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/

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/

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