8.1 Basic Principle of Satellite Navigation8.2 The Constellation of Space Vehicles (SVs)8.3 Transmissions by the GPS SVs8.4 Control Segment8.5 Sources of GPS Errors8.6 Relativity Corrections Required for GPS8.7 Augmentation Systems8.8 GPS Cockpit Instrumentation8.9 Spoofing, Meaconing, and Positioning, Navigation, and Timing (PNT) ResilienceProblemsReferences