The technology behind a mobile with GPS relies on a network of 31 satellites orbiting the Earth. The phone's receiver calculates its position by measuring the time it takes to receive signals from at least four of these satellites. The more satellites it can connect to, the more accurate the location data. In urban areas or indoors, where satellite signals may be weak, the phone can s... https://mobileattendance.com.sg/mobile-with-gps/