And if that information is accurate, their precise location can be revealed using a process called trilateration. Here's an example. Imagine a man shows up on a dating app as "200m away".

This allows it to find its location via trilateration (not to be confused with triangulation). The accuracy of course is determined by the accuracy of the distance measurement to the satellites.

The SubPos Ranger is based on [Blecky]’s entry for the 2015 Hackaday Prize, SubPos that used WiFi, RSSI, and trilateration to determine a receiver’s position in reference to three or more base ...

GPS altimetry works by using the geometric method of trilateration, which uses signals from four or more orbiting satellites. Altimeters used in aircraft are mounted within the aircraft’s ...