NGA GPS Division - http://earth-info.nga.mil/GandG/sathtml/index.html
NGA Precise Ephemeris (Antenna Phase Center based or SV Center of Mass based are available) and daily NGA EOPP bulletins are posted and available at this website.
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Air Force Space Command - http://www.afspc.af.mil/
General information about Air Force Space Command, missions and roles.
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GPS Operations Center - Constellation Operations - https://gps.afspc.af.mil/gps/
Advisories to NAVSTAR Users (NANUs), Almanacs, and Operational Advisories
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International GNSS Service (IGS) - http://igscb.jpl.nasa.gov/
Formerly the International GPS Service, IGS is a voluntary federation of more than 200 worldwide agencies that pool resources and permanent GPS & GLONASS station data to generate precise GPS & GLONASS products.
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National Geospatial-Intelligence Agency
- https://www.nga.mil/Pages/Default.aspx
NGA provides timely, relevant, and accurate imagery, imagery intelligence, and geospatial information in support of national security objectives.
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NAVSTAR GPS Joint Program Office
- https://gps.losangeles.af.mil
Status of GPS development and issues related to user equipment, and the control and space segments.
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Space Weather Prediction Center (SWPC) - NOAA
- http://www.swpc.noaa.gov/
Information on space environmental effects affecting GPS, including the Earth's magnetic field, auroral zone effects, and solar energy particles. Includes forecasts of Solar and Geophysical activity.
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US Strategic Command (USSTRATCOM)
- https://www.stratcom.mil/
General information about US Strategic Command, missions and roles.
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USCG Navigation Center (NAVCEN) - http://www.navcen.uscg.gov
Information of interest to civil users of GPS, including notices, advisories, notices of meetings, and technical documentation.
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