Substantially altered means the vessel is physically altered in a manner that affects the vessel's stability and includes:
(1) Alterations that result in a change of the vessel's lightweight vertical center of gravity of more than 2 inches (51 millimeters), a change in the vessel's lightweight displacement of more than 3 percent, or an increase of more than 5 percent in the vessel's projected lateral area, as determined by tests or calculations;
(2) Alterations which change the vessel's underwater shape;
(3) Alterations which change a vessel's angle of downflooding; and
(4) Alterations which change a vessel's buoyant volume.