What is Centre of Buoyancy of a ship?

Centre of Buoyancy of a ship is defined as being at the geometric centre of the underwater volume of the ship at a particular instant and is the point through which the total buoyancy force (B) is considered to act vertically upwards.


The vertical position of the centre of buoyancy is termed the KB, being the vertical distance from the keel (K) to the centre of buoyancy (B).

58For a box-shaped vessel on even keel KB is half the draught.