A civilian officer or sailor who serves in the merchant marine. Sometimes such personnel are incorrectly called 'merchant marines,' but both merchant mariners and marines frown on this term; although merchant mariners are part of the merchant marine, they are civilians and are not in any way marines , which are a specialized type of military personnel.

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A movement of a vessel through the water such as headway, sternway or leeway.


Intentional transmission or re-radiation of radio signals in such a way as to interfere with reception of desired signals by the intended receiver.


Sailing with the wind coming from the starboard side of the vessel. Has right of way over boats on port tack.


A way of loading cargo into large barges and then in turn loading the barges into a ship.


A crane on a ship which hold the lifeboat. It is constructed in such a way as to lower and lift the lifeboat the easiest way possible and are also unobstructed in case of an emergency.


The abbreviation for 'just in time,' which is a way to minimize warehousing costs by having cargo shipped to arrive just in time for its use. This inventory control method depends on extremely reliable transportation.


1. Departure from the strict characteristics of the type, pattern, scheme, etc. 2. An angle used in the mathematical description of the orbit of one body about another. It is the angle between the radius vector of the body and the line of apsides and is measured from pericenter in the direction of motion. When the radius vector is from the center of the primary to the orbiting body, the angle is called true anomaly. When the radius vector is from the center of the primary to a fictitious body moving with a uniform angular velocity in such a way that its period is equal to that of the actual body, the angle is called mean anomaly. When the radius vector is from the center of the elliptical orbit to the point of intersection of the circle defined by the semimajor axis with the line perpendicular to the semimajor axis and passing through the orbiting body, the angle is called eccentric anomaly or eccentric angle. 3. Departure of the local mean value of a meteorological element from the mean value for the latitude.


A lock between the tideway and an enclosed basin when their water levels vary. By means of the lock, which has two sets of gates vessels can pass either way at all states of the tide. Also called TIDAL LOCK.


An access way in a deck, with a ladder leading below, for the use of the crew


A series of tubes located in the path of flue gases. Feedwater is pumped through these tubes on its way to the boiler in order to absorb waste heat from the flue gas.

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