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GEODIAL Telematics - How accurate is a GPS-based speedometer? Many GPS devices display your current speed, based on a simple calculation of how much distance you are covering in a given time
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Are car speedometers accurate? How accurate is my speedometer? | startrescue.co.uk
Why doesn't the speed shown on my car's speedometer and sat-nav always match? - BBC Science Focus Magazine
Speedometer Vs GPS: Whose Speed Reading Is More Accurate? » Science ABC
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