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An abbreviation marking rock on the seabed.
Also known as: Rock seabed abbreviation, Bottom quality rock
On a nautical chart rock is recorded by its own abbreviation among the soundings, describing a hard seabed that offers poor anchor holding and can damage gear.
Records that the seabed at that point is rock.
Contexts: Navigation
Warns of poor holding and of risk to anchors and trawls, so the abbreviation carries a caution the others do not.
Contexts: Navigation
A short lower-case abbreviation in letters printed beside a sounding.