Vtg - Course Over Ground And Ground Speed - Globalsat ER-506 Hardware Data Sheet And User Manual

ER-506
High Performance GPS Module

VTG - Course Over Ground and Ground Speed

Note – Fields marked in italic
message description
Table B-10 contains the values for the following example:
$GPVTG,309.62,T,,M,0.13,N,0.2,K,A*23
Table B-10 VTG Data Format
Name
Message ID
Course
Reference
Course
Reference
Speed
Units
Speed
Units
Mode
Checksum
<CR><LF>
1. SiRF Technology Inc. does not support magnetic declination. All "course over ground" data
are geodetic WGS84 directions.
2. Position was calculated based on one or more of the SVs having their states derived from
almanac parameters, as opposed to ephemerides.
red apply only to NMEA version 2.3 (and later) in this NMEA
Example Units
$GPVTG
309.62 degrees Measured heading
T
degrees Measured heading
M
0.13 knots
N
0.2 Km/hr
K
A
*23
Description
VTG protocol header
True
1
Magnetic
Measured horizontal speed
Knots
Measured horizontal speed
Kilometers per hour
A=Autonomous, D=DGPS,
E=DR
N=Output Data Not Valid
2
R= Coarse Position
S=Simulator
End of message termination
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