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APPENDIX 4 DIGITAL INTERFACE
AP-17
VTG-Course over ground and ground speed
GGA-Global positioning system (GPS) fix data
ZDA-Time and date
$--VTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh<CR><LF>
| | | | | | | | | |
| | | | | | | | | +------- 6
| | | | | | | | +--------- 5
| | | | | | +---+----------- 4
| | | | +--+----------------- 3
| | +--+----------------------- 2
+-+----------------------------- 1
1. Course over ground, degrees true
2. Not used
3. Speed over ground, knots
4. Speed over ground, km/h
5. Mode indicator (See NOTE.)
6. Checksum
NOTE : The Mode indicator provides status information about the operation of the source
device (such as positioning systems, velocity sensors, etc.) generating the sentence, and the
validity of data being provided. the possible indications are as follows:
A = Autonomous
D = Differential
E = Estimated (dead reckoning)
M = Manual input
P = Precise. Satellite system used in precision mode. Precision mode is defined as: no
deliberate degradation (such as selective availability) and higher resolution code
(P-code) is used to compute position fix. P is also used for satellite system used in
muti-frequency, SBAS or Precise Point Positioning (PPP) mode.
S = Simulator
N = Data not valid
The Mode indicator field should not be a null field.
$--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
$--ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
| | | | | | |
| | | | | | +--------- 7
| | | | | +----------- 6
| | | | +-------------- 5
| | | +------------------ 4
| | +---------------------- 3
| +------------------------- 2
+--------------------------------- 1
1. UTC
2. Day, 01 to 31 (UTC)
3. Month, 01 to 12 (UTC)
4. Year (UTC)
5. Local zone hours, 00h to +-13h
6. Local zone minutes, 00 to +59 as local time
7. Checksum