Isolated danger mark

File: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.<ref name=":0">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

File:Isolated Danger Mark near Hvar Croatia.jpg

Isolated Danger Mark near Hvar, Croatia

Isolated danger marks are recognisable by the following characteristics:<ref name=":0" /><ref name=":1">{{#invoke:citation/CS1|citation

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• Generally a pillar or spar shape, but could alternatively be any other shape as long as the shape is different from those used for lateral marks.
• Coloured black with one or more broad horizontal red bands.
• Always having a topmark attached which is two black spheres stacked vertically.
• If a light is fitted, it is white in colour and has a light characteristic of group flashing 2 (abbreviated as "Fl(2) W"). Two flashes of white light in succession are followed by a longer duration of darkness.

See also

• Navigation
• Lateral mark
• Cardinal mark
• Safe water mark
• Special mark
• Emergency wreck buoy
• Light characteristic

References

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