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Nasa and the ­.s. Air Force Test a New Ground-Based Gps

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Locata positioning system

Locata's positioning system blankets the White Sands Missile Range; two transmit antennas are shown.

Credit: Locata

Anyone who has struggled to pinpoint his or her location in a mall, airport or urban canyon amid skyscrapers has experienced a GPS gap firsthand.

From Scientific American
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