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Isolated Danger Buoys

Placed directly above a hazard such as a submerged rock or a wreck, but has navigable water all around it

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Isolated danger buoys are placed directly above a hazard such as a submerged rock or a wreck, but has navigable water all around it. Unlike cardinal buoys, they can be passed either side.

Isolated Danger Marks - Sailing Aids to Navigation
Colour Horizontal Black & Red stripes
Shapes Conical, Pillar, Spar
Top Marks Two black balls in a vertical line
Lights White, 2 quick flashes with intervals of 5 seconds
Chart Symbol Isolated Danger Buoy - Chart Symbol