NAVIS NavDP 4000. Operation Manual
VTG Message: Track Made Good and Ground Speed
Navis provides two types of VTG message format: with (NMEA 2.3 and later) and without FAA mode indicator.
The message format:
$--VTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh
where:
x.x
— Track Degrees
T
— True
x.x
— Track Degrees
M
— Magnetic
x.x
— Speed Knots
N
— Knots
x.x
— Speed Kilometers Per Hour
K
— Kilometers Per Hour
a
— FAA mode indicator (see Note 1)
hh
— Checksum
Example
$GPVTG,288.2,T,,,00.8,N,01.6,K,A*4F
NOTE!
1: The mode indicator provides status information and/or validity of
operating devices (such as positioning systems, velocity sensors, etc.).
The possible indications are as follows:
A
— Autonomous mode;
D
— Differential mode;
E
— Estimated (dead reckoning) mode;
M
— Manual input mode;
P
— Precise. Satellite system used in precision mode.
S
— Simulator mode;
N
— Data not valid.
NOTE!
The mode indicator field should not be a null field.
ZDA Message: Time & Date
The message format:
$--ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh
where:
hhmmss.ss
— UTC time (hours, minutes, seconds, milliseconds)
xx
— UTC day (01–31)
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Doc. 000.JDP-10000-OME, rev.3.3.13/“2102.$–17A-Advanced”
