Deviations from the specifications are permissible only with the sanction of the national Ski-O Committee. For international events, sanction must be given by the IOF Ski-O Committee.
Complete foot-orienteering maps may be used in ski-o competitions at all levels, if the dark green (symbol 410) is replaced by light green (symbol 406). For international events, permission from the IOF Ski-O Committee is required.