочник Пользователя для SRT Marine Systems plc 425-0002

Technical Information

Page  67

Unused fields in the above sentences are listed in Table 8 below. All fields of 
other input and output sentences that are not in this table are used.

.

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 

GNS

5
6
7

8
9
10

Number of satellites in use, 00-99 
Horizontal dilution of precision
Antenna altitude, m, above mean-
sea-level 
Geoidal separation, m
Age of differential data 
Differential reference station ID