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US Buoyage

Isolated-danger mark

Technical visualIsolated-danger mark
Isolated-danger markA black mark with a red horizontal band, two black ball topmarks, and an isolated charted danger below it.ISOLATED-DANGER MARK
Isolated-danger markA black mark with a red horizontal band, two black ball topmarks, and an isolated charted danger below it. 11ISOLATED-DANGER MARK

isolated charted danger — do not pass close

An isolated danger has navigable water around it. Use charted depth and the hazard itself to choose safe clearance.

Appearance

black with one or more red horizontal bands

two black balls as topmark

Light

White group flashing two.

Meaning

Marks an isolated danger with navigable water around it.

Pass on an appropriate side with due regard to the chart, depth and the hazard itself. Do not treat "water all around" as an invitation to pass close.

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