JRC JLN-900 - Dual Doppler Velocities (-VBW)

11-13
3.1.11 Dual Doppler Velocities (--VBW)
Water-referenced and ground-referenced speed data.
Note that this sentence has been extended. The speed logs may transmit the shorter version of
the sentence with only the first seven fields plus the checksum field.
1 2 3 4 5 6 7 8 9 A B C
$--VBW,x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*hh<CR><LF>
Field # Field Type Definition Note
1
Name
Water-referenced and ground-
referenced speed data
VDVBW
2
x.x
Longitudinal water speed knots
3
x.x
Transversal water speed knots
4
A
Status water speed A = data valid, V = data invalid
5
x.x
Longitudinal ground speed knots
6
x.x
Transversal ground speed knots
7
A
Status ground speed A = data valid, V = data invalid
8
x.x
Stern Transversal water speed knots
9
A
Status stern transversal water
speed
A = data valid, V = data invalid
A
x.x
Stern Transversal ground speed knots
B
A
Status stern transversal ground
speed
A = data valid, V = data invalid
C
hh
Check sum
Unavailable data are transmitted as null fields.
Example: speed through water 10.05 knots, longitudinal speed over ground 11.02 knots,
transversal speed over ground -0,05 knots.
$VDVBW,10.05,,A,11.02,-0.05,A,,V,,V*