Location data can come from a lot of things that are being pieced together into a really good guess even when parts are missing. GPS and the other satellites li

Location data can come from a lot of things that are being pieced together into a really good guess even when parts are missing. GPS and the other satellites like GLONASS. Nearby WiFi hotspots since they are all pretty much known locations. What cell towers you are connected to, which are also known locations, and the signal strength getting you general ranges. Can even be done with bluetooth beacons within building like malls and conference centers I believe. And accelerometer and compass data to fill in gaps too.