Stands for "Global Positioning System." GPS is a satellite navigation system used to determine ground position and velocity (location, speed, and direction). Though it was created and originally used by the U.S. military, GPS is now available to the general public all over the world. GPS navigation systems are currently installed in a number of luxury cars, complete with an LCD map that shows the driver exactly where in the world he is. Advanced car GPS units can actually speak the directions to a certain destination and tell the driver when to turn. Cool, huh?

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Definition from the PC Glossary