UTC Time | 161229.487 |
|
|
| hhmmss.sss | |
Status |
| A |
|
|
| A=data valid or V=data not valid |
Latitude | 3723.2475 |
|
|
| ddmm.mmmm | |
N/S Indicator |
| N |
|
|
| N=north or S=south |
Longitude | 12158.3416 |
|
|
| dddmm.mmmm | |
E/W Indicator |
| W |
|
|
| E=east or W=west |
Speed Over | 0.13 |
| knots |
|
| |
Ground |
|
|
|
|
|
|
Course Over | 309.62 |
| degrees |
| True | |
Ground |
|
|
|
|
|
|
Date | 120598 |
|
|
| ddmmyy | |
Magnetic |
|
|
| degrees |
| E=east or W=west |
Variation(1) |
|
|
|
|
|
|
Checksum | *10 |
|
|
|
| |
<CR> <LF> |
|
|
|
|
| End of message termination |
NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are geodetic WGS84 directions.
5.7. Course Over Ground and Ground Speed (VTG)
Table
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table
Name |
| Example |
| Units |
| Description |
Message ID |
| $GPVTG |
|
|
| VTG protocol header |
Course | 309.62 |
| degrees |
| Measured heading | |
Reference |
| T |
|
|
| True |
Course |
|
|
| degrees |
| Measured heading |
Reference |
| M |
|
|
| Magnetic(1) |
Speed | 0.13 |
| knots |
| Measured horizontal speed | |
Units |
| N |
|
|
| Knots |
Speed | 0.2 |
| km/hr |
| Measured horizontal speed | |
Units |
| K |
|
|
| Kilometers per hour |
Checksum |
| *6E |
|
|
|
|
<CR> <LF> |
|
|
|
|
| End of message termination |
12
