Join Date: Feb 2006
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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?
Currently in moi's garage:
An Audi R8 in my dreams and Oily's Zafira