Every global navigation satellite system includes some kind of contact point to the user community. In the case of the Global Positioning System (GPS), the official information is accessible from the web www.gps.gov, where general information of the system is provided to all users by the US National Coordination Office for Space-Based Positioning, Navigation, and Timing. The GPS status and outage reports are provided by three administrations, usually referred to as the GPS TRIAD: the USAF GPS Operations Centre (USAF GPSOC) for military users, the FAA National Operations Control Centre (FAA NOCC) for airspace users and, finally, the U.S. Coast Guard Navigation Centre (USCG NAVCEN) for other civilian users. The official information about the GLObal NAvigation Satellite System (GLONASS) from the Russian Federal Space Agency is currently accessible from the web domain glonass-iac.ru/en. Finally, the official information about the BeiDou Satellite Navigation System (BDS), also known as COMPASS, from China National Space Administration is currently accessible from the web domain en.beidou.gov.cn.
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