The U.S. Global Positioning System (GPS) satellite fleet made up 34% of the operational global positioning, navigation, and timing fleets orbiting the Earth in 2015. Originally developed for military use, GPS became fully operational in the spring of 1995, marking 2015 as the 20th anniversary for th...
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The Authoritative Guide to Global Space Activity, Packed with Over a Decade of Data, Resources, and Information.
