See Also...International Specification for Orienteering Maps ISOM Index Symbols Index previous next
Rock is a special category of land form. 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 land forms features. (Removed, was in 1990 ISOM - The outline of the symbol should accurately represent the shape of the rock face projected on a horizontal plane.) Care must be taken to make sure that rock features such as cliffs agree with the shape and fall of the ground shown by contours or form lines.
Passable rock face
Open sandy ground
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