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An abbreviation marking mud on the seabed.
Also known as: Mud seabed abbreviation, Bottom quality mud
On a nautical chart mud is recorded by its own abbreviation among the soundings, describing a soft seabed of fine sediment.
Records that the seabed at that point is mud.
Contexts: Navigation
Generally offers good holding for an anchor, unlike rock, which is why the abbreviations are read together with the anchorage symbols.
Contexts: Navigation
A short lower-case abbreviation in letters printed beside a sounding.