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post #7 of Old 03-05-2018
chef2sail
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Re: GPS Speedo?

Quote:
Originally Posted by fallard View Post
A problem with using GPS for sailboat speed is that you are measuring speed over the bottom—not speed through the water.

If the water is moving over the bottom (i.e, there is a tidal current) you will be missing an important input to your integrated sailing instruments. Assuming your GPS data is independent, you won’t have a reading of true wind, for example. OTOH, if you don’t have integrated instruments, it probably won’t matter that much.
If you are a fanatic about boat speed Fallard is 100% correct. I only really put my paddle wheel in when racing or trying to fine tune sail setting.

Most of the time the GPS ( speed over the bottom) is fine for us.

Only if I were a racer would I spend the money to replace a thru hull and upgrade


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