Services
E220 Series Cellular Router User Guide 203
• $GPVTG,0.0,T,0.3,M,0.0,N,0.0,K,A*20
Parameters Description
MID VTG Parameters
MID VTG Protocol Header
Example – $GPVTG
Course Measured heading
Example – 0.0 degrees
Reference True
Example – T
Course Measured heading
Example – 0.3 degrees
Reference Magnetic
(1)
Example – M
Speed Measured horizontal speed
Example – 0.0 knots
Units Knots
Example – N
Speed Measured horizontal speed
Example – 0.0 km/hr
Units Kilometers per hour
Example – K
Mode Indicates
• A – Autonomous
• D – DGPS
• E – DR
• N – Output Data Not Valid
• R – Course Position
(2) (3) (4)
• S – Simulator
Example – A
Checksum *20
<CR><LF> End of message termination
Table 11.8-4: VTG Data Format
(1)
CSR 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.
(3)
This feature is supported in the GSD4e product only.
(4)
This feature is supported in the GSD4e product, version 1.1.0 and later.
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