• Kai Borre
• Manuel Hernandez-Pajares
• CDDIS Analysis Center
• International Federation of Surveyors
• The Precise Point Positioning Software Centre
• The NASA Global Differential GPS
• Nordic Institute of Navigation
• Swiss Institute of Navigation ION-CH
• GPS Toolbox
• Michael R. Craymer
• GPSLab, Stanford University
• Global Positioning System: Signals, Measurements, and Performance
• GPS Raw Data Pages
• TEQC - The Toolkit for GPS/GLONASS/Galileo/SBAS Data
• Deflt, The Netherlands
• GPS Precise Analysis Software GpsTools (Japan)
• Laboratorio di Geomatica Politecnico di Milano - Polo Regionale di Como
• CNES/CLS Analysis Center
• NavLab - Illinois Institute of Technology
• International Society for Photogrammetry and Remote Sensing
• Research Group of Astronomy and Geomatics gAGE/UPC
• Canadian Institute of Geomatics
• Advanced Surveying
• The International Committee on Global Navigation Satellite Systems
• Civik 235: Plane Surveying
• ESA: Learning EGNOS
• MIT-12.540 Principles of the Global Positioning System
• Jakob Jakobsen
• Active Tectonics Group, Department of Geology, UC Davis
• Toolbox of Research
• Juniper GIS
• Information skills
• The Basic Elements of English