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Steven Johnston's Articles Display Category|Title|Newest|Oldest GPS: How Does It Work? The Global Positioning System is a satellite-based navigation system put into place by the U.S. Department of Defense and is a network made up of 24 satellites in orbit around the earth. The satellites orbit the earth at about 12,000 miles, are solar powered, they transmit a signal of only 50 watts, and travel at speeds of about 7000 miles per hour. The GPS system was originally intended for military use only, but during the 1980s the government decided to allow civilian use....	Authors Sign Up for a free account. Submit your articles. Publishers Category RSS feeds. Resources Accredited Home Schools Article Directory More Resources

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