Global Positioning System
(In some places call: Global Positioning Satellite)
or Castilian: Global Positioning System.

Above our heads (about 20,000 km) there are 24 satellites orbiting the earth, each of these carry an atomic clock and are mutually synchronized.
Using Radio Frequency , they emit a signal to the world (heh, sounds crazy, but is literal, "everyone"), something like a ping (" broadcasteado "), the GPS receivers are as the Garmin , other brands, and my beloved Nokia N95 , only receive satellite signals that are "visible" (clear sky), with 4 satellites and can begin to calculate the location.

Navstar, one of the satellites

As you do this?
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