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

May 25th, 2022

Raven Rock 2m Radio Orienteering June 5, 2022

2m ARDF Practice at Raven Rock State Park

This is an OPEN event, everyone is welcome & instruction is available.

We will have a 2m classic course at Raven Rock State Park (near Lillington) on June 5, Sunday. Park at any available spot close to the shelter, or visitor center. The park is likely to be crowded, so arriving early can help ensure you’ll find parking (GPS 35.4621 -78.9121, Google maps link). Then follow the BOK signs from near the shelter to registration and map pick-up. For more information about Radio-O/ARDF, see the BOK ARDF page.

The course opens at 9 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, June 3.

New to 2m Radio Orienteering? We will be able to help you get started and use the 2m receivers throughout the day.

The course: 2m Classic – It will be a non-regulation course with the finish located inside the start’s 750-meter exclusion zone, but not at the start. And there will be no start or finish corridors. All foxes will be at least 400m from the finish, and from one another. The start will be a short walk from registration, and the finish will be a short walk back to the download area/start. Details:

  • Course effective lengths: 5 foxes = 7.4km, 4 foxes = 5.9km
  • Fox frequency: 144.50 MHz
  • Beacon frequency: 145.55 MHz
  • Transmit power: 1W 
  • Antennas: Eggbeater
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.

April 10th, 2022

2022 ARDF Championships — 80m Classic results

The final day of the championships is – as usual – the 80m classic event. The location was similar to that of the 2m event, just North of the campground. The weather was a bit colder than in the previous days, but much drier. The forest was no different though. Many thanks for Charles Scharlau […]

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April 9th, 2022

2022 ARDF Championships — 2m Classic results

Saturday’s event was the 2m classic. Only 5 transmitters, much fewer than the previous days. Everything went fine, we didn’t have any technical issues today. We were also grateful for the trails on the course today: the top finishers all made good use of them. The performance of the day is definitely Eduard Nasybulin’s 82 […]

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