GPS, which stands for Global Positioning System, is a radio navigation system that allows land, sea, and airborne users to determine their exact location, velocity, and time 24 hours a day, in all weather conditions, anywhere in the world. The capabilities of today's system render other well-known navigation and positioning "technologies"-namely the magnetic compass, the sextant, the chronometer, and radio-based devices-impractical and obsolete. GPS is used to support a broad range of military, commercial, and consumer applications.

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