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From Navipedia

GALILEO

• ESA's Galileo webpage

• EC's Galileo webpage

• Europe's Satellite Navigation Systems

GPS

• Official U.S. Government's GPS webpage

• GPS Directorate LA AFB

GLONASS

• GLONASS Information Analytical Centre official website

• Russian Space Systems GLONASS' website

COMPASS

• COMPASS Official Website (in Chinese)

• COMPASS' ICD

EGNOS

• ESA's EGNOS webpage

• EGNOS' Portal

• ESSP's EGNOS webpage

• EC's EGNOS webpage

WAAS

• FAA's WAAS/GPS webpage

• William J. Hughes Technical Center WAAS Test Team

MSAS

• Japan's MLIT Aeronautical Satellite Systems

• MTSAT eoPortal's webpage

• Meteorological Satellite Center of Japan - MTSAT Status

QZSS

• JAXA's Quasi Zenith Satellite-1 MICHIBIKI

GAGAN

• ISRO's GAGAN official webpage

Other SATNAV-related links

• European GNSS Agency (GSA) webpage

• UNOOSA-ICG

• International GNSS Service (IGS)

• International Association of Institutes of Navigation (IAIN)

• International Telecommunication Union (ITU)

RES-609 Forum

ITU-R Recommendations - M series (including RNSS service)

SNL ON-line List of ALL satellite (including RNSS) reference information

• Union Radio-Scientifique Internationale (URSI)

• International Cartographic Association

• International Federation of Surveyors (FIG)

• EC's SatNav

• ESA's Navigation Directorate

• Meetings Civil Global Positioning System Service Interface Committee (CGSIC)

• U.S. National Space-Based Positioning, Navigation, and Timing Executive Committee