Appendix-25
・VBW – Dual ground/water speed
$--VBW, x.x, x.x, A, x.x, x.x, A, x.x, A, x.x, A*hh<CR><LF>
1
2 3 4 5 6 7 8 9 10
1：Longitudinal water speed (see Note 1), knots
2：Transverse water speed (see Note 1), knots
3：Status (see Note 2): water speed, A = data valid, V = data invalid
4：Longitudinal ground speed (see Note 1), knots
5：Transverse ground speed (see Note 1), knots
6：Status (see Note 2), ground speed, A = data valid, V = data invalid
7：Stern transverse water speed (see Note 1), knots
8：Status (see Note 2): stern water speed, A = data valid, V = data invalid
9：Stern transverse ground speed (see Note 1), knots
10：Status (see Note 2): stern ground speed, A = data valid, V = data invalid
NOTE 1 Transverse speed: "-" = port,
Longitudinal speed: "-" = astern.
NOTE 2 The status field should not be a null field.
・VHW – Water speed and heading
$--VHW, x.x, T, x.x, M, x.x, N, x.x, K*hh<CR><LF>
1 2 3 4 5 6 7 8
1：Heading, degrees true
2：Heading, degrees true
3：Heading, degrees magnetic
4：Heading, degrees magnetic
5：Speed, knots
6：Speed, knots
7：Speed, km/h
8：Speed, km/h
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