Join Date: Jul 2007
Location: Westchester, NY
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Re: GPS determined speed
Thanks for the replies which pretty much confirm that SOG is not terribly accurate and completely useless for trimming sails.
On the other hand my B&G has supposed accuracy to .01 knots, and you can dampen to display. Forget the sample rate... but you CAN trim sails using the speed thru the water... even with a fouled bottom or transducer.
Next time I am aboard and in the harbor at slack (high) I will conduct some tests of my various speed reporters. I will need to get them all reporting the same speed and calibrate the speedo as necessary.
pay attention... someone's life depends on it