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Global Positioning System - Wikipedia
GPS.gov: GPS Overview - GPS: The Global Positioning System
GPS - National Geographic Society
GPS: The Global Positioning System
GPS - NASA
GPS: What is it and how does it work? | Space
How Does GPS Work? | NASA Space Place – NASA Science for Kids
GPS | Definition, Types, Uses, & Facts | Britannica
GPS.gov: Space Segment - GPS: The Global Positioning System
Principles of the Global Positioning System, Lecture 1 - MIT OpenCourseWare