
Map Tools http://www.maptools.com/ (tools for measuring and a good introduction to coordinate systems)
Aerospace Corporation http://www.aero.org/publications/GPSPRIMER/
Garmin http://www.garmin.com
Magellan http://www.magellangps.com
Trimble http://www.trimble.com
Maps, Software and CD data, Tools
USA PhotoMap http://jdmcox.com/
Expert GPS http://www.expertgps.com/
Terraserver http://www.terraserver.com
Delorme http://www.delorme.com/
Waypoint+ http://www.tapr.org/~kh2z/Waypoint/
MapTech http://www.maptech.com
MapTools http://maptools.com
Ferguson, Michael. 1997. GPS Land Navigation. Glassford Publishing. PO Box 2895, Boise, Idaho 83701-2895. ISBN 0-9652202-5-7
Kjellstrom, Bjorn. 1994 revision. Be Expert with Map & Compass. MacMillan USA. ISBN 0-02-029265-1
Hotchkiss, Noel J. third edition 1997. Alexis Publishing. Herndon, VA. 20170. ISBN 1-892688-00-X.
Geocaching http://www.geocaching.com/
Geodashing http://geodashing.home.attbi.com/
Navicache http://www.navicache.com/
Google Earth Data Sets Download these kmz files to your desktop and open with Google Earth.)