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The following are some of the terms and definitions, which may prove helpful in the daily dealings with oil tankers. This list is compiled from various industry sources. While extensive, it should not be considered a complete list of all vessel and charter party related terms and definitions.
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Marine Surveyor - A duly qualified person who examines ships to ascertain their condition, on behalf of owners, underwriters, etc. Also called "ship surveyor" or simply "surveyor".

Maritime Law - That system of jurisprudence that prevails in courts having jurisdiction of marine causes. Also called marine or admiralty law. It is a branch of both international and commercial law.

Mean Draft - The average of the drafts measured at the bow and the stern.

Metric Ton - A unit of weight 2,204.6 pounds (1,000 kilograms).

Midship Draft - The draft read at the midship markings. This draft can, and often does, differ from the Mean Draft due to hogging or sagging.

Molded Breadth - The breadth of the hull at the widest part, measured between the outer surfaces of the frames.

Molded Depth - The depth measured between the top of the keel, or lower surface of the frame at the center line, and top of the upper deck beam at the gunwale.

Mooring Line - Any hawser by which a vessel is secured to a dock or mooring. It may be made of natural materials (manila), synthetics, (polypropylene), or wire. Under certain circumstances the anchor chain is detached from the anchor and a section of that is used to secure the vessel.