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Thread: Sat Nav Check

  1. #1
    On a Sabbatical VauxVeteran's Avatar
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    Default Sat Nav Check

    Anyone got a unit that tracks the car speed? if so could you see if it matches up with the speedo, thx.

  2. #2
    Regular Member Gsi3.2's Avatar
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    Default

    our tomtom doesn't match the speedo..at an indicated 90 mph the gps speed is 83mph, so the speedo overreads..
    Last edited by Gsi3.2; 28th July 2007 at 19:46.

  3. #3
    Ex Vec-C Admin ed taylor's Avatar
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    Default

    Yes our tom tom shows a higher speed than the speedo. might not be a bad thing if the car,s speedo is set slower than correct.

  4. #4
    Regular Member BigLad's Avatar
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    Default

    Ive got tomtom and at an indicated 70mph on speedo the satnav says 67, the satnav using GPS is the more accurate.

  5. #5
    On a Sabbatical VauxVeteran's Avatar
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    Default

    Phew, thx guys it's not only mine then, I'm showing 4mph out, I think it's the nav that's slower though, pretty sure if I'm doing 70 on the clocks it's only showing 66mph.

  6. #6
    Regular Member fireblade's Avatar
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    Default

    My TomTom is always about 3MPH slower than my speedo, oddly my snooper is always 1mph different than my tomtom
    From memory I think a speedo is allowed to be up to 10% fast but cannot be slow by law i.e 70mph indicated is ok anything from 63mph to 70 mph
    It is not allowed for a speedo to show 63mph when actual is 70mph
    All my old Fords were always 8% fast(mondeo,c-max) Veccy is a very close match to actual speed

  7. #7
    Regular Member sonic's Avatar
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    Default

    At 70MPH on the speedo my TomTom says 66MPH.
    Your OK VV!

  8. #8
    Regular Member G.O'Rilla's Avatar
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    Default

    I have a pogo (ex origin) GPS camera locator - same results as Sonicboom

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    Regular Member neilshaw1980's Avatar
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    Default

    My navigon sat nav shows 5mph slower than speedo. Thats with 225/45/17 tyres.

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    Default

    Speedos have to err on the side of caution so they invariably overread. The GPS speed is correct.

    Edit: what fireblade said.

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