FCC approves use of Galileo in the U.S.
GLONASS company to build 27 more satellites - GPS World
How many satellites are operating in space? | World Economic Forum
GPS-2A (Navstar-2A) - Gunter's Space Page
What Material Will Block GPS Signals?
ESA - Galileo satellites
5.2 Global Positioning Systems | GEOG 160: Mapping our Changing World
SpaceX's Starlink broadband satellites could be used for GPS navigation | Space
L3Harris delivers experimental navigation satellite
GPS.gov: Image Library
An FCC rule change allows US residents to navigate with Galileo instead of GPS | TechSpot
Inside China's $9Bn Space Plan to Challenge American GPS | 2018-11-27 | SupplyChainBrain
GPS.gov: Space Segment
Feb. 14, 1989: GPS Enters Orbit | WIRED
GPS Block III - Wikipedia
USA-213 - Wikipedia
GPS? With Starlink, We Don't Need It Any More! | Hackaday
Air Force launches final GPS II satellite
GPS.gov: Image Library
GPS Anti-Jam M-Code Takes Two Steps Forward - Breaking Defense
Technology in Focus: GNSS Receivers | Hydro International
GPS Space Segment - Navipedia
What Causes GPS Signal Loss on Satellites like Swarm? - Eos
DARPA to re-invent GPS navigation without the use of satellites | Extremetech
GPS Block III: a new generation of GPS satellites now included in the EGNOS solution | EGNOS User Support
Cosmic GPS - Aerospace America
