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NAVSTAR GPS is a really famous navigation facilities that are applied by a great number of people nowadays. This system gives a possibility to define the location and speed of the objects at any area on Earth, including polar areas, almost in all weather conditions, and in space to 100 kilometers above Earth. The developer of Global Positioning System became the United States Department of Defense that has realized this system.

The main principle of functioning is identifying of the location by the method of measuring the distance to an object from the point with definite coordinates. The transmitting satellite spreads radio signal to a GPS antenna and the delay time is counted to detect the distance between the receiver and transmitter. 3-D coordinates may be detected when GPS receiver will recognize the distance to 3 satellites and the time of the Global Positioning System. As a result, radio signals from 4 satellites minimum are applied for the definition of GPS receiver's coordinates and altitude. The direction of the satellites from Earth is realized in the control station that is situated in Schriever base, Colorado.

Today GPS receivers are frequently applied for civil purposes, mostly for position and velocity detection. Handheld GPS systems are being sold in different shops and they are built in mobile phones, PCs and onboarders. With a GPS receiver a consumer may indicate his geographical coordinates at the definite period of time. The maximum precision is from three to five meters and with the correction signal from Earth it is to one millimeter.

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