Marine Surveyors Lexicon

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Vessel Movement


As caused by the action of the waves as the vessel moves through the water.

A vessel at sea may move in six different directions at the same time:
  1. Heave - Rise or fall of the entire vessel.

  2. Surge - Forward or aft movement of the entire vessel.

  3. Sway - Sideways movement of the entire vessel.

  4. Pitch - Rise and fall motion (bow and stern) on the width center axis.

  5. Roll - Side to side (port and starboard) rocking motion on the length center axis.

  6. Yaw - Port and starboard twisting motion on the vertical center axis.