Useful Links
GpsOz GPS Accessories
Excellent custom made cables, GPS antennas, Ozi Explorer .map files and lots of information!
Ozi Explorer
One of the best raster map packages around.
GPS Utility
Written by Alan Murphy: GPS and Datalogger track file import, export, conversion and lots more.
GPX File Format Resources
Resources on the GPS Exchange Format
Garmin
Garmin's official website.
Magellan USA
Magellan GPS accessories and cables.
Interagency GPS Executive Board
GPS Information and Applications.