Resources - from the web
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Geoscience Australia
The AUSPOS on-line GPS data processing service
GNSS Constellations
GPS - Global Positioning System from the USA
GLONASS - GLObalnaya NAvigatsionnaya Sputnikovaya Sistema from Russia
Galileo from the European Union
GNSS Augmentation Systems
WAAS - Wide Area Augmentation System from the USA
EGNOS - European Geostationary Navigation Overlay Service from the European Union
QZSS - Quasi-Zenith Satellite System from Japan
Organisations
IGS - International GNSS Service
IERS - International Earth Rotation and Reference Systems Service
CDDIS - Crustal Dynamics Data Information System, NASA's archive of space geodesy data
Reference
UNAVCO - University NAVSTAR Consortium
navipedia from the European Space Agency