Ken — let’s not confuse True Wind Direction with True Wind Angle. Yes, you would need heading info for true wind direction; but true wind angle is referenced to the bow of the boat. The "True Wind" vectors that display on the Raymarine chartplotters are, I believe, just TWA referenced to COG boat direction if there’s no heading data available from, say, an autopilot heading sensor.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > On Aug 11, 2015, at 6:48 PM, Ken Heaton via CnC-List <cnc-list@cnc-list.com> > wrote: > > I'm pretty sure the Raymarine Wind needs course from an outside source to > display True Wind. The source of course info could be an autopilot or other > compass in the system. > > I'm sure Fred can confirm that.
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