Presumably, the location tracking is just a variant of the Wi-Fi-based positioning systems commonly used today. Whereas the system is normally used to provide

Presumably, the location tracking is just a variant of the Wi-Fi-based positioning systems commonly used today. Whereas the system is normally used to provide a device with its location, here it's used to track the device's location. This requires having a network of Wi-Fi access points sharing data. https://en.wikipedia.org/wiki/Wi-Fi_positioning_system https://en.wikipedia.org/wiki/Wi-Fi_positioning_system