• Safe speed - That speed of a vessel allowing time for effective action to be taken under prevailing circumstances and conditions to avoid a collision and to be stopped within an appropriate distance

  • SWL - Safe working load: maximum working load of lifting equipment that should not be exceeded

  • Safe working pressure - The maximum permissible pressure in cargo hoses

  • SAR - Search and Rescue

  • SART - Search and Rescue Transponder

  • Scene - The area or location where the event, e.g. an accident, has happened

  • Search pattern - A pattern according to which vessels and/or aircraft may conduct a co-ordinated search (the IMOSAR offers seven search patterns)

  • Search speed - The speed of searching vessels directed by the OSC

  • Seamark - A navigational aid placed to act as a beacon or warning

  • Segregation(of goods) - Separation of goods which for different reasons must not be stowed together

  • Shackle .1 - Length of chain cable measuring 15 fathoms

  • Shackle .2 - U-shaped link closed with a pin used for connecting purposes

  • Shifting cargo - Transverse movement of cargo, especially bulk cargo, caused by rolling or a heavy list

  • Slings - Ropes, nets, and any other means for handling general cargoes

  • Speed of advance - The speed at which a storm centre moves

  • Spill - The accidental escape of oil, etc., from a vessel, container, etc., into the sea

  • Spill control gear - Anti-pollution equipment for combating accidental spills of oils or chemicals

  • Spreader - step of a pilot ladder which prevents the ladder from twisting

  • Stand by (to) - To be in readiness or prepared to execute an order; to be readily available

  • Stand clear (to) Here - to keep a boat away from the vessel

  • Standing orders - Orders of the Master to the officer of the watch which he/she must comply with

  • Stand on (to) - To maintain course and speed

  • Station - The allotted place or the duties of each person on board

  • Stripping - Final pumping of tank’s residues

  • Survivor - A person who continues to live in spite of being in an extremely dangerous situation, e.g. a shipping disaster.

  • Take off (to) - To lift off from a vessel's deck (helicopter)

  • Target - The echo generated, e.g. by a vessel, on a radar screen

  • Tension winch - A winch which applies tension to mooring lines to keep them tight

  • TEU - Twenty Foot Equivalent Unit (standard container dimension)

  • Track - The path followed, or to be followed, between one position and another

  • Transit Here - the passage of a vessel through a canal, fairway, etc.

  • Transit speed - Speed of a vessel required for passage through a canal, fairway, etc.

  • Transhipment (of cargo) Here - the transfer of goods from one vessel to another outside harbours

  • Underway - Describes a vessel which is not at anchor, or made fast to the shore, or aground

  • Union purchase - A method of cargo handling by combining two derricks, one of which is fixed over the hatch, the other over the ship’s side

  • Unlit - When the light of a buoy or a lighthouse are inoperative

  • UTC - Universal Time Co-ordinated (GMT)

  • Variable (of winds) - A wind that is constantly changing speed and direction

  • Veering (of winds) - Clockwise change in the direction of the wind; opposite of backing

  • Veer out (to)(of anchors) - To let out a greater length of cable

  • VHF - Very High Frequency (30-300 MHz)

  • Walk out (to) (of anchors) - To reverse the action of a windlass to lower the anchor until it is clear of the hawse pipe and ready for dropping

  • Walk back (to) - To reverse the action of a windlass to ease the cable (of anchors)

  • Waypoint - A position a vessel has to pass or at which she has to alter course according to her voyage plan

  • Windward - The general direction from which the wind blows; opposite of leeward

  • Wreck - A vessel which has been destroyed, sunk or abandoned at sea

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