How does GPS pinpoint your exact location anywhere?

GPS works by using a network of about 30 satellites orbiting Earth, each continuously broadcasting radio signals that include the satellite's position and the precise time the signal was sent. Your GPS receiver picks up signals from at least four satellites simultaneously and calculates how long each signal took to arrive. Since radio signals travel at the speed of light, the receiver can determine its distance from each satellite. This process is called trilateration. With distances from three satellites, the receiver can narrow your position to a specific point in three-dimensional space, and the fourth satellite corrects for timing errors in the receiver's clock. The intersection of these distance measurements pinpoints your location to within a few meters anywhere on Earth.