Bay Area OC - San Francisco Bay Area, CA
Gold Country Orienteers - Sacramento, CA
Greater Phoenix OC - Greater Phoenix, AZ
The national organization for orienteering: Information for beginners, contacts for clubs nationwide, national event schedule and much more.
International Orienteering Federation (IOF)
Includes event schedule, IOF rules, various publications.
International Rogaining Federation
Other O sites
A collection of training tips & commentary. Also an excellent resource for the serious orienteer who wants to improve.
National directory of "Goat" and other long course events.
(Amateur Radio Direction Finding - ARDF)
Regional calendar for Southwestern US. LOAC's past events and website, articles
Outdoor Adventure Racing
Urban and wild map adventures
Nav- X Challenge Series is a collection of map trekking events in Northern California