Navigation problems are all moderately difficult, and use major, or the more evident, terrain features. Ideally, much time is spent off trails. Usually in the 3.0 - 5.0 km range in length. All are Advanced Courses. The navigational challenges are at the same level of difficulty.
Courses become progressively longer in length, requiring better physical conditioning.
Course design gives maximum amount of time off trails. Red length 5-8km. Blue length 7-12km. Rather than the usual course consisting of a sequence of controls to visit in a prescribed order, Score-O allows you to visit a large number of controls in any order you like. We usually have a fixed time limit, with more controls than you could possibly visit in that time, and we usually have varying point values for the controls depending upon their difficulty, so that the maximum accumulated points is the objective.