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  1. #1
    rhorne1053's Avatar
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    Oct 2006
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    Speedometer vs gps

    What is the relation of speeds that you are getting comparing your speedometer to your gps. I ran my big red boat a little this afternoon and it just turned one hour. I ran it up to 55mph on the speedometer and looked at my gps and it was showing 61mph.

    This is totally different than what I get with my bass boat, it shows 75 on speedometer and only 69 on the same gps.

    It looks as if the speedometer is a little slow on the ultra or at least on mine. Has anyone else checked to see the difference? Roger


  2. #2
    Hydrotoys's Avatar
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    Jul 2005
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    Yup. They are all different. It is a paddle wheel, that will read different. GPS is accurate, if you are holding a steady speed.

    I did a comparison, and it was fairly accurate up to about 31mph, then sat there until the ski hit 38, then jumped up to 38. It read about 65 at 65, if memory serves.

  3. #3
    I ran flat out today at 58 mph on the speedo with two little kids in front of me and 3/4 gas. I had my GPS with me but I couldn't find a place to put it. I am pretty sure I was at max. speed.


    [quote=rhorne1053;213328]What is the relation of speeds that you are getting comparing your speedometer to your gps. I ran my big red boat a little this afternoon and it just turned one hour. I ran it up to 55mph on the speedometer and looked at my gps and it was showing 61mph.

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