Exactly, it should be trilateration. This problem is a very old and known in many location-based apps, which has been reported years ago. https://www.wired.com

Exactly, it should be trilateration. This problem is a very old and known in many location-based apps, which has been reported years ago. https://www.wired.com/2016/05/grindr-promises-privacy-still-leaks-exact-location/ https://www.wired.com/2016/05/grindr-promises-privacy-still-... Gay Dating Apps Promise Privacy, But Leak Your Exact Location