An Isolated Danger Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate a hazard to shipping such as a partially submerged rock. Isolated danger marks are recognisable by the following characteristics: Generally a pillar or spar shape, but could alternatively be any other shape as long as the shape is different from those used for lateral marks.
An Isolated Danger Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate a hazard to shipping such as a partially submerged rock. Isolated danger marks are recognisable by the following characteristics: Generally a pillar or spar shape, but could alternatively be any other shape as long as the shape is different from those used for lateral marks.
Source: Wikipedia "Isolated danger mark" · CC BY-SA 4.0
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