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Used to indicate a newly discovered hazard to navigation. |
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The danger is not yet shown on charts or included in sailing directions. |
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The danger is not yet sufficiently promulgated by notices to mariners. |
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The term covers naturally occurring obstructions such as sandbanks or rocks. |
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It may be also man made dangers such as wrecks. |
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One or more cardinal or lateral marks may be used. |
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If dangers are especially grave, at least one of the marks are duplicated. |
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A quick or very quick light if lit. |
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If cardinal mark, it will exhibit white light. |
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If lateral mark, it will exhibit red or green light. |
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A racon of morse code D, showing a signal length of one nautical mile may be used. |