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Special marks

SPECIAL MARKS

Special marks. 

Definition of Special Marks

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.

 

SPECIAL MARKS

SPECIAL MARKS DESCR 

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;

Aquaculture.

Source: IALA

Written by Master

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When and where ready (WWR)

ISOLATED DANGER MARK

Isolated Danger marks