13.3.1 Deck Camber:

The rise of the deck of the ship in going from the side to the center. The purpose of the camber is to facilitate better draining of water to the sides, which helps to reduce corrosion on deck and keep the deck dry.

13.3.2 Rise of Floor:

The amount by which the line of the outer bottom plating amidships rises above the baseline. The baseline is a reference line, along the upper surface of the keel plate, running fore and aft along the centerline of a vessel.

13.3.3 Tumblehome:

 If the sides of the ship at amidships are not vertical and if the upper deck beam is less than the waterline, it is said to have tumblehome.

13.3.4 Flare:

An outward curvature of the side shell at the forward end above the waterline.

13.3.5 Sheer:

 It is measured as the rise of the deck towards the stem or stern. It is the height of the deck at the side above the deck at the sides amidships.

13.3.6 Bow rake:

The angle of the bow to a vertical line.

13.3.7 Parallel Middle Body:

The Parallel Middle Body is the section of the hull where the midship cross-section remains the same over a number of stations. The Parallel Middle Body is not seen on all ship types and is most apparent on tankers, container ships, and bulk cargo carriers.

13.3.8 Entrance:

The immersed body of the vessel forward of the parallel middle body.

13.3.9 Run:

The immersed body of the vessel aft of the parallel middle body.

13.3.10 Forward Perpendicular:

An imaginary line drawn perpendicular to the waterline at the point where the forward edge of the stem intersects the summer load line. The summer load line is the primary load line, and it is from this mark that all other marks are derived. The position of the summer load line is calculated from the Load Line Rules and depends on many factors such as the length of the ship, type of ship, etc.

13.3.11 After Perpendicular:

A vertical line passing through a point where the after edge of the rudder post (the part of the stern frame of a vessel to which a rudder is fitted) cuts the waterline when the draught corresponds to the summer waterline.

13.3.12 Length between Perpendiculars (LBP):

The distance between the forward and after perpendiculars measured along the summer load line.

13.3.13 Length on the water line:

Ship Length at Waterline (L.W.L.) - The ship's length measured at the waterline.

13.3.14 Length Overall (LOA):

The distance between the extreme points of the ship forward and aft.

13.3.15 Baseline: A reference line, along the upper surface of the keel plate, running fore and aft along the centerline of a vessel.

13.3.16 Depth - Moulded:

The depth of the ship from the upper deck (inside edge) to the baseline, measured at the amidships section.

13.3.17 Beam - Moulded:

The greatest beam or breadth of the ship, measured to the inside edges of the shell plating.

13.3.18 Draught - Moulded:

The distance from the summer load line to the baseline, measured at the amidships section.

13.3.19 Depth - Extreme:

Depth of the ship from the upper deck to the underside of the keel.

13.3.20 Beam - Extreme:

Maximum beam or breadth over the extreme points port and starboard of the ship.

13.3.21 Draught - Extreme:

This is obtained by adding to the draught moulded the distance between the moulded baseline and a line touching the lowest point of the underside of the keel. This line is continued to the Fore Peak and Aft Peak, where it is used as the datum for the sets of draught marks. Distance from the waterline to the underside of the keel.

13.3.22 Afterbody:

That portion of a ship’s hull abaft midships.

13.3.23 Hull:

The structural body of a ship including shell plating, framing, decks and bulkheads.

13.3.24 Forebody:

That portion of a ship’s hull forward midships.

13.3.25 Bow:

The forward end of the ship.

13.3.26 Stern:

The after end of the ship.

13.3.27 Port:

The left side of the ship when looking forward.

13.3.28 Starboard:

The right side of the ship when looking forward.

13.3.29 Lightship:

Lightship or lightweight measures the actual weight of the ship with no fuel, passengers, cargo, water, and the like on board. In other words, the lightweight tonnage of a ship is the sum of all fixed weights, i.e. hull, machinery, outfit and permanent equipment.

13.3.30 Deadweight:

The difference between the displacement and the lightweight is the deadweight tonnage, which is the sum of the weight of cargo, fuel, lubricating oil, fresh water, stores, passengers and baggage, crew and their effects.

13.3.31 Tonnage Measurement:

Tonnage is a measure of the cargo-carrying capacity of a ship. 

Gross tonnage is a unitless index related to a ship's overall internal volume.

Net tonnage is a dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula.