1973 United States begins GPS program 1978 First experimental GPS Block I satellite launched 1983 President Reagan issues directive making GPS available for civilian use 1989 First modern GPS Block II satellite 1991 launched GPS used for first time militarily in Gulf War 1995 GPS constellation expands to 24 satellites, becomes fully operational 2004 Successful tests performed for adding GPS to mobile phones 1996 President Clinton issues directive to stop degrading civilian signal 2016 Last of 12 Boeing Block IIF satellites launched
Frontiers March 2016 Issue
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