• GPS Receiver Information, Software, and Hardware Reviews of Garmin, Lowrance, Magellan and other GPS Receivers
  • Joe Mehaffey and Jack Yeazel's GPS Information
  • The Institute of Navigaton
  • Navstar GPS Resources
  • Telson Communications, Inc.
  • Trimble: The GPS Solution
  • U.S. GPS Industry Council Proposal Threatens GPS Spectrum; Risks to Public Safety
  • DeLorme Mapping
  • Digital Cartography
  • GeoWeb For GIS/GPS/RS
  • GPS Receiver Main Catalog
  • Introduction to GPS Applications
  • NMEA - National Marine Electronics Association
  • MARINESOFT
  • NMEA-0183 and GPS Information
  • XMIDAS NMEA-0183 SENTENCE FORMATTERS
  • GPS - General Information Site
  • The GPS Resource Library

  • GPS World
  • GPS Precise Orbits

  • NAWCWPNS - Interactive GPS Satellite Prediction Utility
  • NAWCWPNS - GPS/INS Section NAVAL AIR WARFARE CENTER WEAPONS DIVISION

  • U.S. Census TIGER Mapping Service
  • USGS National Mapping Information
  • U.S. Geological Survey
  • USGS Digital Raster Graphics
  • Navigation Technologies
  • Navtech Seminars and GPS Supply
  • Chicago Map Products
  • Sam's GPS raw data pages
  • KALLISTO
  • Find Rise and Set Times for the Sun and Moon
  • Global Positioning System Overview
  • Trimble's How GPS works
  • Clock Software
  • Jim Bixby's DGPS Receiver Project
  • Jim Bixby's DGPS Receiver Project directory
  • CSI - DGPS Beacon Locations