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post #20 of (permalink) Old 5th October 2008 Thread Starter
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Originally Posted by daft_plonk View Post
they will be, a sat nav uses 3 GPS satelites to pin point your position with a 10 metre error, and this calculates your speed by using the rate at which your longitudant and lateral positions change.

the cars speedo uses a little wheel and sensor, usually in the gearbox
So why does mine only beep at 80mph?
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