Installation manual

Simrad SH80
140
851--164300 / C
Speed log
The SH80 can interface to an external speed log via Ethernet, or a
serial line using the NMEA 0183 standard for reception of the
vessel speed. The sonar will receive the following proprietary and
standard NMEA telegrams:
• Water referenced and ground referenced speed data
• Actual course and speed relative to the ground
Water referenced and ground referenced speed data
$??VBW,-mm.mm,-nn.nn,T, -mm.mm, -nn.nn,T<cr><lf>
where (from left towards right):
Component Content
?? Tal k e r
VBW Identifier code for the type of system used
mm.mm longitude water speed (indication sign + or --)
nn.nn transverse water speed (don’t care)
T A or V = water_track status:
A=data valid, V=data invalid
mm.mm longitude ground speed (indication sign + or --)
nn.nn transverse ground speed (don’t care)
T A or V = bottom_track status:
A=data valid, V=data invalid
Actual course and speed relative to the ground
$??VTG,x.x,T,x.x,M,x.x,N,x.x,K<cr><lf>
where (from left towards right):
Component Content
?? Tal k e r
VTG Identifier code for the type of system used
x.x,T Course, in degrees true
x.x,M Course, in degrees magnetic
x.x,N Speed, resolution 0.1 knots
x.x,K Speed, resolution 0.1 km/t