An apparatus for stabilizing a vessel is provided. The apparatus, or
"hydrogyroscope," includes a liquid container disposed along the hull of
a floating vessel. The liquid container provides a rotational flow path
therein for a spinning liquid mass. The liquid container also preferably
includes a valve for receiving water or other liquid into the rotational
flow path of the container. The liquid is preferably supplied from the
marine environment in which the vessel operates. In one embodiment, a
motor is provided for rotating the liquid container, causing the water to
rotate along the rotational flow path within the container and relative
to the hull of the vessel. A method is also provided for stabilizing the
vessel. The method in one embodiment includes the steps of moving the
vessel to a desired location within a marine body, filling the liquid
container of the vessel stabilizing apparatus, and actuating a motor that
causes liquid to flow along the rotational flow path of the liquid
container.