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  2. The US Department of Defense started the GPS project in 1973 and its full constellation of 24 satellites became operational in 1993, first for military use and three years later for civilian use as well.
    www.bbvaopenmind.com/en/technology/visionaries…
    The first prototype spacecraft was launched in 1978 and the full constellation of 24 satellites became operational in 1993. Originally limited to use by the United States military, civilian use was allowed from the 1980s following an executive order from President Ronald Reagan after the Korean Air Lines Flight 007 disaster.
    en.wikipedia.org/wiki/Global_Positioning_System
     
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    When did GPs become operational?The 24 satellite system became fully operational in 1993. Today, GPS is a multi-use, space-based radio-navigation system owned by the US Government and operated by the United States Air Force to meet national defense, homeland security, civil, commercial, and scientific needs.
    nasa.gov
    When was the first GPS device invented?1985 — The U.S. government opens contracts with private companies to create portable GPS receivers. 1989 — GPS company, Magellan, introduces the first hand-held GPS device, the NAV 1000. The first fully operational satellite is launched by the U.S. Air Force as a part of their Block II program. 1990-1999:
    When did GPs become a satellite?The full 24-satellite constellation was completed on March 9, 1994. GPS receivers use triangulation of the GPS satellites' navigational signals to determine their location. The satellites provide two different signals that provide different accuracies. Coarse-acquisition (C/A) code is intended for civilian use, and is deliberately degraded.
    When did the GPS system become secret?Front page of the seminal GPS system study performed from 1964 to 1966 by USAF 621B Program. Originally classified secret, it was not declassified until after the initial GPS satellite had been launched. This was the essential foundation to the GPS System design.
     
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    As of 15 August 2023 , 83 Global Positioning System navigation satellites have been built: 31 are launched and operational, 4 are unhealthy or in reserve, 41 are retired, 2 were lost during launch, and 1 prototype was never launched. 4 Block III satellites have completed construction and have beenSee more

     
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