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6
: Longitude East/West (Degrees, minutes and hundredths)
yyyyy.yy,a
= West
W
= East
E
7
: Speed over ground (knots)
x.x
8
: Course over ground (Degrees True)
z.z
9
: Date
ddmmyy
10
: Magnetic variation, East/West (Degrees)
r.r,a
= East
E
= West
W
11
: Mode indicator
a
12
: Checksum
*hh
NMEA VHW datagram
The NMEA VHW datagram contains the compass heading to which the vessel points, and
the speed of the vessel relative to the water.
Format
$--VHW,x.x,T,x.x,M,x.x,N,x.x,K*hh<CR><LF>
Description
1
: Talker identifier
$—
2
: Datagram identifier
VHW
3
: Heading (Degrees True)
x.x,T
4
: Heading (Degrees Magnetic)
x.x,M
5
: Speed relative to water (knots)
x.x,N
Resolution: 0.1 knots
6
: Speed relative to water (km/hr),
x.x,K
Resolution: 0.1 km/hr
7
: Checksum
*hh
406388/B
Datagram formats
281
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