What class and difficulty should I choose?
During O-Ringen there is a lot of classifications and different classes. The colors guides you to find the right class for you.
Green course: The courses will be in clear terrain with a good network of line features such as tracks, large paths, buildings, open ground and similar. The controls are always placed on the line feature leading to the most obvious route choice.
White course: The same terrain as above. The controls will only mark the end of a leg and the change over to a new one. The control features are easily identified and obvious.
Yellow course: Can be in more difficult terrain, but runnability will still be very good. The terrain should consist of a coherant network of paths, tracks, fences, open ground or similar.
Orange and red course: The terrain should be runnable, moderately hilly and take place in forest terrain, preferably with an element of cultured ground.The difference between the red and orange course is that unrunnable areas and tough terrain should be completely avoided on an orange course.
Violet course: All types of terrain, but very physically demanding terrain should be avoided. All types of control sites can be used. There should be an element of route choice planning and choosing the right technique to find the controls.
Blue and black course: The difficulty level should be adapted to the most able runners capabilities. The increase in difficulty grade compared with the colours stated above is that the proportion of contour orienteering increases, that detailed terrain and small terrain details should be used. However very physically demanding terrain should be avoided on blue courses.