Amateur radio direction finding (ARDF, also known as radio orienteering
and radiosport) is an amateur racing sport that combines radio direction
finding with the map and compass skills of orienteering. 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.
https://en.wikipedia.org/wiki/Amateur_radio_direction_finding
https://en.wikipedia.org/wiki/Amateur_radio_direction_finding
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