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Why GPS Is Under Attack - The New York Times
GPS: Technology That Truly Changed The World - Forbes
Global Positioning System - The New York Times
News Items - GPS: The Global Positioning System
The race to back up vulnerable GPS - SpaceNews
Boeing wins $329 million contract to support orbiting GPS satellites
GPS - NASA
Could the world cope if GPS stopped working? - BBC
Lockheed wins USAF GPS III satellite follow-on production contract
Global Positioning System - Page 2 - The New York Times