Other MarkIALA System
Isolated Danger Mark
Identification guide and characteristics for safe navigation.
Erected on, or moored above, an isolated danger of limited extent that has navigable water all around it (like a sunken rock or small wreck).
👁️ Visual Characteristics
Color Scheme
Black with one or more broad Red horizontal bands
Topmark
Two black spheres, one above the other
Buoy Shape
Pillar or Spar
💡 Night Identification (Light)
Color of Light
White
Light Rhythm
Group Flashing Fl(2)
IALA Regions
The world is divided into two IALA regions (A and B). While Cardinal, Isolated Danger, Safe Water, and Special marks are the same globally, Lateral Marks have different color conventions depending on the region.
- Region A: Europe, Australia, New Zealand, Africa, Gulf and some Asian countries.
- Region B: Americas, Japan, South Korea, Philippines.