Go get two identical GPS units, such as the E-Trek that is very popular in kneelers. Always use both in the boat when testing. Then report back the results after a couple years. I always felt experince speaks much louder than any amount of book learning.
And if you want to get real fancy, get three, one of a different model or manufaturer. Yes, they all reported within a MPH or two. But who is not trying to achieve that extra half MPH ?
Also, think about testing on moving water.... GPS works off the bottom of the moving water such as a river. So what you see testing on a river or racing on a river will read different speeds. Just my experience is all. Maybe i am doing something wrong ?
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