1. A cluster of pilings to which a boat or barge ties up.
  2. An independent platform incorporating mooring hooks or bollards for securing ship's mooring lines. It may also incorporate mooring fenders such as breasting dolphins.

Related Terms


The minimum breaking load of new dry mooring lines for which a ship's mooring is designated to meet OCIMF standard environmental criteria restraint requirements.

Ship Design MBL equals to Highest individual mooring line restraint requirement in service divided by number of mooring lines.


A stump with a vertical axis used for handling mooring and other lines


A cable or rope used in securing a ship


A mooring line led from the vessel to the shore and then back to the vessel. It can be let go and retrieved from on board the vessel as it departs.


Actual Time of Sailing-Can refer to the Last Line time (the time the last mooring line is let go from shore or can in some case refer to the time the vessel departed the port limits.


The time recorded when the last mooring line attaching the vessel to the pier, terminal, or mooring is let go and brought aboard. The official time the vessel left the berth, pier or mooring.


A winch with which you can set a specific tension and it will maintain this tension and pay out line if the set tension is exceeded, therefore avoiding the parting of a towing hawser, or mooring line under excess strain.


Singling up means all the lines are released except for a single line from the ship to the pier is still attached in each mooring line position. Singling up is done just before letting go all the lines.

  1. Wait for the orders from the bridge.
  2. When received orders from the bridge then let go all head lines except 1 and all spring lines except 1. Usually, lines on drums are kept on for singling up.
  3. Inform bridge about casting of the mooring lines.
  4. Pick up the mooring lines.
  5. When the casted off lines are on board, inform bridge.
  6. Inform bridge about holding the station on one plus one.
  7. Disengage the required gears of the mooring drum.
  8. Engage the gears of the mooring drum of whose mooring ropes are still made fast on the jetty.


Letting go the lines means casting off all the mooring lines for a departure of the ship.

  1. Wait for the orders from the bridge.
  2. Engage the gears of the required drum.
  3. On receiving the order release the brake slowly of that particular drum.
  4. Then let go all the lines.
  5. On casting off inform the bridge.
  6. Heave the lines to bring them on board and inform the bridge that all lines are on board.


A special shackle used to connect a wire mooring line to a synthetic tail.

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