System Information

System Description, General Information on GNSS

An overview of different GNSS provided by wikipedia:

System overview and chronology provided by Encyclopedia Astronautica:

Continuative information and deeper insight may be found on the following pages:

GPS	National Space-Based PNT Executive Commitee GPS homepage by the National Space-Based PNT Executive Commitee Global Positioning System Operations Center (GPSOC) Global Positioning Systems Wing (GPSW) General Information on GPS by U.S. Coast Guard Navigation Center GPS Overview by U.S. Naval Observatory
GLONASS	GLONASS homepage by the Russian Space Agency
Galileo	Galileo homepage by ESA Galileo Joint Undertaking Gelileo Information Center Galileo News Galileo Description by the Directorate - Energy and Transport, European Commission
WAAS	The WAAS FAQ by Federal Aviation Administration (FAA) WAAS by FAA, National Airspace System Architecture
EGNOS	EGNOS homepage by ESA EGNOS Operations User Support EGNOS for Professionals

GPS	Constellation and Satellite Status from USNO Active Notice Advisory to NAVSTAR Users (NANU)
GLONASS	Constellation and Satellite Status from the Russian Space Agency Notice Advisory to GLONASS Users (NAGU)
Galileo	Constellation and Satellite Description from ESA

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