Feb. 14, 1989: GPS Enters Orbit

1989: The first of 24 satellites that will make up the global positioning system is put into orbit.
GPS revolutionized navigation, both at sea and on land, by providing position reports with unprecedented, pinpoint accuracy. Each satellite is placed in a specific orbit at a specific altitude to ensure that four or five satellites are always [...]

Source: http://www.wired.com/thisdayintech/2011/02/0214gps-satellite-launched/

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