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-8.11-
VBW - Dual ground/water speed: This sentence to be expanded as shown below:
$--VBW, x.x, x.x, A, x.x, x.x, A, x.x, A, x.x, A *hh<CR><LF>
Checksum
Status
2
, stern ground speed A = data valid
V = invalid
Stern transverse ground speed*
1, 2
, knots
Status
2
, stern water speed*, A = data valid
Stern transverse water speed*
1, 2
, knots
Status, ground speed*, A = data valid
Transverse ground speed
1
, knots
Longitudinal ground speed
1
, knots
Status, water speed, A = data valid
Transverse water speed
1
, knots
Longitudinal water speed
1
, knots
* = Not used
NOTES
1. Transverse speed: “-“ = port, Longitudinal speed: “-“astern.
2. For vessels equipped with dual water and/or ground speed systems ; data for the equipment mounted towards the
stern are reported in these fields.
VHW - Water speed (R-type only) and heading
The compass heading to which the vessel points and the speed of the vessel relative to the water.
$--VHW, x.x, T, x.x, M, x.x, N, x.x, K *hh<CR><LF>
Checksum
Water speed, K = km/h *
Water speed, knots * (R-type only)
Longitudinal heading (M = magnetic bearing) *
Longitudinal heading (T = true bearing) *
Not used *
VTG - Course over ground and ground speed (R-TYPE ONLY)
The actual course and speed relative to the ground.
$--VTG, x.x, T, x.x, M, x.x, N, x.x, K*hh<CR><LF>
Checksum
Speed, K = km/h *
Speed, knots *
Course degrees magnetic *
Course degrees true
Not used *