All other areas are out of bounds. No assistance with navigation or problem solving is permitted. No competitor should do anything that they would deem cheating if it applied to another competitor. The IOF will follow this criterion. Definition of Trail Orienteering - Control Choice.
Competitors visit control points in a set sequence.
They interpret the map to choose which of a number of markers represents the one in the centre of a printed circle. This decision must be recorded. The map must be an accurate representation of the terrain. In all cases the course must be overprinted with start, numbered control circles and finish, all drawn with precision. The correct marker must be in the centre of a 4 or 5 mm circle.