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Glossary of Marine Terms H-M

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Marine terms, ship construction, dockyard, ship terms hard aground, hatch battens beam, hatchway, hawse pipe, hawser, heel, helm, hogging, hoisting rope, hold, hull, inert gas system, intercoastal, intercostal, international load line certificate tonnage waterways, intracoastal, keel blocks flat plate, knee beam, knot, l/t, laker, lash, length between perpendiculars overall, lifeboat, light weight, lighters aboard ship, limber hole, liner, lines plan, list, lng carrier, load line waterline, long ton, longitudinals, m.v., m/t, main deck, margin bracket, margin line, mast, masthead light, metacenter, metacentric height, midship section, mold loft, mooring, mooring line, multipurpose ship

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Marine and Naval Architecture terms have special meaning. Persons studying ship construction, working on board ship, or dockyard will find these pages useful.

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HARD AGROUND A ship which has gone aground and is not able to move under her own power.
HATCH BATTENSFlat bars which are wedged against hatch coamings to secure tarpaulin
HATCH BEAMPortable beam across a hatch to support hatch covers
HATCH OR HATCHWAYAn opening in a deck through which cargo and stores are loaded or unloaded
HAWSE PIPETube through which anchor chain is led overboard from the windlass on the deck
HAWSERStrong rope or steel cable used for securing or mooring ships
HEELThe inclination of a ship to one side (See list)
HELMSteering wheel installed on the bridge or wheelhouse of a ship to turn the rudder during manoeuvering and navigation
HOGGINGStraining of the ship that tends to make the bow and stern lower than the middle portion (See Sagging)
HOISTING ROPEFlexible wire rope for lifting purposes, generally being of six strands with 19 wires in each strand and in most cases having a hemp rope at the center. Also called wire rope
HOLDThe large spaces below deck for the stowage of cargo
HULLBody of a ship which floats on the water
INERT GAS SYSTEMA system of filling the space above the cargo oil in tankers with carbon dioxide from the boiler exhaust so as to prevent explosion.
INTERCOASTALDomestic shipping routes serving more than one coast.
INTERCOSTALMade in separate parts; between floors, frames or beams, etc; the opposite of continuous
INTERNATIONAL LOAD LINE CERTIFICATE A certificate issued after the vessel has been surveyed and load lines marked on her sides.
INTERNATIONAL TONNAGE CERTIFICATE A certificate issued by a government department in accordance with the International Convention of Tonnage Measurement of Ships stating the gross and net tonnages
INTERNATIONAL WATERWAYSInternational straits, inland and interocean canals and rivers separating the territories of two or more nations which are can be navigated by both merchant ships and warships with no restrictions
INTRACOASTALDomestic shipping routes along a single coast.
KEELThe principal fore-and-aft component of a ship's framing located along the centerline of the bottom and connected to the stem and stern frames
KEEL BLOCKSHeavy wood or concrete blocks on which ship rests during construction or drydocking
KEEL, FLAT PLATEThe horizontal, centerline, bottom shell strake constituting the lower flange of the keel
KNEE, BEAMBracket between a deck beam and frame
KNOTUnit of speed in nautical mile (6,080 feet or 1,852 meters) per hour.
L/TLong tons (2,240 lbs.).
LAKERType of ship which trades only in the Great Lakes of North America. The cargo is usually grain and ore.
LASHLighter Aboard Ship: A ship designed to carry floating containers or lighters.
The length of a ship between the forward and after perpendiculars
LENGTH, OVERALLThe extreme length of a ship measured from the foremost point of the stem to the aftermost part of the stern
LIFEBOATA boat which is used when the ship is in danger and has to be abandoned
LIGHT WEIGHT(See Displacement, light)
LIGHTERA flat-bottomed boat for transporting cargo between ship and shore.
LIGHTERSSmall barges for carrying cargo between ship and shore
LIMBER HOLEA small drain hole or slot in a frame or plate for the purpose of preventing water or oil from collecting
LINERA cargo ship which sails between regular ports of call on a schedule
LINES (PLAN)The plans that show the shape or form of the ship
LISTWhen the centerline plane of a ship is not vertical, the ship is said to list, or to heel
LNG CARRIERLiquefied natural gas carrier.
LOAD LINEThe line on a ship which indicates the maximum depth to which it can sink when loaded with cargo. Also known as marks.
LOAD WATERLINEThe line on the lines plan of a ship, representing the intersection of the ship's form with the plane of the water surface when the ship is floating at the summer freeboard draft or at the designed draft. Also called marks
LONG TON2,240 pounds.
LONGITUDINALSFore-and-aft structural shape or plate members attached to the underside of decks, flats, or to the inner bottom, or on the inboard side of the shell plating.
LPGLiquefied Petroleum Gas
M.V.Motor Vessel or Diesel Engine driven ship
M/TMetric tons (2,250 lbs.).
MAIN DECKThe continuous deck of a ship running from fore to aft. The freeboard is measured from this deck.
MARGIN BRACKETA bracket connecting a side frame to the margin plate at the bilge
MARGIN LINEA line, not less than 3 in below the top of the bulkhead deck at side, defining the highest permissible waterplane in the final condition of sinkage, trim and heel
MASTA tall vertical or raked structure, usually of circular section, located on the centerline of a ship and used to carry navigation lights, radio antennas and cargo booms
MASTHEAD LIGHTA white light situated on the fore and aft centerline of a ship
METACENTERThe intersection point of a vertical line drawn through the line of buoyancy of a slightly listed vessel which intersects the centerline plane
METACENTRIC HEIGHTThe distance from the metacenter to the center of gravity of a ship. If the center of gravity is below the metacenter the vessel is stable
MIDSHIP SECTIONA drawing showing a typical cross section of the hull and superstructure at or near amidships and giving the scantlings of the principal structural members
MOLD LOFTA floor space used for laying down the full size lines of a ship for making templates for construction
MOORINGSecuring a ship at a dock or elsewhere by ropes or cables
MOORING LINEA cable or rope used in securing a ship
MULTIPURPOSE SHIPA ship designed for carrying different types of cargoes requiring different methods of handling. See OBO ship

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