The motion of a vessel impacts its stability. Which of these motions shown in the illustration affects the governing "transverse" stability? Illustration SF-0048

Correct Answer: Option D — Roll

Roll is the angular motion about the longitudinal axis, which directly influences transverse stability. It is governed by the relationship between the center of gravity (G) and the metacenter (M). Maintaining a positive metacentric height (GM) is critical to ensuring the vessel's ability to return to an upright position.