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Re:Router Security by alexwasserman on Saturday July 30, 2022 @03:44PM (#32289666)
It’s called Wi-Fi Positioning System: https://en.m.wikipedia.org/wiki/Wi-Fi_positioning_system

There are both open and proprietary versions.

I think early iPhones used it (with cell site data too), before they had GPS. Can’t remember their name for it.

But, all big populated areas are mapped and understood.

See Hybrid Positioning too, which is combining all available data, including Wi-Fi, to aid in rapid and accurate location information: https://en.m.wikipedia.org/wiki/Hybrid_positioning_system

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