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GPS
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GPS satellite
Know how GPS satellites guide airplanes, cars, and even cell phones
Navstar
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For Students
Global Positioning System summary
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Sextant. Celestial navigation at sea. Sailor using sextant. Travel and navigation.
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GPS satellite
GPS satellite U.S. Navstar Global Positioning System (GPS) satellite in orbit over Earth, shown in an artist's conception.

GPS

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Articles from Britannica Encyclopedias for elementary and high school students.
Also known as: Global Positioning System
Written by
Tom S. Logsdon
Rocket science consultant and instructor. Author of Understanding the Navstar: GPS, GIS, and IVHS and Orbital Mechanics: Theory and Applications among others.
Tom S. Logsdon
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Article History
In full:
Global Positioning System
Key People:
Gladys West

GPS, space-based radio-navigation system that broadcasts highly accurate navigation pulses to users on or near Earth. In the United States’ Navstar GPS, 24 main satellites in 6 orbits circle Earth every 12 hours. In addition, Russia maintains a constellation called GLONASS (Global Navigation Satellite System), and in 2007 the European Union approved financing for the launch of 30 satellites to form its own version of GPS, known as Galileo, which began operations in 2016. China launched two satellites in 2000 and another in 2003 as part of a local navigation system first known as BeiDou (“Big Dipper”). In 2006 China, ...(100 of 1654 words)

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