Isolated danger mark
{{short description|Sea mark indicating a danger spot}}
Image:IALA isolated danger.png
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
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}}
See also
{{Portal|Geography}}
Footnotes
{{reflist}}
References
- {{Cite web | author=International association of maritime aids to navigation and lighthouse authorities|title = Maritime buoyage system and other aids to navigation | publisher = IALA-AISM | year = 2010|ref={{harvid|IALA|2010}}|url=https://www.irishlights.ie/media/11141/IALA-MBS.pdf|accessdate=11 August 2019}}
- {{cite book|author=Service Hydrographique et Océanographique de la Marine|title=Signalisation Maritime|isbn=978-2-11-139457-5|work=Ouvrages Généraux|publisher=SHOM|date=1 September 2016|publication-place=France|language=French|url=http://nauticalfree.free.fr/nautical/Doc_FR_SHOM_Signalisation_3.pdf|accessdate=11 August 2019|ref={{harvid|SHOM|2016}}}}
{{Commons category|Isolated danger marks}}
{{DEFAULTSORT:Isolated Danger Mark}}