Andreas Dresen-László Zentai: ISOM 2000

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History and Development of Drawing Specification

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The beginning of orienteering used official topographic maps at scales 1:20 000 - 1:40 000

• ISOM 1969
  • Scale: 1:25 000
  • Colours: black, white, brown, blue, grey for runnability (vegetation)
  
  
• ISOM 1975
  • Scale: 1:20.000
  • Colours: black, white, brown, blue, green (4 categories of runnability), yellow
  • Altogether 100 symbols (besides course setting symbols)
  
  
• ISOM 1982
  • Scale: 1:15000
  • Colours: black, white, brown, blue, green (4 categories of runnability), yellow, more possibilities for combining colours (yellow screen) and a better flexibility in the presentation of vegetation and runnability.
  • Altogether 98 symbols (excluding course setting symbols)
  
  
• ISOM 1990
  • Scale 1:15000
  • Colours: green "stripes'" for the presentation of reduced runnability by good visibility, abolishing regional symbols (B-Symbols).
  • Altogether 105 symbols (excluding course setting symbols)

Development of ISOM from a “guideline” to a “competition rule” by continual improvement of colours and symbol definitions on the basis of many tests and investigations.

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