English subtitles for clip: File:AFSC Film, NAVSTAR GPS-Circa 1977.ogv

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The NAVSTAR Global Positioning System will be a worldwide network of satellites transmitting precise, jam-resistant navigational signals.

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These signals are deciphered by special receivers to determine longitude, latitude, altitude, speed and time.

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24 satellites will orbit the Earth every 12 hours to provide highly accurate and continuous global coverage,

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to the Army, Marines, Air Force and the Navy.

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With this system a ship could determine its position on any ocean in the world within 30 feet;

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a tank unit could accurately determine local time for a coordinated attack.

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Additional applications include precise weapons delivery during inclement weather,

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improved approaches in poor visibility,

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accurate aerial refuelling rendezvous,

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and more efficient search and rescue operations.

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Monitor stations around the world would continually gather satellite signals.

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During the 1980s the NAVSTAR system will provide an accurate, cost-effective global positioning system.