Receivers have been developed for use in spacecraft, aircraft, ships, land vehicles, and precision-guided munitions, as well as for hand carrying. The signals are so accurate, time can be figured to within a millionth of a second, velocity within a fraction of a mile per hour and location to within 100 feet. With the proper equipment, users can receive at least four satellite signals to calculate time, location and velocity. GPS satellites orbit the earth every 12 hours, emitting continuous navigation signals. The system is operated and controlled by Delta 8, located at Schriever Air Force Base, Colo. The Global Positioning System (GPS) is a constellation of orbiting satellites that provides position, navigation, and timing data to military and civilian users globally.
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