December 2004
Space Tracker
The earliest satellite watchers' ideas led to GPS.
By Dan Cho
Over the past decade or so, the Global Positioning System has grown from a military navigation tool to a near ubiquitous tracking system. Biologists use it to follow migrating animals, while motorists depend on it to avoid getting lost on highways. But while the system's wide availability has sparked an explosion in innovative applications, satellite navigation itself can be traced back to the first satellite in orbit: Sputnik.
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Massachusetts Institute of Technology