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Do you want to know how GPS knows where you ae or just how it knows it must follow the roads ?
The roads bit is easy, the computer is programmed to only stay within the lines of the programmed roads. The roads programme is very large, thats why it has to be on a DVD. The Nav computer is also pretty powerfull and has its own programming onboard.
These arnt simple programmes, but very complex ones. Thats why a new nav DVD costs around R3,000
The company Navtec makes the roadmap data for BMW and a few other manufacturers
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