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Isolated danger mark
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{{short description|Sea mark indicating a danger spot}} [[Image:IALA isolated danger.png|right|thumb|Examples of Isolated Danger 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.{{sfn|IALA|2010|loc=section 4}} [[File:Isolated Danger Mark near Hvar Croatia.jpg|right|thumb|Isolated Danger Mark near Hvar, Croatia]] It is recognisable by its black and red bands and top-mark of two black balls.{{sfn|IALA|2010|loc=section 4}} Its distinctive sequence of flashing white light consists of 2 quick flashes in intervals of either 5 or 10 seconds.{{sfn|SHOM|2016|loc=section 1.2.4}}
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