See Also...310 304 ISOM Index Water and marsh index previous next
309 Uncrossable marsh
A marsh which is uncrossable or dangerous for the runner. A black line surrounds the symbol.
Colour: blue, black.
Bank line width 0.18mm, blue marsh line 0.25mm
Line spacing 0.25mm (0.5mm line to line)
This symbol is oriented to north.
As ISOM 2000 but bank line width was 0.175mm, and the combinations have been changed
Defined as area symbol 309.0, and can be drawn with any drawing tool.
Care is needed at joins, overlap only where it is safe (usually if it is the same colour and always if it is the same symbol). If you need to share a common boundary with another symbol, draw along the edge with the control key to follow it exactly.
Underlying area colours will show through the symbol in the spaces between the blue lines, as no underlying colour is allowed, the symbol must be edge matched.
If there is any possibility of danger to runners, then this symbol must be used.
This is a symbol that must have a distinct edge even if there is no mappable boundary on the ground. If the edge is indistinct, surround this symbol with the marsh or indistinct marsh symbols. Strict edge matching will be needed or the blue lines will clash.
The ISOM lays down the permissible combination of screens.
Uncrossable marsh may now combine with 401, 402, 403 & 404, cut all other screens to the edge of this symbol.
If this symbol is used in a yellow area, especially a full yellow area (open land), then it will tend to green out, as both the blue and the yellow will print.
If you use the colour table hint to knockout the yellow, as described in the full blue topics, then there could be a problem with white edges to the symbol with any print misregistration.
There are more details in the Main Help File or in the Colour Help file.
Click to go to the top of this page