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According to the state ruling, the "device" in question is an "I phone" https://www.documentcloud.org/documents/408509-massachusetts...

It uses some technology (circa 1978) called "GPS".

We're living in the future!

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Quite frankly, I wouldn't certify that. Measuring based on data derived from the GPS chip (not the raw data), always at the mercy of the operating system not to hibernate your app.

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