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210 Stony ground, slow running

ISOM 2017-2
210 Stony ground slow running (ISOM 2017-2)

Geometry: area.


Stony or rocky ground which reduces runnability to about 60-80% of normal speed.

The dots should be randomly distributed but not interfere with the representation of important terrain features and objects. Illustration serves as an example of density and also point symbol (single dots) can be used to draw stony ground.

To avoid confusion with symbol Distinct vegetation boundary (416), the dots should not be arranged to form a line.


The minimum number of dots is three (footprint 10 m x 10 m).

The maximum distance (centre to centre) between neighbouring dots is 0.6 mm.

The minimum distance (centre to centre) between neighbouring dots is 0.45 mm.

Density: 3-4 dots / mm².

Colour: black.

Correct examples

Incorrect examples