GPS error caused '12 hours of problems' for companies - BBC News
Global Positioning System
Oldest GPS satellite being prepared for disposal > Air Force > Article Display
Newest GPS satellite goes into service – Spaceflight Now
New Air Force Satellites Launched To Improve GPS | TechCrunch
China's version of GPS now has more satellites than US original - Nikkei Asia
The New Flex Power Mode: From GPS IIR-M and IIF Satellites with Extended Coverage Area - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design
Satellite Navigation - GPS - Space Segment | Federal Aviation Administration
The Science Behind the New GPS Satellites | Science Times
How Does GPS Work? | Time and Navigation
GPS Block III: a new generation of GPS satellites now included in the EGNOS solution | EGNOS User Support
GPS 2F-6 Navigation Satellite Slated To Launch on May 15 - SpaceNews
List of GPS satellites - Wikipedia
GPS Provides the Reference for Precision Time & Frequency Products | EndRun Tech
GPS Satellites | Lockheed Martin
GPS.gov: Space Segment
Op-ed | Get the Bullseye Off GPS - SpaceNews
Newest GPS satellite goes active – Spaceflight Now
Satellite Navigation - GPS - How It Works | Federal Aviation Administration
Global Positioning System Satellite Achieves 20 Years On-Orbit > Los Angeles Air Force Base > Article Display
Satellite navigation - Wikipedia
What Is GPS? Fleet Management Experts Answer | Geotab
GPS Satellites | Lockheed Martin
Brief History of GPS | The Aerospace Corporation
