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post #8 of Old 08-12-2019
pdqaltair
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Re: GPS determined speed

Quote:
Originally Posted by denverd0n View Post
Well, I wouldn't say that SOG from a GPS is "not terribly accurate." For what it is, and understanding how it is determined, it is quite remarkably accurate.

On the other hand, I agree that it is not a great tool for adjusting sail trim. For that a traditional speed log is much better.
Maybe. But speed logs are notorious for fouling. And even if perfectly clean, the wind oscillates and fluctuates and sea state makes a difference. A trial horse, or even a similar boat on a close, parallel course is usually far more telling. And though it will look and feel like you are racing, you are really just learning your boat.

Targets are good, but only as a reasonableness check, because the computer does not know all of the variables.

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