The motion of a ship through water requires energy to overcome resistance, i.e. the force working against movement.

A ship at sea moves in six degrees of motion: heave, sway, surge, roll, pitch and yaw. The first three are linear motions.

Hydrodynamic test centres equipped with model testing tanks and propulsor testing facilities to perform experiments on hull and propulsor design.

Passenger ships of 100 gt and above and cargo ships of 300 gt and above are to have an identification number (IMO number) which is to be shown on the statutory certificates.

A ship lifting system. The ship elevator includes a number of hydraulic lift/lower chain jack stations on each side of the elevator platform.

When a vessel rests on something solid other than the blocks in a dry-dock or slipway she is said to be aground.

That portion of a ship hull aft amidships.

The part of the ship form where the parallel middle body and the run meet.

The aft perpendicular passes through the aft end of the freeboard length L.

The compartment in the narrow part of the stern aft of the aft peak bulkhead.

A term applied to the first main transverse watertight bulkhead forward of the stern.

A compartment located aft of the aftermost watertight bulkhead.

The development of a new ship design is carried out in three steps.

A tanker with deadweight of 79,999dwt, however the term Aframax is generally used for tankers in the 50,000 – 100,000dwt capacity range.

In a floating condition; the opposite of aground.

The distance that the ship has advanced in a direction parallel to the original course measured from the point where the helm was put over. See also Manoeuvring parameters.

A solid substance used to remove components from a gas being processed.

Floating, not controlled, without a clearly determinable direction. A vessel is said to be adrift when she breaks away from her moorings.

A coefficient used in the preliminary estimations of the power required in a new design to attain the desired speed.

A sea-going or coastal vessel which is not propelled by oars.