Bye Bye, SA!: The U.S. Department of Defense improves GPS accuracy literally overnight in May 2000.
Manufacturers: A non-exhaustive list of some receiver manufacturers.
NMEA Server: A small but handy tool for distributing navigation data across a TCP/IP network.
Waypoints: In keeping with the small and limited-usefulness theme of the site, a tiny collection of waypoints.
Peter Bennett: Information on GPS units, NMEA (the protocol many GPS units use to communicate with other equipment), mapping software, and marine applications of GPS.
Thomas Born: A site dealing mostly with Garmin units; lots of links to other GPS resources.
Celestrak: Satellite ephemeris data in NORAD two-line format.
Dale DePriest: GPS and Palm Pilot resources.
Global Positioning Systems Wing (GPSW) of the United States Air Force.
Ronald J. van der Kamp: using a Garmin handheld unit for sub-meter accuracy.
Joe Mehaffey & Jack Yeazel: A comprehensive set of reviews, links, and discussion on consumer-grade GPS, mapping software, online dealers, and more. If you're a new GPS user or shopping around for a new handheld unit, this is the place to start your research.
Karen Nakamura: GPS navigation software for Macintosh systems.
NASA Visible Earth: Free satellite and aerial imagery--not quite GPS-related, but interesting nonetheless.
National Geodetic Survey: GPS Toolbox.
National Space-Based Positioning, Navigation, and Timing Executive Committee.
Sam Storm van Leeuwen: OEM GPS receiver hardware information, data processing discussion, and other GPS technical issues.
U.S. Coast Guard Navigation Center: Status information for GPS, DGPS, and other radionavigation systems.
David L. Wilson: GPS accuracy experiments and other technical information.
Sam Wormley: Information on the Global Positioning System (not just the receivers), communications protocol, geography and geodesy, and software.