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In the IMO framework, abandonment refers to the orderly process of evacuating and leaving a ship when conditions on board make remaining unsafe, addressed in SOLAS regulation II-2/22 (ship's orderly evacuation and abandonment) and its supporting interpretive notes on assessing a passenger ship's capability after a fire or flooding casualty. The term is also engaged in damage-assessment guidance, such as the early evaluation of hull damage that may indicate a need to abandon a bulk carrier. Separately, in maritime labour law the word describes a shipowner's failure to support a crew, leaving seafarers without pay, provisions, or repatriation, a situation now covered by the financial-security requirements of the Maritime Labour Convention. IMO-grounded

An able-bodied seaman is an experienced unlicensed member of a ship's deck department, qualified to perform the full range of deck duties including standing watch as helmsman and lookout, mooring, cargo handling, and routine maintenance of the deck and its equipment. The rating typically requires a defined period of documented sea service plus survival-craft and safety certification, and ranks above an ordinary seaman. Training and certification standards for the role are framed internationally under the STCW Convention.

Any operating state of a ship's machinery, system, or structure that deviates from its intended or designed normal range, signalling a fault, an incipient failure, or an unsafe situation requiring attention. Detection of such conditions is the basis of alarm and monitoring systems, which alert the crew so corrective action can be taken before the deviation escalates into damage or a hazard.

The progressive wearing away of a material's surface through mechanical friction, rubbing, scraping, or the impact of moving particles. On board it commonly affects coatings, hull surfaces, deck plating, and moving mechanical parts, and is a significant factor in corrosion protection and maintenance, since loss of a protective layer exposes the underlying metal.

The ability of a material or coating to withstand surface wear from friction, rubbing, or particle impact without significant loss of material or protective function. It is an important property for marine paints, deck coverings, and cargo-hold linings, where surfaces are repeatedly exposed to mechanical wear from cargo, equipment, and foot traffic.

A hard material, used as grains, powder, or a bonded tool, that wears down, shapes, cleans, or smooths a softer surface through friction. In ship repair and maintenance, abrasives are central to surface preparation, for example removing rust, scale, and old paint from steel before a new protective coating is applied.

A surface-preparation process in which abrasive particles are propelled at high velocity, usually by compressed air, against a surface to strip away rust, scale, old coatings, and contaminants and to create a roughened profile that improves adhesion of a new coating. It is the standard method for preparing steel during shipbuilding and repair, and because it generates hazardous dust the work is subject to occupational health and safety precautions.

Any substance designed to soak up and retain liquids, used on board principally to contain and clean up oil, fuel, and chemical spills. Such materials form part of a ship's pollution-prevention and spill-response equipment, helping limit the spread of a spill and prevent discharge into the sea.

The rate of change of velocity of a body with respect to time. In a marine context it characterises the motions a ship and its contents experience in a seaway (heave, roll, pitch and the associated linear and angular accelerations), which influence cargo securing, structural loads, equipment mounting, and crew comfort and safety.

An instrument that measures acceleration along one or more axes. Aboard ship, accelerometers monitor vessel motions and vibration, supporting applications such as motion measurement for cargo and crew safety, machinery condition monitoring, and stabilisation and navigation systems.

The formal trials carried out on a newly built or repaired ship, or on a major item of equipment, to verify that it meets the contractual specification and the required performance standards before it is accepted by the owner. They typically cover speed, manoeuvring, machinery, and system functionality under defined conditions.

The degree to which spaces, structures, tanks, and machinery on a ship can be reached safely for inspection, maintenance, repair, and emergency response. Adequate access is a design and survey consideration, particularly for enclosed spaces and structural areas that must be examined during periodic surveys.

The spaces on a ship provided for the living needs of the crew and any passengers, including cabins, mess rooms, sanitary facilities, and recreation areas. Standards for crew accommodation, covering size, ventilation, lighting, heating, and sanitary provision, are set internationally under the Maritime Labour Convention. IMO-grounded

A movable stairway rigged over a ship's side to give safe access between the deck and a quay or a boat alongside. Its construction, rigging, and safe use, together with gangways, are subject to international requirements for means of embarkation and disembarkation under SOLAS. IMO-grounded

A safety test of a steam boiler in which the safety valves are checked under maximum firing to confirm they can relieve steam fast enough to prevent pressure from rising more than a permitted amount above the working pressure, with the stop valve closed. It verifies the relieving capacity of the valves.

