(c) The following changes to a vessel's lightweight characteristics are considered to adversely affect vessel stability:

1. (1) An increase in the vertical center of gravity at lightweight by more than 2 inches (51 millimeters) compared to the original lightweight value.
2. (2) An increase or decrease of lightweight displacement by more than 3 percent of the original lightweight displacement.
3. (3) A shift of the longitudinal center of gravity of more than 1 percent of the vessel's length.

(d) In determining whether or not a vessel's stability has been adversely affected, a qualified individual must, at a minimum, consider the net effects on stability of any:

1. (1) Reduction of the downflooding angle;
2. (2) Increase in the maximum heeling moment caused by fishing gear or weight lifted over the side due to changes in lifting arrangement or capacity;
3. (3) Reduction in freeing port area;
4. (4) Increase in free surface effects, including increased free surface effects due to water on deck associated with any increase in length or height of bulwarks;
5. (5) Increase in projected wind area;
6. (6) Decrease in the angle of maximum righting arm;
7. (7) Decrease in the area under the righting arm curve; and
8. (8) Increase in the surface area on which ice can reasonably be expected to accumulate.