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post #19 of (permalink) Old 5th October 2008
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Originally Posted by Bob925 View Post
Some say that the satnavs speedo is more accurate anyway
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
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