A highly flammable hydrocarbon gas (C2H2) used aboard with oxygen for gas welding and cutting. Because it is unstable under pressure and forms explosive mixtures with air, its storage, handling, and use are tightly controlled by safety precautions.

In ship operation and commerce, the act of obtaining ownership of a vessel, company, or asset. In a sensor or radar context, acquisition is the process by which a target is detected and selected for tracking.

A natural event of an extraordinary and unforeseeable character, such as a severe storm or earthquake, that could not be guarded against by reasonable care. In marine law and insurance it may relieve a party of liability for loss or damage that results from it.

Corrosion that is currently progressing on a metal surface, as distinct from corrosion that has been arrested or passivated. Identifying active corrosion is important during survey and maintenance because it indicates ongoing loss of material that requires treatment.

A control system, used mainly on offshore cranes and drilling equipment, that actively counteracts the vertical motion (heave) of a vessel in a seaway so that a suspended load or tool stays at a steady position relative to the seabed or a target. It uses motion sensors and powered winch or cylinder control to cancel the ship's movement.

Retractable fins fitted to a ship's hull that are tilted automatically by a control system to generate hydrodynamic forces opposing roll, reducing the vessel's rolling motion while underway. They are a common form of roll stabilisation on passenger ships and yachts.

A device that converts a control signal, hydraulic, pneumatic, or electrical, into mechanical motion to operate a valve, damper, steering gear, or other mechanism. Actuators are fundamental components of a ship's remote and automatic control systems.

A trademarked aqueous urea solution injected into the exhaust of diesel engines fitted with selective catalytic reduction (SCR) systems, where it reacts to convert nitrogen oxides into nitrogen and water. It supports compliance with engine emission limits.

The additional effective mass attributed to a body moving through water, representing the inertia of the surrounding water that must be accelerated with the body. It is an important factor in calculating a ship's motions, vibration, and manoeuvring behaviour.

Substances blended in small quantities into fuels, lubricating oils, paints, or other fluids to improve or modify their properties, such as detergency, anti-wear performance, corrosion inhibition, or stability.

The strength with which a paint or protective coating bonds to the surface beneath it. Good adhesion, which depends heavily on proper surface preparation, is essential for the coating to protect the substrate against corrosion over its intended life.

A substance used to bond two surfaces together. In shipbuilding and outfitting, adhesives are used for joining insulation, deck coverings, panels, and composite components.

Describing a thermodynamic process in which no heat is transferred to or from the working fluid. The concept is used in analysing the compression and expansion processes within engines, compressors, and turbines.

The official measurement of a ship to determine its tonnage and principal dimensions for registration and regulatory purposes. The rules for measuring gross and net tonnage are set internationally under the Tonnage Convention. IMO-grounded

In IMO instruments, the Administration means the government of the State whose flag the ship is entitled to fly, which is responsible for implementing and enforcing the convention requirements on its ships, including survey and certification. IMO-grounded

An empirical coefficient used in a simple formula to estimate the power required to drive a ship at a given speed from its displacement and speed, allowing rough comparison of similar vessels. It is an approximate, traditional tool rather than a precise design method.

Said of a vessel or object floating freely without being moored, anchored, or under control, at the mercy of wind and current.

A material that holds molecules of a gas or liquid on its surface by adsorption, used for example to dry compressed air or to remove contaminants. It differs from an absorbent, which takes substances into its bulk.

The adhesion of molecules of a gas, liquid, or dissolved substance to the surface of a solid or liquid, forming a thin film. It is exploited in air dryers and filtration on board.

In ship manoeuvring, the distance a vessel travels in the direction of its original course measured from the point where the rudder is put over to the point where the heading has changed by a given amount during a turn. It is a standard measure of turning ability.

The state of a vessel or object being supported by and floating on water rather than aground or in dry dock.

A class of medium-sized crude oil tanker, broadly in the range of about 80,000 to 120,000 deadweight tonnes, named from the Average Freight Rate Assessment tanker-rate system. Their size suits trades and ports that cannot accommodate the largest tankers.

The compartment at the extreme stern of a ship, abaft the aftermost main transverse bulkhead, usually used as a tank and often housing the stern tube and steering gear arrangements.

The aftermost main transverse watertight bulkhead of a ship, which forms the forward boundary of the aft peak and provides watertight subdivision at the stern. Its provision is a requirement of subdivision rules under SOLAS. IMO-grounded

The tank formed in the aft peak space at the stern, commonly used to carry water ballast or fresh water and to assist in trimming the vessel.

