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The GPS Program Office (GPS Wing) —Responsible for designing and acquiring the system on behalf of the United States Government.

U.S. Army Corps of Engineers manual: NAVSTAR HTML and PDF (22.6 MB, 328 pages)

National Geodetic Survey Orbits for the Global Positioning System satellites in the Global Navigation Satellite System

GPS PPS Performance Standard —The official Precise Positioning Service specification

GPS and GLONASS Simulation (Java applet) Simulation and graphical depiction of space vehicle motion including computation of dilution of precision (DOP)