Isolated danger mark
![](http://upload.wikimedia.org/wikipedia/commons/b/ba/IALA_isolated_danger.png)
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.[1]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Isolated_Danger_Mark_near_Hvar_Croatia.jpg/220px-Isolated_Danger_Mark_near_Hvar_Croatia.jpg)
Isolated Danger Mark near Hvar, Croatia
It is recognisable by its black and red bands and top-mark of two black balls.[1]
Its distinctive sequence of flashing white light consists of 2 quick flashes in intervals of either 5 or 10 seconds.[2]
See also[]
Footnotes[]
- ^ Jump up to: a b IALA 2010, section 4.
- ^ SHOM 2016, section 1.2.4.
References[]
- International association of maritime aids to navigation and lighthouse authorities (2010). "Maritime buoyage system and other aids to navigation" (PDF). IALA-AISM. Retrieved 11 August 2019.
- Service Hydrographique et Océanographique de la Marine (1 September 2016). Signalisation Maritime (PDF). Ouvrages Généraux (in French). France: SHOM. ISBN 978-2-11-139457-5. Retrieved 11 August 2019.
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