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Global Positioning System - Wikipedia
GPS: The Global Positioning System
What Is GPS and How Does It Work? - Lifewire
GPS | Definition, Types, Uses, & Facts | Britannica
GPS.gov: GPS Overview - GPS: The Global Positioning System
GPS: What is it and how does it work? | Space
Google Maps - Apps on Google Play
GPS.gov: GPS Accuracy - GPS: The Global Positioning System
How Does GPS Work? | NASA Space Place – NASA Science for Kids