As Chief Engineer or First Assistant Engineer you should be familiar with the six motions of a vessel. Which of these motions affects the governing "longitudinal" stability?

Correct Answer: Option C — Pitch

Longitudinal stability is primarily concerned with the pitching motion, which involves the rotational movement of a vessel around its transverse axis. Pitching affects the trim and longitudinal weight distribution, making it the primary motion tied directly to longitudinal stability calculations under standard naval architecture principles.