Table of Contents
Advertisement
$GPVTG
This message transfers velocity, course over ground, and ground speed. Following is an example.
$GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*23
The $GPVTG message format is shown below.
Field
Message ID
Course (true)
Reference
Course (magnetic)
(1)
Reference
Speed
Units
Speed
Units
(2)
Mode
Checksum
<CR> <LF>
(1)
SiRF does not support magnetic declination. All "course over ground" data are geodetic WGS84 directions.
Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA message description.
(2)
Example
Unit
$GPVTG
309.62
degree
T
degree
M
0.13
knot
N
0.2
km/hr
K
A
*23
Notes
VTG protocol header.
Measured heading
T = true heading
Measured heading
M = magnetic heading
Speed in knots
N = knots
Speed
K = km/hour.
A=Autonomous, D=DGPS, E=DR.
Message terminator.
20
(1)
T-368 User's Guide v1.0
Advertisement
Table of Contents
