Garmin GPS and MapSource Maps
Side-by-Side comparison pages of Garmin's MapSource line of GPS moving map products.
GPS Nuts
Practical guides, tips, tricks, equipment, software reviews, and other related information provided by recreational GPS users.
GPS World
Magazine, buyer's guide, solutions database, columns, products and reviews, and employment opportunities.
Peter Bennett's FTP directory
NMEA-0183 and GPS Information
Sam Wormley's Global Positioning System
Large collection of information/education resources and links, from Iowa State University.