Sources of GPS Constellation Status and Other Information
U.S. Coast Guard Navigation
Information Service. This site provides user advisories, GPS constellation status and other user information.
http://www.navcen.uscg.mil
University of New Brunswick
. This site provides GPS constellation status and ionospheric disturbance warnings.
/http://gauss.gge.unb.ca/CANSPACE.html
U.S. National Geodetic Survey
. This site provides precise tracking data.
http://www.ngs.noaa.gov/orbits
Scripps
Orbit and Permanent Array Center. Provides orbit data.
http://lox.ucsd.edu
US Naval Observatory
. Timing and status data.
http://tycho.usno.navy.mil/gps.html
ION GNSS
Conference
http://www.ion.org
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Yuma Alm.
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Time Util.
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Exp. Witness
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Product Evaluation
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