See Also...519 520 ISOM Index Man-made features index previous next
521 High stone wall
A stone wall higher than ca 1.5m, not crossable to the average orienteer.
Line width 0.18mm
Dot diameter 0.4mm, spacings 2.5mm & 0.6mm
As ISOM 2000 but line width was 0.175mm
ISOM number changed from 522 to 521.
Defined as line symbol 521.0. Can be drawn with any tool but bézier mode is preferable.
If the bézier tool is used, care must be taken as dot spacings are dependent on location of nodes and handles. The smaller dot gap is particularly vulnerable to the effects of tight curves on the spacing. See bézier topic for more information.
All crossing points (gates, stiles and gaps) must be shown; if they are not to be used on the day of the competition, then this is indicated on the overprint, map corrections or on the ground, as appropriate.
a stone boundary.
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