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water speed or sog
does anybody know, when calculating true wind dir+speed,which speed is used: SOG or Water speed? And more, if SOG is ipad (internal) and water speed is NMEA, is the anwer still the same? In my case it is important to know, my water speed NMEA allways is what so ever... On the other hand it is not very fun allway to shut the power of lok....