Europe's GPS alternative has been offline since Friday - The Verge
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Global Positioning System
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AFSPC Milestone: First Block II GPS satellite launched > Air Force Space Command (Archived) > Article Display
The Sky's The Limit - The Global Positioning System (GPS)101 <<Safer,Smarter,Confident Pilots>> #SmartPilotLikeToLearn The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States ...
Boeing, Air Force, pen agreement to oversee GPS 2 for next five years - SpaceNews
Lockheed Martin to upgrade GPS satellites for in-orbit servicing - SpaceNews
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What is GPS?
Benefits coming from GPS III constellation - GPS World