Question 1734 Deck Safety

The correct answer is D) heave. Heave refers to the vertical motion of a floating vessel, which is the up-and-down movement of the vessel as it rides the waves. This is one of the six degrees of freedom for a vessel, the others being surge (fore-and-aft motion), sway (side-to-side motion), roll (rotation about the longitudinal axis), pitch (rotation about the transverse axis), and yaw (rotation about the vertical axis). The other answer choices are incorrect because sway refers to side-to-side motion, surge refers to fore-and-aft motion, and yaw refers to rotation about the vertical axis, none of which describe the vertical motion of a vessel.