The Department of Defense launched 24 satellites into orbit, and using signals from these satellites, a GPS receiver can calculate such information as altitude, longitude, and latitude. A GPS receiver needs to be in the view of at least three of these satellites to provide accurate data. Depending on the location of the GPS receiver, precision can be down to a few feet. The ideal conditions for GPS are a large open space with a direct view of the sky. Unfortunately, the signal is less than optimal in a city with tall skyscrapers that obstruct the view of the GPS receiver. For a more in-depth explanation of GPS, visit .
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