Map and Compass Fundamentals - Covers the background and history of navigation plus techniques including navigating around obstacles and dead reckoning. - http://members.impulse.net/~mlynch/land_nav.html
Reading Topographic Maps - Online manual on map reading and land navigation based on US Army training materials which includes instructions on maps, compasses and other navigational aids. - http://www.map-reading.com/
Sun Compass - Using a horizontal sundial as a sun compass by John C. Fakan, Ph.D. - http://www.usscod.org/suncomp/suncomp.html
How To Use a Compass - How to use a compass in several lessons plus how to navigate in poor visibility and how to navigate without a compass. Suggested exercises. Tips on buying a compass. - http://www.learn-orienteering.org/old/
Navigation Technologies - Maker of digital maps for vehicular navigation. About the company and their products. - http://www.navtech.com/
OA Guide to Map and Compass - An excerpt from The Backpackers Field Manual by Rick Curtis, including reference tables, illustrations and real life examples. - http://www.princeton.edu/~oa/manual/mapcompass.shtml
Electronic Compass - Sells magnetic sensor technology for cars, boats, bicycles, and hikers. - http://www.electronic-compass.com/