IALA Isolated Danger Marks
Placed directly on or above an isolated danger with navigable water all around. Black with red horizontal band(s).
Isolated danger marks are placed on or moored over an isolated danger with navigable water all around. The danger has a limited extent.
- Colour: black with one or more red horizontal bands - Topmark: two black spheres (balls) vertically - Light: white, group flashing (2) — two flashes - Shape: pillar or spar
Vessels may pass on any side but should keep clear of the mark itself as the danger is directly below or very close.
Punts Clau
Danger is directly below the mark
Navigable water exists all around the mark
Two black balls as topmark
White light: group flashing (2)
Errors Freqüents
Passing too close to the mark — the danger is right below it
Confusing with cardinal marks which indicate direction of safe water
Posa a Prova els teus Coneixements
Test your knowledge and prove your mastery.