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They made the GPS for soldiers to find their way at war.

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The GPS has to find where the satellite is and it calculates how far away the GPS is away from the satellite.

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A GPS needs an atomic clock so each satellite has one the GPS has a quartz clock to make GPS affordable.

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Brain, Marshall. How Stuff Works: How the Global Position System Works. , 2008. sirsdiscoverer, https://explore.proquest.com/sirsdiscoverer/document/2265442817?accountid=38270.
GPS Satellite. ProQuest, Ann Arbor, 2017. sirsdiscoverer, https://explore.proquest.com/sirsdiscoverer/document/2255965967?accountid=38270.
Man using GPS Device. ProQuest, Ann Arbor, 2010. sirsdiscoverer, https://explore.proquest.com/sirsdiscoverer/document/2256440928?accountid=38270.

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You but in where you want to go and that information is sent to a satellite and the satellite finds where you are a sends directions back.