Lot of vehicles now days, (certainly not my old bomb)use satnav...

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    Lot of vehicles now days, (certainly not my old bomb)
    use satnav or whatever, which will give you a reasonable speed estimate.

    A GPS, which I have a top of the range Garmin, can
    only tell you where you are.

    In conjunction with a good chronograph etc, would be 100% accurate, but only on straight/flat road.

 
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