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STEM /BOWForward part of a ship

STERNAft part o f a ship

PORT SIDEThe left-hand side of a ship when facing the front or forward end

STARBOARD SIDEThe right-hand side of a ship when facing the front or forward end. The starboard

side of a ship during darkness is indicated by a green light.

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INBOARDA term to signify in the ship

OUTBOARDA term to signify out of the ship

LENGTH OVERALL (L.O.A)

Distance from extreme ford to extreme aft end

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t

b

dLWL

LWL

FPAP

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LENGTH OF WATER LINE (L.W.L)Is the distance of water line from stem to stern

FORWARD PERPENDICULAR (F.P)Perpendicular at intersection of LWL and stem

AFT PERPENDICULAR (A.P)

Perpendicular at intersection of LWL and rudder postor

Perpendicular through C.L of rudder stock if no rudder POST

Where LWL is load water line

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LENGTH BETWEEN PERPENDICULAR (L.B.P)

Length between F.P and A.P

SUMMER LOAD WATERLINEThe deepest waterline to which the ship is allowed to load

Design draft

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MIDSHIP

Is the section midway between perpendiculars

MOULDED BREADTH

Breadth measured amid ship below the weather deck

BREDTH EXTREMEMoulded breadth + shell plating + fender

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MOULDED DRAFT (T)Vertical distance from top of the flat keel to design waterline

MOULDED DEPTH (D)Vertical distance from top of flat keel to underside of the Uppermost continuous

deck plating

FREEBOARDIs the difference between depth and draft

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TRIMSinkage of ship in longitudinal direction

HEEL

Sinkage of the ship in transverse direction

LISTPermanent heel

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RISE OF FLOORThe distance above the keel that a tangent to the bottom Cuts the line of

maximum beam midship

TUMBLE HOMETendency of a section to fall in towards the middle line plane From the vertical as it

approaches deck side

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DECK CAMBER

Is the curve applied to the deck transversely

FLARETendency of a section to fall out of the middle line plane from

the vertical as it approaches deck side

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SHEERTendency of a deck to rise above the horizontal in profile

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RAKE

Departure from vertical of any profile

Rake A departure from the vertical or horizontal of any profile, defined by a rake angle or

by the distance between the profile line and a reference line at a convenient point. Rakeof stem, for example, can be expressed as the angle between the stem bar and the

forward perpendicular. Ships designed so that the keel is not parallel to the baseline and

DWL when floating at their designed drafts are said to have raked keels, or to have drag

by the keel.

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ENTRANCEForward part of the ship having varying cross section

RUNAft part of the ship having varying cross section

PARALLEL MIDDLE BODYMiddle part of the ship having constant cross section

DISPLACEMENTWeight of the ship in the floating condition

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TERMINOLOGY

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BODY PLANA plan consisting of two half transverse elevations or end views of a ship, both

having a common vertical center line, so that the right-hand side represents the shipas seen from ahead, and the left-hand side as seen from astern.

BUTTOCK LINESThe curves shown by taking vertical longitudinal sections of the after part of a ship's

hull parallel to the ship's keel. Similar curves in forward part of hull are "bow lines".

HALF-BREADTH PLANA plan or top view of one-half of a ship divided by the middle vertical plane.

GUNWALEA term applied to the line where a weather deck stringer intersects the shell.

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APPENDAGES Structures extending beyond the main hull. Theyinclude items like shafting, rudder, bossing

ASTERN A backward movement of a vessel

ATHWARTSHIP Across the ship, at right angles to the fore-and-aftcenterline

BEAM The width of a ship. Also called breadth.

BILGE KEELA long longitudinal fin fitted on the curved of a ship

at the turn of the bilge to reduce rolling

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BILGE A recess area fitted at the curved section betweenthe bottom and the side into which water drains fromholds or other spaces

BILGE BRACKET A vertical transverse flat plate welded to the tank topor margin plate and to the frame in the area of the

bilge.

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BOW THRUSTERS A propeller at the bow of the ship, used during

maneuvering to provide transverse thrust

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BRIDGE, NAVIGATING The command post of a ship.

BREASTHOOK A triangular plate bracket joining port and starboardside stringers at the stem.

BULKHEAD

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BULKHEADVertical partition walls which separates the interior of

a ship into compartments or rooms

BULKHEAD DECK The uppermost deck to which the transversewatertight bulkheads are carried

BULKHEAD, AFTERPEAK First main transverse bulkhead forward of thesternpost

BULKHEAD,

COLLISION ORFOREPEAK

The foremost main transverse watertight bulkhead

designed to keep water out of the forward hold in

case of bow collision damage

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CAPSTAN A stump with a vertical axis used for handlingmooring and other lines

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CENTER GIRDER A vertical plate on the ship's centerline between theflat keel and inner bottom extending the length of

the ship. Also called center vertical keel, CVK. Or

center keelson.

CHAFING PLATE Bent plate for minimizing chafing of ropes

CHAIN LOCKER A compartment for the stowage of anchor chain

CLASSIFICATIONSOCIETY Independent and reputable organizations whichverifies and inspects vessels for seaworthiness. As

technical experts, they serve to provide the necessary

basis for adjusting insurance rates for the vessel

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CHOCK

A heavy smooth-

surfaced fitting usually

located near the edge of

the weather deckthrough which wire ropes

or fiber hawsers may be

led, usually to piers

COAMING, HATCH The vertical plating bounding a hatch for the purposeof stiffening the edges of the opening and resisting

water entry

CO

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DAVIT A crane arm for handling lifeboats, stores, etc.

COFFERDAM Narrow void space between two bulkheads or floors

DEADWEIGHT It is the difference in weight between a vessel whenit is fully loaded and when it is empty measured by

the water it displaces. Or The amount of a ship's

carrying capacity

DECK A platform in a ship corresponding to a floor in abuilding

DECK, WEATHER Uppermost continuous deck and having no overheadprotection having watertight openings

DECK, FREEBOARD Deck to which freeboard is measured

MAIN DECK

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MAIN DECKThe principal deck of the hull, usually the highest extending from stem to stern and

providing strength to the main hull.

POOPThe structure or raised deck at the after end of a vessel.

SUPERSTRUCTUREA structure built above the uppermost complete deck; a pilot house, bridge, galley

house, etc.

DECK HOUSE Small superstructure on the top deck which containsthe steering wheel and other navigational

instruments.

DISPLACEMENT LIGHT The displacement in tons of the ship complete with all

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DISPLACEMENT, LIGHT The displacement in tons of the ship complete with alloutfit, equipment, and machinery on board but

excluding all fuel, water in tanks, cargo, stores,

passengers, and the crew and their effects. The light

condition displacement includes the lubricating oil for

the machinery and water in the boilers at steaminglevel. Also called light weight.

DISPLACEMENT, LOADED The displacement of a ship when floating at hergreatest allowable draft

DOUBLE BOTTOM Compartments at the bottom of a ship between innerbottom and the shell plating, used for fresh water,ballast water, fuel oil, etc

DRAFT The depth of the ship below the waterline measuredvertically to the lowest pa