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+ - How satnav maps are made->

nk497 writes: "Satnav firms go to great lengths to keep their maps up-to-date. This feature reveals exactly how TomTom, Google, OpenStreetNav and NavTeq ensure their databases are accurate with millions of updates a day from their own mapping cars, tracking systems on third-party fleets, and user data — and shows which method leads to the most accurate satnav system."
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How satnav maps are made

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