A vessel sunk deliberately to block a waterway to prevent the waterway╩╣s use by an enemy.



Related Terms

HARBOUR

Protected waterway suitable for vessel mooring.

FOUL

  1. Having freedom of motion interfered with by collision or entanglement; entangled; the opposite of clear. For instance, a rope is foul when it does not run straight or smoothly, and an anchor is foul when it is caught on an obstruction.
  2. A breach of racing rules.
  3. An area of water treacherous to navigation due to many shallow obstructions such as reefs, sandbars, or many rocks, etc.
  4. Foul the range: To block another vessel from firing her guns at a target.

BLOCK COEFFICIENT

The ratio of the underwater volume of a ship to the volume of a rectangular block with the same effective lengths, draft and beam

TWENTY FOOT EQUIVALENT UNIT

A unit of measurement equal to the space occupied by a standard twenty foot container. Used in stating the capacity of container vessel or storage area. One 40 ft. Container is equal to two TEU's.

BOW LINES

The mooring lines extending from the foremost part of a vessel to the shore usually leading forward preventing movement astern.

BACK SIPHONAGE

The flowing back of used, contaminated, or polluted water from a plumbing fixture or vessel into the pipe which feeds it; caused by reduced pressure in the pipe.

INCINERATION AREA

An officially designated offshore area for the burning of chemical waste by specially equipped vessels. The depiction of incineration areas on charts (in conjunction with radio warnings) is necessary to insure that passing vessels do not mistake the burning of waste for a vessel on fire.

MOLDED_DEPTH

The vertical distance from the molded baseline to the top of the freeboard deck beam at side, measured at midlength of the ship

CONDUCTIVITY CELL

A glass vessel with two electrodes at a definite distance apart and filled with a solution whose conductivity is to be measured.

MOORING LINE

A cable or rope used in securing a ship

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