GLOBAL POSITIONING SYSTEM | WHAT IS GPS

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The Global positioning system (GPS) is a network of 24 navigation satellites orbiting the Earth that people can use to pinpoint their position. The satellites orbit at a height of 20000 kilometer. A GPS receiver picks up signals from any of these satellites that are above the horizon. It uses information in each signal to work out how far away it is from satellites. it can calculate its position on the earth's surface when it has information from atleast three satellites.

A basic GPS receiver shows the latitude and longitude of its position on its screen. More advanced receivers, especially those designed for use in vehicles, show their position on a digital map. These recevers often show extra  information, such as the vehicle's speed and the length of the journey. Some receivers warn drivers if they exceed the speed limit for a road and even tell drivers which traffic lane to use at next junction. Directions are shown on the screen and also spoken by a synthesized voice.



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