NMEA Commands 283
NMEA Commands
Typical VTG message:
$GPVTG,179.00,T,193.00,M,000.11,N,000.20,K*3E
Table 8.56 outlines the response message.
c8 Speed unit of measure (always K; KPH) K
d9 Positioning system mode indicator
• A—Autonomous mode
• D—Differential mode
• E—Estimated (dead reckoning) mode
• M—Manual input mode
• S—Simulator mode
• N—Data not valid
A, D, E, M, S, or N
*hh Checksum 2-character hex
Table 8.56. Typical VTG Message
Field Description
$GPVTG Header
179.00 Course over ground (degrees)
T True course over ground marker
193.00 Magnetic course over ground
M Magnetic course over ground marker
000.11 Speed over ground (knots)
N Nautical miles per hour
000.20 Speed over ground in kilometers/hour
K Kilometers per hour
*3E Checksum
Table 8.55. $GPVTG Response Structure
Field Description Range
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