Dynamic Positioning - Scope

Scope

A ship can be considered to have six degrees of freedom in its motion, i.e., it can move in any of six axes.

Three of these involve translation:

  • surge (forward/astern)
  • sway (starboard/port)
  • heave (up/down)

and the other three rotation:

  • pitch (rotation about surge axis)
  • roll (rotation about sway axis)
  • yaw (rotation about heave axis)

Dynamic positioning is concerned primarily with control of the ship in the horizontal plane, i.e., the three axis surge, sway and yaw.

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