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I'm not familiar with the Raymarine instruments, but you shouldn't be seeing fluctuations like that. Not sure if that would be a problem in the transducer or the "Brain", sounds like call to Raymarine is in order.
I doubt that you would be able to easily use the SOG from the GPS to determine TW, or even if that would give accurate readings in all wind/current conditions.
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John
SV Laurie Anne
1988 Brewer 40 Pilothouse
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