Australian Surveying and Land Information Group (AUSLIG)

http://www.auslig.gov.au/geodesy/geodesy.htm

Federal Geodetic Control Subcommittee

http://www.ngs.noaa.gov/FGCS/fgcs.html

Geodetic Survey of Canada

http://www.geod.emr.ca

German Institute for Applied Geodesy

http://www.potsdam.ifag.de/english/info/ifag-geodaesie-e.html

Goddard Space Flight Center Crustal Dynamics data information.

http://cddis.gsfc.nasa.gov/cddis_welcome.html

http://www.inmet.com/~pwt/gps_gen.html

Institute of Navigation

http://www.ion.org

ITS (Intelligent Transportation Systems) Online

http://www.itsonline.com  

International GPS Service for Geodynamics

http://igscb.jpl.nasa.gov

Peter Dana Overview of GPS

http://wwwhost.cc.utexas.edu/ftp/pub/grg/gcraft/notes/gps/gps.html

Southern California Integrated GPS Network

http://milhouse.jpl.nasa.gov

U.S. Department of Transportation

http://www.dot.gov

U.S. National Earth Orientation Service

http://maia.usno.navy.mil

University NAVSTAR Consortium

http://www.unavco.ucar.edu

Commercial Vendors

Best-Fit Computing

http://www.teleport.com/~bestfit

Communication systems International Inc

http://www.csi-dgps.com

Differential Corrections Inc. (DCI)

http://www.dgps.com

Etak, Inc.

http://www.etak.com

Navtech Seminars & GPS Store

http://www.navtechgps.com

Omnistar Inc.

http://www.omnistar.com

Starlink Incorporated http://www.starlinkdgps.com