Any options to get the 'Speed' displayed more accurte

Discussion in 'General TomTom Discussion' started by ar1979, Jun 20, 2008.

  1. ar1979

    ar1979

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    TomTom Model(s):
    TomTom Go 720
    I noticed that the speed displayed in my TT720 is off by 4-5mph :mad: when I am in the speed range of 45-75mph. Is there any option to give an offset to the Speed so that the speed display is more accurate in this range.
    I think the issue is because of the error in the conversion from the GPS speed(which I think is in knots) to mph. So I would think that the error would vary with the speed range.
    If I can atlest have the offset helping in the 45-75mph range I would be happy. I know that some GPS units allow a general offset.
    Any suggestons, tips would be greatly appreciated.
     
    ar1979, Jun 20, 2008
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  2. ar1979

    Rick F.

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    Location:
    South FL
    TomTom Model(s):
    TomTom XL-335TM; Map 935.5811
    Actually, the TomTom is most correct and our car's speed reads low. Something about the manufacturer's tolerance for speedometers can be + 0% and - 10%, so most cars read low. Since GPS's calculate speed using satellite triangulation, they are most accurate (as long as you're traveling on a level highway). When my car's speedo reads 74, my TomTom indicates 70.

    For a long and interesting discussion on this, see this thread at Pocket GPS World:
    http://www.pocketgpsworld.com/modules.php?name=Forums&file=viewtopic&p=372216#372216

    and for one of the better posts in this thread:
    http://www.pocketgpsworld.com/modules.php?name=Forums&file=viewtopic&p=372644#372644

    Hope this helps.
     
    Last edited: Jun 20, 2008
    Rick F., Jun 20, 2008
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  3. ar1979

    Bama Rambler

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    Location:
    South Alabama
    TomTom Model(s):
    Go 720 with 920 POI's
    How do you know the GPS speed is off? Every GPS I've ever heard about is very accurate speed wise. To something like 1/10 of a mile per hour when traveling at a steady pace. If you're using your autos speedometer to gauge it they're notoriously wrong!
     
    Bama Rambler, Jun 20, 2008
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  4. ar1979

    ar1979

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    TomTom Model(s):
    TomTom Go 720
    Thanks Rick F and Bama.

    I was comparing the speed with the speedo of my car. I did not consider the speedometer tolerance and was ignorant about the numerous factors governing its accuracy.
    Thanks for the link, Rick, and again appreciate the inputs from you guys.
     
    ar1979, Jun 20, 2008
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