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    3. which is right my car speedometer or the sat navigation speedometer
    which is right my car speedometer or the sat navigation speedometer

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    0  Views: 354 Answers: 1 Posted: 12 years ago
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      Car speedometers are not allowed by law to read less than the true speed, and therefore are designed to read slightly higher than the true speed. The law allows them to read from +0% to +10% of the true speed, but with new, correctly inflated tyres most will read between +1% to +5%. Also they read the speed at the gearbox, not at the road surface, so the amount they over-read increases as tyres wear down (or if the tyres are under-inflated). However the sample rate is much higher, so as your speed changes the speedometer reacts more quickly than the sat-nav.


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      12 years ago. Rating: 4
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        Russrocks

        I agree. Your car speedometer is more accurate.
        commented 12 years ago


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