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Does anyone have a Faraday bag for phone that works? (lemmy.dbzer0.com)
submitted 1 year ago by to c/privacy@lemmy.ml
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[–] 2 points 1 year ago* (last edited 1 year ago) (1 child)

You must know something I don’t.

AFAIK, GPS works by fetching signals from satellites.

If you disable your Bluetooth/wifi antenna, you won’t know your relative location to other devices. If you disable your cellular antenna, you won’t know your relative location to cell towers. I presume that you would need some of that data to know your position relative to satellites but maybe I’m missing something. Maybe it receives data from satellites directly? Seems unlikely

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  • [–] 3 points 1 year ago

    Yes, GPS works by measuring your distance from several GPS satellites (based on the timing of the signals they send). If a few distances are known, it narrows it down to a point (the satellite orbits are known so you know where they are at any time).

    I've owned several stand-alone GPS receivers before phones started to include the feature.

    You can download offline maps to phones so that you can navigate without any phone signal.

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