Radio Orienteering

Amateur Radio Direction Finding (ARDF)

Welcome to Radio-O.  Here is how it works! We provide a radio receiver with a directional antenna, an orienteering map, a compass, and a finger stick. By pointing the antenna and listening to the signal you can determine the direction of the signal.  Using this information you navigate to the transmitter and punch in with your finger stick. Only the start and finish are marked on the map and it is important to keep track of where you are.  To qualify as finishing you must find at least one transmitter on your course and reach the finish within the time limit. To calculate results -- first; the number of assigned transmitters you found, then; your time on the course. We offer beginner through advanced courses, Regular BOK fees apply, and Pre-Registration is required.

Latest News in Radio Orienteering

July 21st, 2022

Results – Umstead West 80m Radio Orienteering & Beginner Training – 17 July 2022

There was a strong showing of eleven beginners, and two intermediate-level radio orienteers, on this warm, humid, July morning. A few Radio Orienteering experts were also on hand. The beginners worked as a group, walking together, learning the basics of operating an 80m direction-finding receiver. For simplicity, all beginner participants used identical R3500D receivers. With […]

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June 7th, 2022

Radio Orienteering Classes at Bond Park

Youth Radio Orienteering.
This is a Town of Cary class at Bond Park, and is not hosted by BOK.
Registration is available online at, by mail, and in person at staffed Town of Cary facilities.
July 6-8, or 11-13, both 3-day classes meet 9 AM to Noon

Do you know of a young man or woman age 11-16 who likes the outdoors and electronics and is looking for a fun summer activity?

There is a unique opportunity offered by the Town of Cary this July: Radio Orienteering. It is an international sport that most folks have never heard of! Radio direction-finding (or Radio Orienteering) is the sport of locating transmitters in the park. It is an outdoor sport that combines maps and compasses with radio receivers and transmitters. Students will learn to read maps, determine directions using a compass, and operate radio receivers to hunt down transmitters. It is all about walking, thinking, and competing. All sessions will be taught by a two-time world champion in the sport. All equipment will be provided. You can view the class description in the Town of Cary Recreation Guide, and instructions for registering are on the last 3 pages of the Guide. Fee: $99 Cary Residents, $129 non-residents.

May 25th, 2022

Results – Raven Rock 2m Radio Orienteering June 5, 2022

Results ALL 5 Foxes 5.0 km 235 m 180 min (5 Controls) 1 Matt Craig   5 p (136:32) 7000530 4 Foxes (not #4)3.9 km 204 m 180 min (4 Controls) 1 Joseph Huberman   4 p (96:56) 2005005 2 Adalia Schafrath-Craig   4 p (103:22) 2049374 3 Ruth Bromer   4 p (125:59) 2005002 […]

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May 4th, 2022

Results: Open Gray Owl ARDF & Orienteering event on May 14-15,

Saturday started out with some steady rain, and a few hardy souls started out, but by 11am the rain stopped and the sun even began to peak out. Sunday was a beautiful day. After the events on both days we enjoyed pizza together sitting out on the deck. For the 2m Radio Orienteering, Joseph built […]

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April 17th, 2022

Open Radio-O/ARDF event at Carolina North Forest, April 24.

We will have an 80 m classic course at Carolina North Forest on April 24, Sunday. Park at the Orange County Health Department off of Homestead Rd (GPS 35.9483 -79.0649, Google maps link). Then follow the BOK signs to pick up your map. For more information about Radio-O/ARDF, see the BOK ARDF page.

The course opens at 10 AM and closes at 2 PM. Everyone must pre-register here to participate. There is no need to sign up for a particular course. Everyone gets the same map. Please register by the end of the day on Friday, April 22.

The course. The homing beacon is the finish. There is only one control to punch at the homing beacon and it is the finish. There is no finish chute. There is a 300 m exclusion zone around the start and around each control. Foxes will be on 3.53 MHz, the homing beacon on 3.55 MHz. For getting all five foxes, the straight-line course length is 4.7 km.