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In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. [1] In commercial vessels, the latter criterion measured relative to the ship's load line , regardless of deck arrangements, is the mandated and regulated meaning.
Deadweight tonnage is a measure of a vessel's weight carrying capacity, not including the empty weight of the ship. It is distinct from the displacement (weight of water displaced), which includes the ship's own weight, or the volumetric measures of gross tonnage or net tonnage (and the legacy measures gross register tonnage and net register tonnage).
Devices akin to slide rules have been available since the 1950s to aid in these calculations. Presently, it is done with computers. [6] Displacement is usually measured in units of tonnes or long tons. [7]
Freeboard is also reduced for ships that have large openings in the hull and open cargo spaces such as Roll-on/roll-off car carriers. [6] According to the Annexes to the convention, also taken into account are the potential hazards present in different zones and different seasons and additional safety measures concerning doors, hatchways, etc.
LOA (length overall) & LWL (length at the waterline) Detailed hull dimensions A vessel's length at the waterline (abbreviated to L.W.L) [1] is the length of a ship or boat at the level where it sits in the water (the waterline).
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Beam – A measure of the width of the ship. There are two types: Beam, Overall (BOA), commonly referred to simply as Beam – The overall width of the ship measured at the widest point of the nominal waterline.
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