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A black and red buoy with two black balls.
Also known as: Danger buoy, Wreck marker
An isolated danger mark stands on or above a hazard with navigable water all round it. Two black balls one above the other are its signature, and unlike most marks it says stay away rather than pass this side.
Marks a danger of limited extent with navigable water all around it, the mark standing on or moored above the hazard itself.
Contexts: Navigation, Maps
Carries two black spherical topmarks one above the other, which is its identifying feature in both IALA regions.
Contexts: Navigation, Maps
A pillar buoy in broad horizontal bands of two colours carrying two solid spheres mounted one above the other.