GPS: What is it and how does it work? | Space
A short history of GPS development > Schriever Space Force Base (Archived) > Article Display
ULA Atlas V succesfully deploys new GPS satellite - NASASpaceFlight.com
Top Suppliers of Global Positioning Systems (GPS) in the US and Canada
USA-213 - Wikipedia
Adios GPS! US Air Force Could Eventually Dump 'Vulnerable' GPS For NTS-3 As Russia, China Wield Laser, EW Prowess
Brief History of GPS | The Aerospace Corporation
Global Positioning System | NASA
GPS | Definition, Types, Uses, & Facts | Britannica
Spaceflight Now | Delta Launch Report | Shepherding a new era of GPS satellites to orbit
China's Rival to GPS Navigation Carries Big Risks
USA: NOAA satellites help us prepare for severe weather | PreventionWeb
USA-203 - Wikipedia
USA-309 - Wikipedia
Brief History of GPS | The Aerospace Corporation
What Is GPS & How do Global Positioning Systems Work? | Geotab
Global Positioning System - Wikipedia
China's satellite navigation technology is challenging U.S. GPS
What on Earth is the Global Positioning System? > U.S. Department of Defense > Story
GPS III/IIIF | Lockheed Martin
GPS-2 (Navstar-2) - Gunter's Space Page
America advances GPS with new satellites | ShareAmerica
