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A marked point for rock below chart datum.
Also known as: Submerged rock symbol, Covered rock symbol
On a nautical chart an underwater rock is drawn as a marked point with its depth, denoting rock that stays covered but may still endanger a deep-draught vessel.
Marks rock that remains covered at chart datum, annotated with the depth over it.
Contexts: Navigation
Is dangerous or not according to a vessel's draught, which is why the chart gives the depth rather than a verdict.
Contexts: Navigation
A small cross or dotted mark with a depth figure beside it, drawn at the rock's charted position.