About Radio Orienteering

What do you get if you combine handling radio equipment, running (or walking) in the beautiful Swedish nature, and solving a shortest-route problem? It is radio orienteering and in Gothenburg, the local name is Göteborgs Rävjägare (GRJ). All you have is a radio receiver, a map and a compass. Your task is to find radio transmitters hidden in the forest. See https://en.m.wikipedia.org/wiki/Radio_orienteering and https://pejla.se/ for further information.

All are welcome to reach us and try this sport. See About us / Contact us page for more details.

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DM lördagen 14 sept kl 14

Härmed inbjuds till DM i radioorientering!


Tid: Lördagen 14 sept, samling 14:00, start 14:28

Plats: Partille, Korsningen Lexbydalsvägen/Surketjärnsvägen. 57.7734, 12.1298(Samåk gärna – parkeringsplatsen är liten.)

Tävlingstyp: 80 m med skärmar

Telefon till tävlingssekretariatet: 076 119 1452

Observera att tävlingen inte går den 15 sept som det står i GRJ-kalendern och på hemsidan! Observera även klockslaget, samling 14:00. Alla de mest aktiva deltagarna är tillfrågade och har uttryckt sig positiva eller neutrala till ändringen. Tack för det!

Det finns olika uppfattningar om att tävla med eller utan skärmar. De flesta som uttryckte en åsikt i frågan vill ha skärmar, och då blir det så den här gången.

Däremot blir det ingen målräv, som det är på internationella tävlingar. Det har föreslagits att införa detta även hos GRJ. Jag är visserligen positiv till att pröva, men jag tycker inte att DM är rätt tillfälle.


Välkomna!
Hälsningar Erik

Välkommen till den första sjurävarsjakten på länge! – Tisdag 27 augusti 2019

Att tänka på: Som vi är vana, sänder varje räv en minut i taget, så ett sändningspass blir sju minuter långt.

Samling: Lilla parkeringen norr om Pixbovägen i östra Mölndal. Vid P i kartklippet nedan. OBS! Ingen markering om parkering finns längs vägkanten. Var uppmärksam.

Karta: Östra Göteland. Skala 1:7500.

Terräng: Begränsat område: ca: 400/800m x 1400m. Normal kupering. Rikt stignät.

Papper: A4, extravitt, 120 g/m2.

Tider: Samling 18.00. Start 18.28. Rävstart 18.30.

Hisingsparken 2019


Ingvar waiting for Aurel, meanwhile can you spot the antenna?
Bearings from Erik S
Results of the hunt

It was a fantastic day with good weather and a very pleasing landscape of hisingsparken. It was great to see five participants and luckily I had maps for eight people 🙂

As an organizer of the event, I added a few new rules:

  • Wait for 1:30 hours before taking out the foxes after all hunters have been there: Erik S pointed out that this could be useful for those who experience frequency drift or moved their frequency knob involuntarily.
  • Subtract 1 minute from the final time for finding at least one plastic bag or object from the forest.

I am very happy that all the hunters found all the foxes. I heard they were well hidden in the natural formations provided by nature. Something very special about Göteborg RävJägare (GRJ) is that we do not put out the screens where the foxes are located. Unlike in the official events where an orienteering sign is put up.

It was fun to listen to the Morse coded hunter count while trying to guess who could be where during the hunt. Thinking about what strategies they could have used. The fun part for me is the above picture where the antenna that I put out for fox 4 came down when Ingvar took it down by mistake. There was still Aurel who had to take fox 4 so if you look closely at the above photo. The antenna is couple of meters above ground and laying horizontal going via another tree. Above Ingvar’s head (2m) is the top hook of the antenna as it horizontally travels left to the neighboring tree and finally reaches the left most bent tree where fox 4 was hidden between two small boulders. Aurel had two or so transmissions left before he could find the fox. He managed to find the antenna and trace it to find the fox 🙂

Ending ceremony: An eventful scoring as Robert’s puncher #4 did not record anything. I wonder if there was any chip inside it. Finally for the results, this Aurel’s first hunt to take all the foxes with his home made receiver. He was well applauded for his achievement 🙂 Erik S came in first. While the second place with plastics and a glass bottle was Erik A. The difference between them was more than 2 minutes. Luckily the plastics did not tip the final results as one minute was reduced from Erik A’s score but it nevertheless was a huge bonus for the environment with one plastic and a glass bottle less 🙂

The fastest route according to Erik S calculator is 4-3-1-5-2 with a distance of 2.6 kms. The calculator did not account for elevation or difficult path from fox 1 to fox 5 due to steep cliffs. Perhaps taking the tracks was more useful than fighting through the forest which probably was a deciding factor in the final outcome. But then you miss out on the beautiful secrets of the forest and kantareller 🙂

Next hunt, 22nd August, Änggårdsbergen organized by Aurel.

Cykeljakt resultat 20190613

cykeljakt

View in OpenStreetMap via umap

It was a wonderful warm day. A colleague of mine dropped me off near the starting point along with my bicycle. To my surprise other orienteers had biked to the start. The map from the event organizer, David, was heart shaped and it did not fit on a A4 size. Probably more of a double A4 and an A5. Erik and Robert had the map fixed on the handle bar. While Ingvar and Tilak had it in their hand. As for the receiver, for Erik it hanging on his neck, while for Tilak it was hanging from the wrist. Others had their receivers on hand. The hunters were expected to finish at Fox#3. All the foxes were well highlighted with screens and well placed within biking paths.

With two minutes to start, Erik had gone invisible. It was later discovered that he started with Fox#2. While, Robert, Tilak and Ingvar started with Fox#4. From the final results, it looks like Robert went for the loudest reception. While others went for the convex-hull. It is interesting that the folks who took all the five foxes, went anti-clockwise. Going from fox#1 near Sankt Sigfridsplan to Östra sjukhus. This bicycle hunt was one of a kind.
Finally, Fox#3 was a delight as there was BBQ setup by David =) Bliss! A fantastic way to finish before summer =)

IMG_20190615_145327