Service (EGNOS) Galileo positioning system Global Positioning System GLONASS BeiDou NavIC NTRIP References External links RTK Detailed Concepts GNSS, RTK and Satellite Positioning concepts in depth. CORS Map Global Network of Continuously Operating Reference Stations. GBAS Map Global Map Coverage of Ground Based Augmentation Reference Beacons (GBAS). Guidelines User Guidelines for Single Base Real Time GNSS Positioning (NOAA) RTK Integration Manual to integrate RTK Receivers into UAVs and Robotics History of RTK An article by people involved in the early days of RTK Geomatics engineering Global Positioning System Kinematic Wireless locating