VBW - Dual Ground/Water Speed
VBW Tag Fields
 1 2 3 4 5 6 7
 $--VBW, x.x, x.x, A, x.x, x.x, A *hh&lt;CR&gt;&lt;LF&gt;

 Field Number:

 Longitudinal water speed, "-" means astern
 Transverse water speed, "-" means port
 Status, A = Data Valid
 Longitudinal ground speed, "-" means astern
 Transverse ground speed, "-" means port
 Status, A = Data Valid
 Checksum
