We have talked about/posted stuff like this for a while. It is something that most people never expected, that your WiFi AP combined with things like google maps mapping your GPS location with your MAC address could create a highly accurate non-consensual surveillance network. I built something similar to this back in the early 2000's and saw the potential for abuse but by then.. I am sure it was already being abused if I could figure it out. Same thing with blutooth id's that everyone leaves turned on all of the time... Archive: https://archive.today/xs3hS From the post: >>Wi-Fi-based Positioning Systems (WPSes) are used by modern mobile devices to learn their position using nearby Wi-Fi access points as landmarks. In this work, we show that Apple's WPS can be abused to create a privacy threat on a global scale. We present an attack that allows an unprivileged attacker to amass a worldwide snapshot of Wi-Fi BSSID geolocations in only a matter of days. Our attack makes few assumptions, merely exploiting the fact that there are relatively few dense regions of allocated MAC address space. Applying this technique over the course of a year, we learned the precise locations of over 2 billion BSSIDs around the world.