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GPS speed calibration


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After surfing most of the season at what I thought was 10.8 we went out last week and wakeboarded all day. We all usually ride at 24 or so in a fully ballasted boat. We all felt the speed was way fast but knew it was GPS so just went with it. Well over the weekend I was just cruising the lake and decided to check speed with speed app on phone and it was off 4 MPH at 25. Boat going way faster than speed shown. Not hard to fix in the setup screen but I would have never thought GPS would require calibrating. Now everything feels normal while wakeboarding and we are surfing at 11.6-12 where I felt we should be.

Not really asking a question just letting others know to check GPS speed. Maybe I am the only one that didn't know and if so sorry to waste everyone's time. I feel kind of dumb but all previous boats have been paddle wheel and I knew to calibrate them.

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Did you have a bunch of wet towels or something over the GPS antenna? GPS does not need calibrating, and normally will give about 0.1 meter/second accuracy. The main thing that could throw it off is loss of signals from the satellites. Make sure the antenna has clear view of the sky and try again.

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No blockage of signal Gary. I am with u thtrog it has to be after the GPS unit sends data to the speed controller. I wonder if the built in nav has speed. I haven't activated it so I was just curious. I was thinking of switching to paddle wheel to see how it was but haven't. I have had to shut down the system once this summer due to not showing speed at all.

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