- Source: Isolated danger mark
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.
It is recognisable by its black and red bands and top-mark of two black balls.
Its distinctive sequence of flashing white light consists of 2 quick flashes in intervals of either 5 or 10 seconds.
See also
Navigation
Lateral mark
Cardinal mark
Safe water mark
Special mark
Emergency wreck buoy
Footnotes
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) (in French). France: SHOM. ISBN 978-2-11-139457-5. Retrieved 11 August 2019. {{cite book}}: |work= ignored (help)
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