Control description categories: Column C | Column D (Landforms; Rock and boulders; Water and marsh; Vegetation; Man-made features; Special items) | Column E | Column F | Column G | Column H | Special instructions
Column D indicates the feature on which the control flag is placed. These are cross-referenced
to the ISOM 2017-2 (International Specification for Orienteering Maps) and ISSprOM 2019-2
(International Specification for Sprint Orienteering Maps) symbol or symbols used to represent
them (which are generally harmonised). Note that where a number is given it includes all symbols
beginning with that number (e.g. 509 indicates 509.1 & 509.2).
If a second control feature is required (i.e. for crossing; junction; between) then this must go in
column E. It is not permitted to place two symbols in Column D.
Water and marsh (ISOM / ISSprOM section 3.3)
| Ref. | Symbol | Name | Description | ISOM/ ISSprOM |
|---|---|---|---|---|
| 3.1 |  | LAKE | A large area of water, normally mapped as uncrossable. | 301 |
| 3.2 |  | POUND | A small area of water, may be shallow or seasonal. | 301 302 |
| 3.3 |  | WATERHOLE | A water-filled pit or depression. | 303 |
| 3.4 |  | RIVER, STREAM, WATERCOURSE | A natural or artificial watercourse with either moving or standing water. | 301 304 305 |
| 3.5 |  | MINOR WATER CHANNEL, DITCH | A natural or man made minor water channel which may contain water only intermittently. | 306 |
| 3.6 |  | NARROW MARSH | A narrow marsh or trickle of water, too narrow to be shown on the map with the marsh symbol. | 309 |
| 3.7 |  | MARSH | A permanently wet area with marsh vegetation. | 307 308 310 |
| 3.8 |  | FIRM GROUND IN MARSH | A non-marshy area within a marsh, or between two marshes. | 307 308 |
| 3.9 |  | WELL | A shaft containing water or a captive spring, clearly visible on the ground. Often with some form of man-made surround. | 311 |
| 3.10 |  | SPRING | The source of a watercourse with a distinct outflow. | 312 |
| 3.11 |  | WATER TANK, WATER TROUGH | A man made water container. | 311 |