A vertical reference line, conventionally at the after side of the rudder post or at the centre of the rudder stock, used together with the forward perpendicular to define a ship's length between perpendiculars for design and calculation.

See aft peak bulkhead: the aftermost main transverse watertight bulkhead forming the forward boundary of the after peak, required for watertight subdivision at the stern under SOLAS. IMO-grounded

The region of a ship's hull where the parallel middle body curves inward toward the stern, forming the aft shoulder of the waterline.

The portion of a ship's hull aft of amidships, whose form strongly influences flow into the propeller, resistance, and propulsive efficiency.

The condition of a vessel whose hull is resting on or touching the seabed or shore, whether deliberately (beaching) or accidentally (stranding/grounding).

Charted external devices and marks, such as buoys, beacons, lights, fog signals, and radio or electronic aids, established to assist mariners in fixing position, following safe channels, and avoiding dangers. Their provision and standardisation are coordinated internationally, and carriage of related shipborne systems is governed by SOLAS chapter V. IMO-grounded

A specialised vessel used by a buoy or lighthouse authority to lay, recover, service, and reposition buoys and other navigational marks, typically fitted with a heavy-lift crane and buoy-handling deck equipment.

A machine that raises the pressure of air for shipboard uses such as starting diesel engines, operating pneumatic controls and tools, and charging air receivers. Starting-air systems and their receivers are subject to classification and safety requirements.

An installation that controls the temperature, humidity, cleanliness, and circulation of air in accommodation, control, and other spaces to maintain comfortable and safe conditions for people and, where required, for equipment.

An arrangement for cleaning the charge-air cooler of a diesel engine, removing oil and dirt deposits from the air side to maintain cooling efficiency and engine performance.

A heat exchanger that cools the compressed combustion air delivered by a turbocharger before it enters the engine cylinders, increasing air density and thereby the engine's power output and efficiency.

A craft that rides on a cushion of pressurised air contained by a flexible skirt, enabling it to travel over water and other surfaces with very low contact resistance. As a high-speed craft type it may fall under the IMO High-Speed Craft Code. IMO-grounded

The vertical distance from the waterline to the highest point of a ship, such as the masthead. It determines whether a vessel can pass safely beneath bridges, cables, and other overhead obstructions.

Equipment that removes moisture from compressed air, by refrigeration or by adsorbent media, to protect pneumatic systems and instruments from water damage and corrosion.

A passage or trunk that conveys air for ventilation or air conditioning to and from the spaces it serves.

A device that releases a burst of compressed air. In marine survey work, arrays of air guns are towed to generate acoustic pulses for seismic exploration of the seabed.

A device that warms air, for example to heat accommodation spaces or to preheat combustion air for boilers and engines so as to improve efficiency.

A small intermediate compartment with two self-closing doors that allows people to pass between spaces of different atmospheres, such as into a gas-dangerous space, while preventing the spaces from being directly connected. Air locks are required in certain hazardous-area arrangements. IMO-grounded

A drag-reduction technique in which a layer or carpet of small air bubbles is generated beneath a ship's flat bottom to reduce frictional resistance between the hull and the water, lowering fuel consumption.

A pipe that vents a tank to the atmosphere, allowing air or vapour to escape as the tank is filled and air to enter as it is emptied, while its head and closing arrangements protect against the ingress of water. Air-pipe heights and closures are governed by load-line requirements. IMO-grounded

A pressure vessel that stores compressed air, most importantly the starting air for diesel engines, smoothing supply and providing a reserve. As a pressure vessel it is subject to classification survey and safety-valve requirements.

The aerodynamic drag acting on the above-water part of a ship as it moves through the air, which adds to the total resistance, especially for vessels with large superstructures or deck cargo, and in strong headwinds.

Large vertical or horizontal ducts that carry substantial volumes of air for ventilation, for example to and from machinery spaces and cargo holds.

Paints that cure by reaction with oxygen in the air or by evaporation of solvent at ambient temperature, without the need for added heat. They are widely used for general areas where stoving is impractical.

The mass ratio of air to fuel supplied to an engine's combustion. It strongly affects combustion efficiency, power, fuel consumption, and the formation of exhaust pollutants.

A paint-application method in which paint is forced at high pressure through a small nozzle so that it atomises without compressed air, giving fast application and good film build, widely used for marine coatings.

