[http://fr.wikipedia.org/wiki/Global_Positioning_System]
[http://en.wikipedia.org/wiki/Galileo_(satellite_navigation)]
[http://en.wikipedia.org/wiki/Global_Positioning_System]
[http://en.wikipedia.org/wiki/GLONASS]
[http://en.wikipedia.org/wiki/Beidou_navigation_system]
[http://en.wikipedia.org/wiki/Indian_Regional_Navigational_Satellite_System]
[http://www.esa.int/esaNA/GGG63950NDC_egnos_0.html]
[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/]
[http://www.navcen.uscg.gov/]
[http://cgls.uscg.mil/mailman/listinfo/gps]
[http://cgls.uscg.mil/mailman/listinfo/nanu]
Constellation of positionning satellites GALILEO GPS GLONASS BEIDOU INRSS Satellite-based systems for improved precision EGNOS WAAS To find out the current status of the GPS constellation The U.S. Coast Guards website provides information directly from the U.S. Department of Defense (DOD). Temporary deactivations of satellites are indicated on the pages "Status" and "NANU"
Positioning satellites in use or planned
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