“In a process called –, a GPS receiver measures the precise time taken for radio signals from four or more satellites to travel to the receiver. The receiver then multiplies the time by the speed of a radio wave to calculate the distance between it and the satellite. When signals from the four or more satellites are processed in the same manner, the receiver’s built-in computer determines the point at which at least four satellite signals intersect on the Earth. This intersection then identifies the receiver’s latitude, longitude, and altitude. The more satellites that are used, the more accurate the location that is pinpointed.”
triangulation