Instruction manual

Page 120 Z-12 Real-Time Sensor Operation and Reference Manual
$GPVTG,ttt,c,ttt,c,ggg.gg,u,ggg.gg,u*cc
where each field is as defined in Table 4.70.
Example:
Query: $PASHQ,VTG,B or
Set: $PASHS,NME,VTG,A,ON
Typical Response:
$GPVTG,179,T,193,M,000.11,N,000.20,K*3E
where each item is as described in Table 4.71.
Table 4.70: VTG Structure
Field Description
ttt True track/true course over ground, ttt = 000 to 359 degrees
c True course over ground marker, c = always T (true course)
ttt Magnetic track/magnetic course over ground, ttt = 000 to 359 degrees
(output only if magnetic variation option (M) is installed in receiver)
c Magnetic course over ground marker, c = always M (magnetic course)
ggg.gg Speed over ground, ggg.gg = 000 to 999.99 knots
u Speed over ground units, u = N (nautical miles per hour)
ggg.gg Speed over ground, ggg.gg = 000 to 999.99 kilometers per hour
u Speed over ground units, u = K (kilometers per hour)
Table 4.71: Typical VTG Message
Item Description
$GPVTG Header
178 Course over ground in degrees
t True course over ground marker
193 Magnetic course over ground
M Magnetic course over ground marker
000.11 Speed over ground in knots
N Knots
000.20 Speed over ground in kilometers/hour
K Kilometers/hour
3E Message checksum in hexadecimal