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Satnav Speed Vs. Speedometer Speed

  • 26-03-2009 12:26pm
    #1
    jozi
    Registered Users, Registered Users 2 Posts: 5,391 ✭✭✭


    Meant to post this some time ago.

    Was driving through England in a van last year with a broken speedo so was using the SatNav. On the way back home my brother was following in a mini he was bringing over and he complained is was over the speed limit according to his speedo but the satnav said 100kph/60ishmph.

    Same in parents car, 100kph on the satnav is over 100kph on the speedo, close but still not 100.

    Which is more accurate? Satnav? Is the speedo displaying slower because they are always a little of calibration?

    What about speed cameras, or the garda with their guns, how are they calibrated? If im travelling at 100kph (satnav) the speedo is over 100kph, could this lead to a speeding fine?

    Just something I've been wondering.


Comments

  • #2
    Alun
    Registered Users, Registered Users 2 Posts: 21,499 ✭✭✭✭Alun


    Do a search for the other 83,475 (number possibly made up) threads in this forum on this very same question.


  • #3
    Mr Benevolent
    Closed Accounts Posts: 12,456 ✭✭✭✭Mr Benevolent


    I think the speedo tends to show a % or two faster then you're actually going, to ensure you're sticking to the limits. GPS speed is more accurate but not perfectly accurate due to the shape of the earth.


  • #4
    seanybiker
    Closed Accounts Posts: 10,898 ✭✭✭✭seanybiker


    Confab wrote: »
    I think the speedo tends to show a % or two faster then you're actually going, to ensure you're sticking to the limits. GPS speed is more accurate but not perfectly accurate due to the shape of the earth.
    Thats basically it really.


  • #5
    Stephen
    Registered Users, Registered Users 2 Posts: 18,484 ✭✭✭✭Stephen


    Speedos overstate your speed to legally cover the car manufacturers' arses in the case of some muppets using the speedo being wrong as a defence against speeding charges.


  • #6
    EPM
    Closed Accounts Posts: 13,822 ✭✭✭✭EPM


    seanybiker wrote: »
    Thats basically it really.

    You get a better reading with a 3d GPS as opposed to a 2d one as it takes inclines etc into account...but otherwise what ^^^^^^^^^^ said


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  • #7
    Anan1
    Registered Users, Registered Users 2 Posts: 22,815 ✭✭✭✭Anan1


    I've never seen a GPS that doesn't calculate altitude (inaccurately..).


  • #8
    [Deleted User]
    Posts: 17,378 ✭✭✭✭ [Deleted User]


    Stephen wrote: »
    Speedos overstate your speed to legally cover the car manufacturers' arses in the case of some muppets using the speedo being wrong as a defence against speeding charges.
    why would you consider someone using that defence a muppet?


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