Furuno FR-2105-B - Manual (Page 159)

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Channel 2 input
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>
Checksum
Status: stern ground speed *1
Stern transverse ground speed (knots) *1
Status: stern water speed *1
Stern transverse water speed (knots) *1
Speed status (A = data valid, V = data invalid)
Transverse ground speed (knots)
Longitudinal ground speed (knots)
Status (A = data valid, V = data invalid)
Transverse water speed (knots)
Longitudinal water speed (knots)
Priority N>km
*1: Edition 2 only
VHW - Water speed 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 Priority: N>K
Heading (M = magnetic bearing)*1
Heading (T = true bearing)*1
*1: Not used
HDT
$HDT,x.x,T*hh<CR><LF>
Checksum
Heading, degrees true