Handheld GPS Tracking
Never Get Lost Again
The Precision of GPS
A typical hand-held GPS receiver calculates position by using the signals from at least four or more Satellites. In order to work properly, four satellites are needed to insure a very accurate local time and position. In other words, the hand-held GPS uses four measurements to solve for four variables: x, y, z, and t.
Every satellite sends signals that travel at the speed of light through outer space, and slightly slower through the atmosphere. The hand-held device then uses the arrival time of the signal to compute the distance to each satellite, from which it determines the position of the receiver using geometry and trigonometry.
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