The purpose of a control description is to give greater precision to the picture given by the map of the control feature and the location of the control flag in relation to this feature.
However, a good control is found primarily by map reading. Descriptions and codes can assist in this task but should be kept as short and simple as is necessary to locate the control.
Control descriptions can be provided in text format or in the International Orienteering Federation (IOF) pictogram format. The pictures below summarise how the IOF Control descriptions sheet is formatted.
The following sheet shows the control description in the left column, followed by the May symbol and the text description.
The complete IOF control descriptions and symbols are listed in the document below.