GALILEO
- Features overview of the GALILEO global satellite navigation system by the European Commission. Includes functions, performances and utilization areas.
- http://ec.europa.eu/dgs/energy_transport/galileo/index_en.htm

National Space-Based Positioning, Navigation, and Timing (PNT)
- Provides news and facts from the U.S. government board that manages the Global Position System (GPS).
- http://pnt.gov/

The European Space Agency: Satellite Navigation
- Includes overview of satellite navigation and presentation of the European satellite navigation systems Galileo and EGNOS.
- http://www.esa.int/esaNA/index.html

NAVSTAR GPS Joint Program Office
- United States joint-military-service, multi-national organization responsible for the global positioning constellation, operational control segment, and user equipment. Technical and programmatic information.
- http://gps.losangeles.af.mil/

iNavSat
- News and background information by a consortium set up to operate the Galileo satellite navigation system.
- http://www.inavsat.com/

GPS World
- Magazine offering on-line news and updated reference information in space and ground GNSS systems.
- http://www.gpsworld.com/gpsworld/

China-Europe GNSS
- Provides information on the Chinese cooperation in European global navigation space systems.
- http://www.cenc.org.cn/en/

Galileo Joint Undertaking
- Offers general system information and industry related material by the consortium building the system.
- http://www.galileoju.com/

Global Positioning System
- Provides overview of the GPS program and launches.
- http://leonardo.jpl.nasa.gov/msl/Programs/gps.html