Measurements should be taken with the ship in the loaded or ballast condition.
The course of the ship shall be as straight as possible.
Noise measurements shall be taken at normal service speed and, no less than 80% of the maximum continuous rating (MCR).
Controllable pitch and Voith-Schneider propellers, shall be in the normal seagoing position.
For special ship types and for ships with special propulsion and power configurations, such as diesel-electric systems, the Administration may, in cooperation with the shipyard and shipowners, give due consideration to actual ship design or operating parameters when applying the requirements.
For thrusters, measurements shall be made at 40% thruster power and the ship's speed shall be appropriate for thruster operation.
The Administration, classification societies, shipyard and DP designers, as appropriate, shall agree on a process to simulate the operation of the DP thruster system under conditions which would approximate station-holding at or above 40 per cent of maximum thruster power for design environmental conditions that the ship operates in.