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A minimum sounding chosen for a vessel of specific draft in a given area to indicate the limit of safe navigation



Related Terms

DANGER LINE

  1. A line drawn on a chart to indicate the limits of safe navigation for a vessel of specific draft

CARGO TRANSSHIPMENT AREA

An area generally outside port limits that is specifically designated as suitable for the transshipment of oil or other materials from large ships to smaller ones. As the purpose of transshipment is usually to reduce the draft of the larger vessel to allow her to proceed to port, the operation is often known as lightening and the area may be called lightening area or cargo transfer area

PLIMSOLL LINE

A special marking, positioned amidships, that indicates the draft of the vessel and the legal limit to which the vessel may be loaded for specific water types and temperatures.

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.

F.W.A.

Fresh water allowance. The number of millimetres by which the draft changes when a vessel moves from fresh to salt water.

PROBABILITY AREA

The area in which a missing craft and/or survivors are most likely to be found taking into account possible errors in the navigation of the missing craft and of the search craft.

USDV

Ultra Shallow Draft Vessel

ANCHORAGE MARK

A navigation mark which indicates an anchorage area or defines its limits

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.

DEADWEIGHT

The total weight in tons (2240 lb.) that a ship carries on a specified draft including fuel, water in tanks, cargo, stores, passengers, baggage, crew and their effects, but excluding the water in the boilers. It is the difference in weight between a vessel when it is fully loaded and when it is empty measured by the water it displaces.

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