Freeboard

Freeboard is the vertical distance from the top of the lowest point of the working deck at the side of the vessel to the waterline.

The light ship weight is the actual weight of a vessel when complete and ready forservice but empty.

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Draught

Draught relates to the depth of water required for a vessel to float freely and is measured vertically from the underneath side of the keel to the waterline.

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Displacement

Archimedes principle: Every floating body displaces its own weight of the liquid in which it floats.

For a vessel to float freely in water, the weight of the vessel must be equal to the weight of the volume of water it displaces.
Displacement is the volume of water the vessel displaces.

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