Seatex DPS 132 Installation Manual, rev. 0 Installation
34
VBW Message
The VBW message contains water referenced and ground referenced speed data. The message
is as specified in NMEA 0183 versions 2.2, 2.3 and 3.0. The message structure is as follows:
$--VBW,x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*cc
Table 21 describes the VBW message fields.
Field Description
x.x Longitudinal water speed in knots.
x.x Transverse water speed in knots.
A Status: Water speed, A = valid data.
x.x Longitudinal ground speed in knots.
x.x Transverse ground speed in knots.
A Status: Ground speed, A = valid data.
x.x Stern transverse water speed in knots.
A Status: Stern water speed, A = valid data.
x.x Stern transverse ground speed in knots.
A Status: Stern ground speed, A = valid data.
*cc Checksum.
Table 21 VBW message fields
Note Transverse speed: "-" = port, Longitudinal speed: "-" = astern
VTG Message
The VTG message contains actual course and speed relative to the ground. The message is as
specified in NMEA 0183 versions 2.2, 2.3 and 3.0. The message structure is as follows:
$GPVTG,ttt.tt,T,ttt.tt,M,ggg.gg,N,ggg.gg,K*cc
Table 22 describes the VTG message fields.
Field Description
ttt.tt True course over ground in degrees.
T True course over ground marker.
ttt.tt Magnetic course over ground in degrees.
M Magnetic course over ground marker.
ggg.gg Speed over ground in knots.
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