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Old 11-28-2008
Rockter Rockter is offline
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SEMjim :

It can't. You are right.
The central processor must know true boat speed and true heading before it can make that correction. If there is a tide running, even boat water speed will not do it, it has to be groundspeed, so a GPS feedback is needed.
Happily, relative wind speed and direction are more important.
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