Beskrivning : The first eleven spacecraft (GPS Block 1) were used to demonstrate the feasibility of the GPS system.
Global Positioning System (GPS) was developed by the US Department of Defense to provide all-weather round-the-clock navigation capabilities for military ground, sea, and air forces. Since its implementation, GPS has also become an integral asset in numerous civilian applications and industries around the globe, including recreational used (e.g., boating, aircraft, hiking), corporate vehicle fleet tracking, and surveying.
Vandenberg post stamp and leaving of satellite Navstar 3.

USA 1189 - image retouchée ?

Sida : future · Ref: USA 1189 

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NAVSTAR 3 (GPS 3) (SATELLITE) · ATLAS F