One invention that has revolutionized the way we get around is the device known as satellite navigation. It uses a network of satellites known as the Global Positioning System, or GPS for short. The network consists of 24 Navstar satellites that were deployed by the U.S. Air Force. The GPS uses signals to determine our position on the earth, and it can give us directions to take in order to reach our destination. It has made traditional maps obsolete.
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