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Global Positioning System (GPS) What is GPS? The Global Positioning System is a network of 31 satellites, also known as Navigation System With Time And Ranging (NAVSTAR), orbiting the Earth about 12,000 miles above us. 24 of these satellites are active and the other 7 are spare in case one of the active satellites fails. The satellites orbit the Earth just over 2 times per day and travel at speeds of roughly 7,000 miles per hour. They were placed into orbit by the United States Department Of Defense. They are designed to show the position of a DGPS receiver. They were originally intended for use in the military but, in the 1980's, is was made available for civilian use. Each of the satellites is designed to last about 7.5 years. The satellites are powered by solar energy. Who uses GPS? GPS has a lot of different uses. It is a very popular tool for...

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