Amateur Radio Direction Finding (ARDF) is an amateur map and compass sport that combines the skills of orienteering and radio direction finding. It is a timed race in which individual competitors use a topographic map, a magnetic compass and radio direction finding apparatus to navigate through diverse wooded terrain while searching for radio transmitters or beacons. Worldwide, the sport is most often referred to by its English-language acronym, ARDF, but is also referred to as radio orienteering or radiosport.ARDF events use radio frequencies on the two-meter amateur radio bands. This band were chosen because of its universal availability to amateur radio licensees in all countries. The radio equipment carried by competitors on a course must be capable of receiving the signal being transmitted by the five transmitters and useful for radio direction finding, including a radio receiver, attenuator, and directional antenna. Most equipment designs integrate all three components into one handheld device.
Map and receiver and beacon
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