What are Special Marks?

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.