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To direct a ship or submarine from a position of command. While performing this duty, an officer is said to have the conn.

Related Terms


A notebook in which the commanding officer of a ship writes orders with respect to courses and speeds, any special pre- cautions concerning the speed and navigation of the ship, and all other orders for the night for the officer of the deck.


A type of radarscope display in which own ship and other moving targets move on the plan position indicator in accordance with their true courses and speeds. All fixed targets appear as stationary echoes. However, uncompensated set and drift of own ship may result in some movement of the echoes of stationary targets. This display is similar to a navigational (geographical) plot.


Is the person on board the vessel, accountable to the master, designated by the Company as responsible for the security of the ship, including implementation and maintenance of the ship security plan and for the liaison with the company security officer and the port facility security officers.


The list prepared by the master of a ship showing the full names, nationality, passport or discharge book number, rank and age of every officer and crew member engaged on board that ship and is one of the essential ship's documents presented to the customs and immigration authorities on arrival at a new port.


The ability of a ship to return to her normal upright position when listed by the action of waves, wind, etc.


An acoustic system used in offshore oil drilling to provide continuous information on ship position with respect to an ocean-floor acoustic beacon transmitting an ultrasonic signal to three hydrophones on the bottom of the drilling ship.


The officer in the deck department next in rank to the master; second in command of a ship. He is next to the master, most especially in the navigation and as far as the deck department is concerned. The chief mate assumes the position of the Master in his absence.


A radar transmitter whose emissions enable a ship to deter- mine its direction and frequently position relative to the transmitter using the ship’s radar equipment. There are two general types of radar beacons: one type, the RACON, must be triggered by the ship’s radar emissions; the other type, the RAMARK transmits continuously and provides bearings only.


A plot of the successive positions of a craft relative to a reference point, which is usually in motion. A line connecting successive relative positions of a maneuvering ship relative to a reference ship is called a RELATIVE MOVEMENT LINE. A relative plot includes relative movement lines and the position of the reference ship.


Extension boarding at deck level to increase the width of the hull of a sailing ship for the lower stays land upon, thus providing a wider angle of mast support. The traditional position from which a seaman heaved a hand lead line (to establish depth).

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