1) Names and descriptions brought into line with the ISOM 2000 terminology.
2) Removal of 1990 symbols for Rib, Cairn/stone pile, Small marsh, Ditch, Felled area, Hedge.
3) Removal of additional symbol for Salt Lick.
4) New symbols introduced for Boulder cluster, Water tank or trough, Tunnel, Crossing point, Paved area, Pipeline, Low, Beneath.
5) Change of symbol for Copse, Distinctive Tree.
6) Redefinition of symbol previously used for Seasonal watercourse.
7) Three new symbols introduced for use in Park/Sprint ‘O’.
8) New special instruction lines introduced for Taped Route between control sites, Mandatory Crossing Points between controls, and Mandatory Route through Out of Bounds.
9) Crossing and Junction symbols moved to Column F, and both features must always be shown in columns D and E.
10) Between symbol remains in Column G, but both features must now be shown separately in columns D and E.
11) Clarification of when Column G - Location of the control flag needs to be used.

-- from "IOF Control Descriptions 2004 Edition"(pdf document)

1990 Rib Cairn/stone pile Small marsh Ditch Felled area Linear thicket Salt lick

2004 Distinctive tree Copse Boulder cluster Water tank, trough Tunnel Paved area Pipeline Low Beneath

1990 2004 Seasonal watercourse Minor water channel Hedge Linear thicket Boundary stone Boundary stone, cairn Gate Crossing point Root stock Tree stump, root stock Dry ditch Small erosion gully

Park/Sprint-O:

Stairway

Monument, statue

Building pass through

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