in addition to the rules of the sport, ardf competitions must also comply with radio regulations. because the transmitters operate on frequencies assigned to the amateur radio service, a radio amateur with a license that is valid for the country in which the competition is taking place must be present and responsible for their operation. individual competitors, however, are generally not required to have amateur radio licences, as the use of simple handheld radio receivers does not typically require a license. regulatory prohibitions on the use of amateur radio frequencies for commercial use generally preclude the awarding of monetary prizes to competitors. typical awards for ardf events are medals, trophies, plaques, or certificates.