Congratulations GPS – Happy 20th Anniversary!

GPS IFF satelliteHappy Anniversary GPS!

Today – July 17th, marks the 20th anniversary of the official start of  global positioning system GPS declared fully operational by the United States Air Force – Read more on this at Denver Post Article. 

By | 2017-11-07T23:47:23+00:00 July 17th, 2015|Survey|0 Comments

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