An audible and/or visual signal that warns the crew of an abnormal or hazardous condition requiring attention, forming part of a ship's monitoring and safety systems. Alarm system requirements are addressed in classification rules and SOLAS. IMO-grounded

A handheld signalling lamp with a trigger-operated shutter, used to send messages in Morse code by flashes of light between ships or between ship and shore.

The correct relative positioning of shafting, bearings, and machinery so that loads are properly distributed and excessive stress, vibration, and wear are avoided, notably in the alignment of the propeller shaft and main engine.

A synthetic resin formed from polyols and fatty acids, widely used as the binder in conventional air-drying marine and decorative paints.

A navigation light that shows an unbroken light over an arc of the horizon of 360 degrees, as defined in the international collision-avoidance rules (COLREGs) and used, for example, for anchor lights. IMO-grounded

A test piece machined entirely from deposited weld metal, used in welding-procedure and consumable testing to determine the mechanical properties of the weld metal itself.

A passage or corridor within a ship's accommodation or working spaces providing access between compartments.

The striking of a stationary object, such as a moored vessel, pier, or fixed structure, by a moving vessel, as distinct from a collision between two moving vessels.

A flux used in welding or brazing that also contributes alloying elements to the joint, helping to protect the molten metal and influence the composition of the deposit.

A bulk-carrier loading arrangement in which cargo is placed in alternate holds, leaving others empty, to achieve a desired draught or trim. Such conditions impose high local loads and are specifically assessed in structural strength and loading requirements for bulk carriers. IMO-grounded

Electric current that periodically reverses direction, the normal form of distribution in most ship electrical systems because it is readily transformed between voltages and suits common motors and generators.

A machine that generates alternating current from mechanical rotation, the usual type of generator providing a ship's electrical power.

Lightweight alloys of aluminium used in shipbuilding for superstructures, fast-craft hulls, and outfit items where weight saving is important; their use requires attention to corrosion (especially galvanic effects with steel) and to fire performance.

A corrosion-resistant copper-zinc alloy containing a small amount of aluminium, used particularly for condenser and heat-exchanger tubes carrying seawater.

A strong, corrosion- and wear-resistant copper alloy containing aluminium, used for items such as propellers, valve and pump components, and bearings.

The surrounding environmental conditions, such as air and sea temperature, humidity, and pressure, against which equipment performance and design ratings are referenced.

The general surrounding conditions in which a ship or its equipment operates, encompassing temperature, humidity, salinity, and exposure that affect materials and performance.

An instrument that measures electric current, fitted in switchboards and control panels to monitor electrical loads.

A pungent compound of nitrogen and hydrogen (NH3) used as a refrigerant and carried as a liquefied gas cargo, and increasingly considered as a low-carbon marine fuel. It is toxic and requires careful handling; its carriage in bulk is governed by the IGC Code. IMO-grounded

The small quantity of unreacted ammonia that passes through a selective catalytic reduction system and escapes with the exhaust gas. It is minimised by careful dosing and catalyst design.

The SI unit of electric current.

An increase in the magnitude of a signal or of a physical response; in naval architecture it can refer to the increase of a ship's motion response near resonance.

The maximum extent of an oscillation or vibration measured from its mean position, for example the amplitude of a ship's roll.

Corrosion that occurs in the absence of free oxygen, often driven by sulphate-reducing bacteria, encountered for example in stagnant ballast water and certain tank or sediment environments.

Electronic or electrical components that handle continuously variable signals, as opposed to digital components that work with discrete values.

A heavy device, connected to the ship by chain cable, that holds a vessel in position by digging into or gripping the seabed. The required number, mass, and strength of anchors and their cables form part of a ship's equipment, set by classification rules. IMO-grounded

A vertical-axis powered rotating drum used to heave in anchor cable or mooring lines, an alternative arrangement to a horizontal windlass.

The chain, made up of standardised links, that connects a ship's anchor to the hull and transmits the holding forces. Its size, grade, and length are determined by the ship's equipment number under classification rules. IMO-grounded

An offshore support vessel designed to tow and position drilling rigs and to handle their anchors, as well as to carry supplies, combining powerful towing winches with cargo capacity.

A recess in the ship's side shell shaped to house the anchor when it is fully hove up, allowing the anchor to stow snugly against the hull.

