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Why GPS Is Under Attack - The New York Times
U.S. eyes geostationary orbit for next-gen GPS - SpaceNews
GPS: Technology That Truly Changed The World - Forbes
News Items - GPS: The Global Positioning System
The race to back up vulnerable GPS - SpaceNews
Global Positioning System - The New York Times
Boeing wins $329 million contract to support orbiting GPS satellites
Hyper-accurate positioning is rolling out worldwide
GPS - NASA
How the US lost its way on making a GPS backup - NPR
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