JRC JLR-21 - Page 143

Appendix 2-13
[2-3] Data Formats
■ VBW - Dual ground/water speed
$VDVBW , uxx.xx , uxx.xx , A , uxx.xx , uxx.xx , A , uxx.xx , A , uxx.xx , A * hh <CR><LF>
1 2 3 4 5 6 7 8 9 10 11
1: Longitudinal water speed (see Note), knots
2: Transverse water speed (see Note), knots
3: Status: water speed
A = data valid
V = data invalid
4: Longitudinal ground speed (see Note), knots
5: Transverse ground speed (see Note), knots
6: Status: ground speed
A = data valid
V = data invalid
7: Stern transverse water speed (see Note), knots
8: Status: stern water speed
A = data valid
V = data invalid
9: Stern transverse ground speed (see Note), knots
10: Status: stern ground speed
A = data valid
V = data invalid
11: Checksum
Note Transverse speed: "-" = port,
Longitudinal speed: "-" = astern.
■ CUR - Water current layer – Multi-layer water current data
$VDCUR , A , x , x , x.x , x.x , T ,x.x , x.x , x.x , T , B * hh <CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12
1: Validity of the data
A = Valid
V = not valid
2: Data set number, 0 to 9
3: Layer number
4: Current depth in metres
5: Current direction in degrees
6: Direction reference in use, True/Relative T/R
7: Current speed in knots
8: Reference layer depth in metres
9: Heading in degrees
10: Heading reference in use, True/Magnetic T/M
11: Speed reference
B = Bottom track
W= Water track
P= Positioning system
12: Checksum