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Artifact
This unit was designed for navigating vehicles on land using Transit satellite transmissions and a magentic compass and monitoring the speed of movement.
Photograph
GPS and other satellite positioning systems were designed to use quiet parts of the spectrum.
Artifact
The Motorola LGT 1000 was used for better accuracy by scientists.
Artifact
In the 1990s, the NIST-7 was the most accurate clock in the country and helped keep the GPS clocks synchronized.
Artifact
The Astroinertial Navigation System provided rapid celestial navigation fixes for the SR-71.
Photograph
Engineers discussing the Global Positioning System.
Illustration
All three (positioning, navigation, and timing) are used together with map data and other information (weather or traffic data, for instance) in modern navigation systems.
Artifact
The PLGR was smaller and lighter than the older Manpack GPS receiver.
Artifact
The Manpack was one of the first portable GPS receivers for combat troops.
Photograph
A corn and soybean farmer from Rippey, Iowa.
