First, think of three axis through the ship. All motion happens along or around these axis. Think of each axis as a pole, and motion either rides up and down the pole or slides around it.

 

FYE: when a ship is said to move bodily, the whole ship maintains current list, trim, and heading, but moves in a steady direction without rotating at all.

 

The first axis is the vertical.

-Heaving: when a ship moves vertically up and down bodily

-Yawing: when a ship rotates about the vertical axis (when the vessel turns)

 

The second axis is the longitudinal, running from the bow to the stern:

-Surging: when a ship moves bodily along the longitudinal axis fore or aft

-Rolling: when a ship rotates about the longitudinal axis (the ship lists to one side or the other)

 

The last axis is the transverse, running from the port side to starboard:

-Sway: when a ship moves bodily along the transverse axis from side to side

-Pitch: when the ship rotates about the transverse axis, (the bow or stern rises while the other end does the opposite)