Why are the GPS constellation satellites in such a high orbit? - Space Exploration Stack Exchange
Geostationary Satellite - an overview | ScienceDirect Topics
The Sky's The Limit - The Global Positioning System (GPS)101 <<Safer,Smarter,Confident Pilots>> #SmartPilotLikeToLearn The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States ...
High Earth orbit - Wikipedia
The Global Positioning System: Global Positioning Tutorial