The IOF’s international specification for control descriptions has been updated in a version, that applies from 2024 onwards. The new specification was published by IOF’s Rules commission and replaces the current version from 2018. It contains several changes, among them a new symbol for map flip under “Special instructions”.

The list of major changes compared to the 2018-version looks like this:

• Now covers both ISOM and ISSprOM.
• Description Sheet should be printed in black.
• If the clarification symbol in column C is not sufficient to unambiguously define the placement of the control flag then the feature is not suitable for a control site.
• Use of Copse symbol extended to include a more runnable area of trees surrounded by thicker forest.
• Use of Building symbol extended to include a pillar supporting a roof.
• New symbol added for a railway or tramway
• Use of Top and Beneath symbols extended to include a the Upper or Lower of two levels.
• New symbol added for a map flip (turn the map over).