See Also...ISOM Start Page ISOM2000 Map Index BOF map rules 1997 previous next
The map committee wishes to thank Brian Parker, GBR for his valuable comments and co-operation in compiling this section of the ISOM.
With the exception of the variations given in the following paragraphs, the specification for international trail orienteering maps is that for foot orienteering maps.
Maps for international trail orienteering are based on foot orienteering mapping
specifications and are usually amended versions of sections of foot orienteering
maps. Although important, the number and extent of the amendments are generally
Trail orienteering requires map and terrain interpretation by competitors on tracks, paths and marked routes (referred to as 'trails'). Competitors are not permitted to enter the terrain off the trails and this has a number of consequences for Trail-O mapping.
The competition area is that adjacent to the trails, generally within 50m. Concentrating on this greatly reduced area, compared with foot orienteering, leads to a more detailed terrain representation and an enlarged map scale.
The map must fairly represent the terrain as seen from the trails. Features which cannot be seen may be omitted, particularly if their inclusion would distort the representation of visible features.
The concept of runnability cannot apply to trail orienteering. Those symbols and descriptions in foot orienteering which refer to passability and runnability of terrain features off the trails are amended to refer to appearance and visibility .
Trail orienteering provides competition for disabled entrants. There is a need to represent on the map stepped sections of the trails which present difficulties to competitors with impaired mobility. Special symbols are introduced for this purpose.
The scale for an international trail orienteering map is 1:5000. The dimensions of symbols, lines and line screens are 100% greater than those used for 1:15000 foot orienteering maps.
The contour interval for trail orienteering maps follows the same rules as for foot-orienteering maps.
Maps for trail-orienteering are likely to be reproduced in relatively small
quantities. Since Trail-O maps uses symbols enlarged by 100%, the new and cheaper
4-colour printing methods, such as digital colour
printing, colour copying and digital offset are well suited. Please refer also
to section 3.4 Printing, in this publication.