A chart symbol: a horizontal line crossed by three short upright strokes, the middle one longest, all inside a dotted oval. Depth figures of 13 to 16 metres are printed around it.
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A wreck considered dangerous to surface vessels. The line with three cross strokes is a wreck whose depth is not known. The dotted "danger line" round it means it is considered dangerous to surface navigation. The same symbol without the dotted line is a wreck not considered dangerous to surface vessels, which is still no promise of safe depth for every boat.