Trials carried out to demonstrate that the windlass can hoist the anchor and cable at the required speed and hold the design load, confirming compliance with the equipment requirements.

An instrument that measures wind speed, and often direction, used aboard for navigation, cargo operations, and helicopter and crane work.

The angle between the centreline and the tangent to the waterline at the bow, an indicator of the fineness of the forebody that influences wave-making resistance.

The angle of heel at which the lower edge of any opening that cannot be closed weathertight begins to immerse, an important limiting angle in a ship's stability assessment. IMO-grounded

The transverse inclination of a ship from the upright, caused by an external force such as wind, turning, or shifted weight, as distinct from a permanent list.

A steady transverse inclination of a ship resulting from an unsymmetrical distribution of weight or from flooding, as opposed to the temporary heel produced by external forces.

The angle to which a ship with a slightly negative initial stability (a small negative metacentric height) settles and floats steadily heeled to one side, an unstable and hazardous condition requiring careful correction.

The steepest angle, measured from the horizontal, at which a granular or bulk material will rest without sliding. It is significant for the stowage and stability of dry bulk cargoes that may shift, and is addressed in the IMSBC Code. IMO-grounded

A heat treatment in which metal is heated and then slowly cooled to soften it, relieve internal stresses, and improve ductility and machinability.

The presentation of alarm or status indications to operators, typically on a panel that identifies which condition has occurred.

In an electrochemical cell or a corrosion process, the electrode at which oxidation occurs. Sacrificial anodes of a more reactive metal are fitted to hulls and in tanks to protect steel by corroding in its place (cathodic protection).

A protective suit designed to guard the wearer against the effects of cold and immersion, providing thermal protection for those who may have to work or survive in cold conditions. Its provision is among the life-saving requirements of SOLAS and the LSA Code. IMO-grounded

A coating applied to a ship's underwater hull to prevent the attachment and growth of marine organisms that would otherwise increase resistance and fuel consumption. The use of harmful anti-fouling substances is controlled internationally under the AFS Convention. IMO-grounded

Any coating, paint, surface treatment, or device used on a ship to control or prevent the attachment of unwanted marine organisms. The control of harmful anti-fouling systems, and the related survey and certification, are governed by the IMO AFS Convention 2001. IMO-grounded

Systems that automatically transfer ballast water between port and starboard tanks to counteract heel caused by cargo handling or wind, keeping a vessel upright during loading and discharging operations.

A fitting that prevents a hatch cover or similar component from being lifted off its seating by uplift forces, such as those from green seas or internal pressure.

A ring fitted at the top of a diesel engine cylinder liner that scrapes carbon deposits from the piston crown land, preventing bore polishing and the associated increase in lube-oil consumption and wear.

A container-securing arrangement using spacer fittings between stacked containers to limit racking (the parallelogram distortion of a stack) under ship motions, improving the integrity of the stow.

Tanks, partly filled with liquid and tuned so that the liquid's movement lags and opposes the ship's roll, used to reduce rolling. They can be passive or actively controlled.

The general family of systems used to reduce a ship's roll, including bilge keels, active fins, anti-roll tanks, and gyroscopic stabilisers.

A coating system, often applied as a primer beneath other layers, whose primary function is to protect the underlying steel from corrosion. Protective coatings for certain spaces such as ballast tanks are subject to a performance standard required by SOLAS. IMO-grounded

A coating applied to the underwater hull to inhibit marine growth; see anti-fouling paint and anti-fouling system. The substances used are regulated under the AFS Convention. IMO-grounded

Parts of a ship's hull projecting beyond the main fair form, such as the rudder, bilge keels, shaft brackets, propeller bossings, and stabiliser fins, which add to resistance and are accounted for separately in resistance estimation.

Equipment that has been examined and certified by, or on behalf of, the Administration or a recognised organisation as meeting the applicable requirements, for example equipment type-approved for use in hazardous areas or as life-saving or fire-fighting appliances. IMO-grounded

A method of resolving disputes outside the courts, in which the parties agree to submit their dispute to one or more arbitrators whose decision is binding. It is widely used in shipping contracts such as charter parties.

A group of welding processes that use an electric arc between an electrode and the workpiece to generate the heat needed to fuse metal, the predominant method of joining steel in shipbuilding.

A raster (scanned-image) format of official navigational charts produced by a national hydrographic service, displayed on shipboard chart systems as a digital equivalent of the paper chart.

An inert gas used as a shielding gas in certain arc-welding processes to protect the molten weld pool from the atmosphere.

