The deliberate throwing overboard of cargo, or of part of the vessel's superstructure, equipment or stores, in the event of an emergency. Cargo or equipment might be jettisoned to lighten a vessel to relieve it from a strand, to stabilize it during a storm, or to get rid of flammables or explosives during a fire. (Washing overboard is the accidental loss of equipment or cargo overboard due to the action of the elements)