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/

TREC UK
- Information about the sport of TREC, which includes mounted orienteering, and discussion forum.
- http://trec-uk.com

National 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/

Michigan Competitive Mounted Orienteering
- Sport, membership, and ride information.
- http://members.aol.com/totemks/cmomain.htm