The specific layout and strength of mooring fittings (chocks and bitts) required on a ship's deck to meet the line-handling requirements for passing through the Panama Canal.

The legal detention or seizure of a ship by judicial authority, for example to secure a maritime claim. It is one of the perils and circumstances addressed in marine insurance and shipping contracts.

The condition of a weld or welded structure in the state left after welding, before any subsequent heat treatment or machining.

In shipbuilding, the joining of fabricated parts into larger units, blocks, or sections during construction. The term also refers more generally to a built-up component.

A designated place on board to which persons are mustered in an emergency before proceeding to embarkation or other action, in accordance with the muster and emergency arrangements required by SOLAS. IMO-grounded

A stern whose form is deliberately made unsymmetrical about the centreline to improve the flow into the propeller and recover some of the rotational energy, increasing propulsive efficiency.

An alternating-current motor in which the rotor turns slightly slower than the rotating magnetic field of the stator, the most common and robust type of electric motor used aboard ship.

Directed or extending across the ship from side to side, that is, transverse, as opposed to fore-and-aft.

The breaking up of a liquid, such as fuel or paint, into a fine spray of small droplets, which in fuel injection promotes rapid and complete combustion.

A device, such as a fuel injector or spray nozzle, that atomises a liquid into fine droplets.

Large, multi-deck open public spaces in passenger ships. Because of their size and fire-spread implications, atriums are subject to specific fire-safety provisions under SOLAS chapter II-2. IMO-grounded

The reduction in magnitude of a signal, sound, or vibration as it passes through a medium or a damping device.

A phase of steel, a solid solution of carbon in face-centred-cubic iron, stable at high temperature, whose transformation on cooling governs the microstructure and properties of the steel.

A loose term for a container or carrier arrangement for transporting motor vehicles; more commonly vehicles are carried on dedicated car carriers or ro-ro ships.

Control of a process or machinery by a system that maintains desired conditions without continuous human intervention, using sensors, controllers, and actuators in a feedback loop.

A shipborne broadcast transponder system that automatically exchanges identity, position, course, and speed between ships and with shore stations, enhancing situational awareness and collision avoidance. Its carriage is required by SOLAS regulation V/19 and it must meet IMO performance standards. IMO-grounded

A control system that automatically operates the steering gear to hold a ship on a set heading or track, relieving the helmsman during steady passage. Its performance and use are addressed in SOLAS chapter V and IMO performance standards. IMO-grounded

A radar facility that automatically acquires and tracks targets, computes their course, speed, and closest point of approach, and warns of collision risk. Carriage and performance of such equipment are governed by SOLAS chapter V. IMO-grounded

A mooring winch that automatically pays out or heaves in its line to keep the tension within a set range as the ship moves at the berth with tide and loading, maintaining a safe and steady mooring.

The use of control systems and instrumentation to operate machinery and processes with reduced manual intervention, central to modern reduced-manning machinery spaces, which when unattended must meet specific requirements. IMO-grounded

Shore- or ship-based systems, often using vacuum pads or mechanical arms, that hold a vessel alongside without conventional ropes, allowing rapid, safe berthing and reduced line handling.

Electrically driven blowers that supply combustion air to a turbocharged diesel engine at low load and during starting, when exhaust energy is insufficient to drive the turbocharger adequately.

A boiler that provides steam for shipboard services such as heating, fuel-oil treatment, and domestic needs, as distinct from a main boiler used for propulsion.

The machinery and equipment that support a ship's operation other than the main propulsion plant, including generators, pumps, compressors, purifiers, and steering gear.

A secondary propulsion arrangement that can drive the ship at reduced speed if the main engine fails, for example a motor driving the shaft or a separate thruster, providing a means to reach port.

A trade designation for a packaged auxiliary generating set, a self-contained diesel generator unit supplied as a complete package for shipboard electrical power.

Specialists who calculate and apportion losses and contributions in cases of general average, where a sacrifice or expenditure made for the common safety of ship and cargo is shared among the interests involved.

Said of an anchor at the moment it is broken out of the seabed and is just clear of the bottom, hanging on the cable.

Canvas or fabric covers spread over decks to provide shade and shelter from sun and rain.

A trademarked propulsion unit in which an electric motor driving the propeller is housed in a pod beneath the hull that can rotate through 360 degrees, providing both propulsion and steering and giving excellent manoeuvrability.