Definition of Special Marks
As per IALA Buoyage system, Marks used to indicate a special area or feature whose nature may be apparent from reference to a chart or other nautical publication. They are not generally intended to mark channels or obstructions where other marks are more suitable.
Some examples of uses of Special Marks.
- Ocean Data Acquisition Systems (ODAS) marks.
- Traffic separation marks where use of conventional channel marking may cause confusion.
- Spoil Ground marks.
- Military exercise zone marks.
- Cable or pipeline marks.
- Recreation zone marks.
- Boundaries of anchorage areas..
- Structures such as offshore renewable energy installations.