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Old 01-22-2013
MarkSF MarkSF is offline
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Calculating true wind

I have a Simrad is20 wind transducer and display. The display is on the NMEA 2000 network, and is using the SOG and COG from the chartplotter, to calculate true wind.

Am I right in thinking that I really need a heading sensor to calculate true wind accurately?

I think that the calculation is assuming that the boat's heading is the same as the course, which is erroneous if there is a current at any angle to the heading.

So I think I need to use heading, and GPS SOG. Is this right?
1984 Bristol 31.1
Alameda, California, USA
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