How GPS determines your position?
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A GPS receiver simply measures the travel time of the signals transmitted from the satellites, then multiplies them by the speed of light to determine exactly how far the unit is from every satellite it’s sampling. By locking onto the signals from a minimum of three different satellites, the GPS receiver can calculate a 2D (two-dimensional) positional fix, consisting of your latitude and longitude. Looking onto a fourth satellite allows the GPS receiver to calculate a 3D (three-dimensional) fix, calculating your altitude as well as your latitude/longitude position.