Michigan Competitive Mounted Orienteering 
Sport, membership, and ride information.
http://members.aol.com/totemks/cmomain.htmNational Association of Competitive Mounted Orienteering
A non-profit organization offering information on the objectives of the sport, membership, ride calendar, ride results, chatroom, newsletters, and links.
http://www.nacmo.org/
TREC UK
Information about the sport of TREC, which includes mounted orienteering, and discussion forum.
http://trec-uk.com
Mercia TREC Club
English club that practices TREC, a competition that is a combination of orienteering on horseback, and maintaining set speeds (normally trot or walk).
http://www.chd-solutions.co.uk/trec/
