Rock is a special category of landform. The inclusion of rock gives useful information about danger and runnability as well as providing features for map reading and control points. Rock is shown in black to distinguish it from other landform features.
Care must be taken to make sure that rock features such as cliffs fit with the shape and fall of the ground as shown by contours.
To train and learn this category of symbols: Game: Map symbols – Rock and boulders
(click the images to enlarge them)
|A cliff, quarry or earth bank that is so high and steep that it is impossible to pass/climb or is dangerous.
|A passable cliff or quarry. If the direction of fall of the cliff is not apparent from the contours, or to improve legibility, short tags may be drawn in the direction of the downslope.
|ROCKY PIT OR CAVE
|Rocky pits, holes, caves or mineshafts which may constitute a danger to the competitor.
|A distinct boulder (should be higher than 1 m), which is immediately identifiable on the ground. Groups of boulders are represented using symbol Boulder cluster (207) or a boulder field symbol (208, 209).
|A particularly large and distinct boulder. A large boulder should be more than 2 m high.
|GIGANTIC BOULDER OR ROCK PILAR
|A gigantic boulder, rock pillar or massive cliff shall be represented in plan shape. The objects can vary in shape and width.
|A distinct group of boulders so closely clustered together that they cannot be marked individually. The boulders in the cluster should be higher than 1 m.
|An area covered with so many scattered blocks of stone that they cannot be marked individually.
|DENSE BOULDER FIELD
|An area covered with so many blocks of stone that they cannot be marked individually and the runnability is affected.
|STONY GROUND SLOW RUNNING
|Stony or rocky ground which reduces runnability to about 60-80% of normal speed.
|STONY GROUND WALK
|Stony or rocky ground which reduces the runnability significantly (to about 20-60% of normal speed).
|STONY GROUND FIGHT
|Stony or rocky ground which is hardly passable (less than 20% of normal speed).
|An area of soft sandy ground where runnability is reduced to less than 80% of normal speed.
|A runnable area of rock without earth or vegetation should be shown as bare rock.
|Rocky or artificial trench. Minimum depth should be 1 m.