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Trail-O

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7 MAP SPECIFICATION FOR TRAIL ORIENTEERING

7.1 General

The map committee wishes to thank Brian Parker, GBR for his valuable comments and co-operation in compiling this section of the ISOM.

7.2 Content

With the exception of the variations given in the following paragraphs, the specification for international trail orienteering maps is that for foot orienteering maps.

7.2 Content

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 not large.

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.

7.3 Scale

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.

7.4 Contour interval

The contour interval for trail orienteering maps follows the same rules as for foot-orienteering maps.

7.5 Printing and reproduction

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.


International Specification for Orienteering Maps produced by the International Orienteering Federation
OCAD produced by Hans Steinegger Software. 1988-1999 Hans Steinegger. OCAD is a registered trademark of Hans Steinegger
This document has been written and coded by Peter Hornsby of Ashby Mapping
Apologies for any mistakes and errors; please inform details of any problems, thanks.
Produced for the Ashby Mapping internet site on
12 May 2000