An Isolated Danger mark is placed on, or moored on or above, an isolated danger which has navigable water all around it.
Because the extent of the danger and the safe passing distance cannot be specified for all circumstances in which this mark may be used, the mariner must consult charts and nautical publications for guidance.
Typically used to mark hazards such as an underwater shoal or rock.
Colour of isolated danger marks
They are coloured black and red.
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