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revision 01/00
The ISOM (1990) lays down the permissible combination of screens.
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Symbol Allowed with Not allowed with
Broken ground 116 403, 404, 406, 407, 408, 409, 410 210, 309, 310, 311, 401, 402
Stony ground 210 311, 402, 403, 404, 406, 407, 408, 409, 410 116, 309, 310, 401
Uncrossable marsh 309 No combinations allowed, cut all screens to the edge of this symbol.
Marsh 310 403, 404, 406, 407, 408, 409, 410 116, 210, 309, 311, 401, 402
Indistinct marsh 311 210, 401, 402, 403, 404, 406, 407,408,409,410 116, 309, 310
Open land 401 Only indistinct marsh 311 is allowed with this symbol! Do you check?
Open / scattered 402 210, 311 309, 310, 401, 402, 403, 404, 406, 407, 408, 409, 410
Rough open land 403 116, 210, 310, 311, 407, 409 309, 401, 402, 404, 406, 408, 410
Rough / scattered 404 116, 210, 310, 311, 407, 409 309, 401, 402, 403, 406, 408, 410
Forest: slow 406 116, 210, 310, 311 309, 401, 402, 403, 404, 407, 408, 409, 410
Undergrowth, slow 407 116, 210, 310, 311, 403, 404 309, 401, 402, 406, 408, 409, 410
Forest: difficult 408 116, 210, 310, 311 309, 401, 402, 403, 404, 406, 407, 409, 410
Undergrowth, diff. 409 116, 210, 310, 311, 403, 404 309, 401, 402, 406, 407, 408, 410
Vegetation, fight 410 116, 210, 310, 311 309, 401, 402, 403, 404, 406, 407, 408, 409
The following screens are not specifically listed in the combinations section of the specifications:
Screens that should remain on their own, no combinations allowed
Open sandy ground 211, Bare rock 212, Lake 301, Pond 302, Orchard 412, Vineyard 413, Cultivated land 415, and Parking area 530
Screens that may be combined with any screen:
Forest: easy running 405, Permanently out of bounds 529, Out-of-bounds area 709, and Dangerous area 710
Screens with other rules of combination:-
Forest runnable in one direction 411, use the appropriate rules from the main runnability colour,
Settlement 528, significant features must be shown for the yellow/green symbol, or the black line screen with no underlying detail should be used.
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