Feb. 14, 1989: GPS Enters Orbit | WIRED
GPS.gov: Space Segment
GPS-3 (Navstar-3) - Gunter's Space Page
Satellite Navigation - GPS - How It Works | Federal Aviation Administration
Boeing, Air Force, pen agreement to oversee GPS 2 for next five years - SpaceNews
GPS | Definition, Types, Uses, & Facts | Britannica
Triangulation | National Geographic Society
GPS Satellites | Lockheed Martin
DARPA to re-invent GPS navigation without the use of satellites - ExtremeTech
The Global Positioning System: Global Positioning Tutorial
Global Positioning System Satellite Achieves 20 Years On-Orbit > Los Angeles Air Force Base > Article Display
How Does GPS Work? | NASA Space Place – NASA Science for Kids
Newest GPS satellite goes active – Spaceflight Now
How Does GPS Work? | NASA Space Place – NASA Science for Kids
GPS Satellites | Lockheed Martin
9,994 Gps Satellite Stock Photos, Pictures & Royalty-Free Images - iStock
What Is GPS? Fleet Management Experts Answer | Geotab
Global Positioning System > United States Space Force > Fact Sheets
Scientists create their own GPS by spying on internet satellites | Science | AAAS
How Does GPS Work? | Time and Navigation
GPS III Launch Will Provide Global M-Code - Breaking Defense
What is GPS? | NASA
Satellite Navigation - Global Positioning System (GPS) | Federal Aviation Administration
GPS Block III: a new generation of GPS satellites now included in the EGNOS solution | EGNOS User Support
GPS satellite networks are easy targets for hackers
Global Positioning System > United States Space Force > Fact Sheets
