Isolated danger mark

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.

Isolated Danger Mark near Hvar, Croatia

It is recognisable by its black and red bands and top-mark of two black balls.

it`s distinctive sequence of flashing light consists of 2 quick flashes with intervals of 5 seconds.

See also

• Navigation
• Lateral mark
• Cardinal mark
• Safe water mark
• Special mark

References

• "Isolated Danger Marks". IALA. http://www.iala-aism.org/web/pages/publications/docpdf/mbsenpdf/mbs6to9.pdf.