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APPENDIX 4 DIGITAL INTERFACE
AP-9
GBS-GNSS satellite fault direction
GGA-Global positioning system (GPS) fix data
GLL-Geographic position-latitude/longitude
$--GBS,hhmmss.ss,x.x,x.x,x.x,xx,x.x,x.x,x.x,h,h*hh<CR><LF>
| | | | | | | | | | |
| | | | | | | | | | +--------- 11
| | | | | | | | | +--- 10
| | | | | | | | +------ 9
| | | | | | | +---------- 8
| | | | | | +-------------- 7
| | | | | +------------------- 6
| | | | +------------------------ 5
| | | +---------------------------- 4
| | +-------------------------------- 3
| +------------------------------------- 2
+------------------------------------------------ 1
1. Not used
2. Expected error in latitude
3. Expected error in longitud
e
4. Not used
5. Not used
6. Not used
7. Not used
8. Not used
9. GNSS System ID
10. GNSS Signal ID
11. Checksum
$--GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF>
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | +-- 11
| | | | | | | | | | | | | +---- 10
| | | | | | | | | | | | +--------- 9
| | | | | | | | | | +---+------------ 8
| | | | | | | | +---+------------------ 7
| | | | | | | +------------------------- 6
| | | | | | +---------------------------- 5
| | | | | +------------------------------- 4
| | | +----+--------------------------------- 3
| +---+--------------------------------------------- 2
+------------------------------------------------------------- 1
1. Not used
2. Latitude, N/S
3. Longitude, E/W
4. GPS quality indicat
or
5. Not used
6. Not used
7. Not used
8. Not used
9. Not used
10. Not used
11. Checksum
$--GLL,llll.ll,a,yyyyy.yy,a,hhmmss.ss,A,a*hh<CR><LF>
| | | | | | | |
| | | | | | | +------- 6
| | | | | | +--------- 5
| | | | | +----------- 4
| | | | +---------------- 3
| | +------+----------------------- 2
+--+----------------------------------- 1
1. Latitude, N/S
2. Longitude, E/W
3. Not used
4. Status: A=data valid, V=data invalid (See NOTE 1.)
5. Mode indicator (See NOTE 2.)
6. Checksum
NOTE 2: Positioning system Mode indicator:
A = Autonomous
D = Differential
E = Estimated (dead reckoning)
M = Manual input
S = Simulator
N = Data not valid
NOTE 1: The Mode indicator field supplements the status field (field 6). The
status field shoud be set to V = invalid for all values of operating mode except
for A = Autonomous and D = Differential. The positioning system Mode indicator
and status fields should not be null fields.