Which axes define the six degrees of freedom?

Which axes define the six degrees of freedom?

• A. The forward, aft, and vertical axes
• B. The horizontal, vertical, and depth axes
• C. Longitudinal X, Lateral Y, and Vertical Z
• D. The diagonal axes across the hull

Answer: (C)

Six degrees of freedom describe movement in three dimensions: the vessel can translate along three perpendicular axes and rotate about those same axes. The standard body-fixed axes for a vessel are longitudinal (X) from bow to stern, lateral (Y) from port to starboard, and vertical (Z) up and down. Movements along these axes correspond to surge (forward/back), sway (side to side), and heave (up/down), while rotations about them correspond to roll (about X), pitch (about Y), and yaw (about Z). This alignment makes the axis set Longitudinal X, Lateral Y, and Vertical Z the correct choice. The other options either mix directions that aren’t three perpendicular axes or use ambiguous terms like diagonal or depth, which don’t correspond to the standard three body-fixed axes.

Six degrees of freedom describe movement in three dimensions: the vessel can translate along three perpendicular axes and rotate about those same axes. The standard body-fixed axes for a vessel are longitudinal (X) from bow to stern, lateral (Y) from port to starboard, and vertical (Z) up and down. Movements along these axes correspond to surge (forward/back), sway (side to side), and heave (up/down), while rotations about them correspond to roll (about X), pitch (about Y), and yaw (about Z). This alignment makes the axis set Longitudinal X, Lateral Y, and Vertical Z the correct choice. The other options either mix directions that aren’t three perpendicular axes or use ambiguous terms like diagonal or depth, which don’t correspond to the standard three body-fixed axes.