Introduction to GPS: The Global Positioning System

Canadian Active Control System (CACS data and service):
http://www.geod.nrcan.gc.ca/htmlpublic/GSDproducts Guide/CACS/English/cacstest.html
Geodetic Survey Division of Geomatics Canada:
http://www.geod.nrcan.gc.ca/index_English_text_based.html
Galileo EC page:
http://www.Galileo-pgm.org/
Galileo World magazine:
http://www.galileosworld.com/
GPS World magazine:
http://www.gpsworld.com/
International GPS Service for Geodynamics (RINEX and precise ephemeris data):
http://igscb.jpl.nasa.gov/
International Terrestrial Reference Frame (ITRF):
http://large.ensg.ign.fr/ITRF/index-old.html
Ministry of Defence of the Russian Federation (GLONASS Web page):
http://www.rssi.ru/SFCSIC/English.html
National Imagery and Mapping Agency (NIMA):
http://164.214.2.59/nimahome.html
Navtech Seminars and GPS Supply:
http://www.navtechgps.com/
UNB Internet resources:
http://gauss.gge.unb.ca/GPS.INTERNET.SERVICES.HTML
University Navstar Consortium (UNAVCO data and service):
http://www.unavco.ucar.edu/
U.S. Coast Guard Navigation Center (GPS NANU, GPS Almanac, FRP, and others):
http://www.navcen.uscg.gov/
U.S. Continuously Operating Reference Station (CORS data):
http://www.ngs.noaa.gov/CORS
U.S. National Geodetic Survey:
http://www.ngs.noaa.gov/index.shtml
U.S. National Geodetic Survey GEOID page:
http://www.ngs.noaa.gov/GEOID
U.S. National Geodetic Survey Orbit data:
http://www.ngs.noaa.gov/GPS/GPS.html
U.S. Naval Observatory (GPS timing data and information):
http://tycho.usno.navy.mil/gps_datafiles.html
Applanix Corporation (integrated systems):
http://www.applanix.com/
Integrinautics (pseudolites):
http://www.integrinautics.com/
Leica:
http://www.leica.com/
Magellan Corporation (Ashtech precision products):
http://www.ashtech.com/
NovAtel:
http://www.novatel.ca
Pacific Crest Corporation (radio link systems):
http://www.paccrst.com/
SOKKIA Corporation:
http://www.sokkia.com/
Trimble Navigation:
http://www.trimble.com/