How can your approximate location be found using WiFi SSIDs?
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When anyone approaches your location with Google Maps running in the foreground Google records GPS position and the signal strength of all nearby wi-fi access points and Bluetooth devices. Google also collects that information using a background service running on all Android phones. They don’t do that aggressively all the time but occasionally so it takes time. Just a single measurement is enough to associate a wi-fi ssid a GPS location with a 300 ft uncertainty. The more measurements they collect the lower the uncertainty.
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