Capsize

An overturning of a boat so that the hull or keel becomes exposed.

This can happen when a small craft is overpowered by wind, hit by a wave, loaded unevenly, or handled in a way that reduces stability. Dinghies are designed to be recovered after this happens, but larger vessels may be in serious difficulty if they lose positive stability. Prevention relies on suitable sail area, balanced crew weight, sensible handling and close attention to wind and sea state. Anyone on board should know the recovery procedure for the type of vessel being used.