Radio Society of Great Britain
Links to IARU ARDF Sites

Full Rules
http://www.ardf-r1/download/newru24a.pdf Rules for setting up large International Events. (As at Aug 2006, link from Region 1 website not working)
http://www.ardf-r1.org/rulesv27b.pdf Rules for Competitions.

Sites of various national societies
Germany http://www.darc.de/referate/ardf/english.htm
France http://www.ref-union.org/ardf
Belgium http://www.uba.be/
Holland http://www.rdf.demon.nl
Italy http://www.ardf.it
Canada http://www.rac.ca/opsinfo/ardf.htm
Russia http://www.ardf.da.ru
Slovenia http://lea.hamradio.si/arg
Czech Republic http://www.ardf.cz
Norway http://www.ardf.no/
USA http://www.homingin.com

IARU Region 1 ARDF Working Group
http://www.ardf-r1.org

Other interesting sites
http://en.wikipedia.org/wiki/Amateur_Radio_Direction_Finding An on-line encyclopedia gives an excellent description of ARDF including good coverage of the history and origins of the sport.
http://www.qsl.net/on7yd/ardf.htm The site of Rik Strobbe (the Mr DF of Belgium). It includes lots of good technical stuff regarding suitable transmitters and controllers
http://www.df7xu.de Site of Dieter Schwider in German. Good list of German events.
http://home.introweb.nl/~pa3fdc/ Site of Ferry de Vroom in English and Flemish. Lists Dutch and Belgian events.
http://www.xs4all.nl/~pa0nhc/ham.htm Site of PA0NHC in English and Flemish. There is some interesting ARDF constructional information on this wide ranging site.
http://www.ardf.nl/ Site of PA3FJQ.
http://www.users.bigpond.net.au/vk3yng/ Site of Bryan Ackerly VK3YNG (Australia). Packed with details of kits and innovative ideas for ARDF equipment.