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"Global Positioning System." World of Invention, Gale, 1999. Gale In Context: Middle School, https://link.gale.com/apps/doc/CV1647500364/MSIC?u=mnkkinghs&sid=MSIC&xid=b3db6c0c. Accessed 16 Dec. 2019.

Calandrelli, Emily. “New Air Force Satellites Launched To Improve GPS.” TechCrunch, TechCrunch, 6 Feb. 2016, https://techcrunch.com/2016/02/05/new-air-force-satellites-launched-to-improve-gps/.

“First GPS III Satellite Successfully Launched.” Air Force Materiel Command, 31 Dec. 2018, https://www.afmc.af.mil/News/Article-Display/Article/1722983/first-gps-iii-satellite-successfully-launched/.

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The first time the GPS was used was in the Persian Gulf war in 1991.

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The government controls these satellites, but there are many commercial satellites.

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The GPS works by having 24 satellites around the outside of the world.

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The GPS was made by the military in the 1970's at a cost of about $3billion.