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post #6 of Old 06-25-2014
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Re: Raymarine speedo question

I'm with jgeissinger on this one. Copper based bottom paint can interfere with the hall effect sensor picking up the signal from the magnets in the spinning paddlewheel. I painted mine once (Standard Horizon instruments) and the speed wouldn't work. Cleaned the paint off and it was fine. A light coating of non-copper antifouling is probably OK.
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