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15 INFORMATION TO BE INCLUDED IN MANOEUVRING BOOKLETS

15.1 MANOEUVRING DATA AND/OR DIAGRAMS 

15.1.1 The following information shall be contained in Part 1 of the booklet:

1. The lowest constant engine revolutions per minute at which the ship can safely steer under:
   • 1.1 normal ballast conditions; and
   • 1.2 normal loaded conditions.
2. Change of heading diagram and turning circles to port and starboard giving advance and transfer, time and distance, using maximum rudder angle from an initial full speed and slow speed with constant engine control setting.
   • 2.2 Turning circle information from initial full speed with maximum rudder and engines stopped.
3. Approximate time and distance a vessel will travel with a minimum application of rudder if it retains approximately its initial heading in both loaded and ballast conditions from:
   • 3.1 initial full speed after stopping the engines; and
   • 3.2 initial full speed by the application of astern power at various levels (should the ship turn, the track reach until the ship is almost still in the water - one knot - shall be given).

15.1.2. As much of this information as possible shall be presented in diagrammatic form , such as the following diagram for "Turning Circle" and "Stopping Curves".

TURNING CIRCLE DIAGRAM ^

STOPPING CURVES DIAGRAM

15.1.3 It is recognized that all the necessary information may not be available at the time of the original trials and some of the data may have to be obtained after the ship is in service. However, the basic information shall be completed as soon as practicable. Furthermore, the booklet shall be in such a form that additional data for each manoeuvre could be added and that shipmasters be encouraged to add to this basic information as they gain experience in the handling of the vessel in conditions not covered by the original data.

15.1.4 Copies of the appropriate diagrams shall be posted on the bridge.

15.1.5 All data provided shall be for calm weather, no current and deep-water conditions with clean hull. These facts shall be clearly noted on the data displayed with a warning that the vessel's response may significantly change under different conditions, including shallow water.

15.2 SUPPLEMENTARY INFORMATION ^

15.2.1 The attention of masters is drawn to the following points which shall be considered in relation to the safe handling of the ship:

1. Squat. The decrease in clearance under the keel when a vessel is under way in shallow water is known as squat, and varies with speed. A vessel which will in certain circumstances squat several feet can effectively reduce this by a substantial reduction in speed.
2. The extent of "blind zone" forward created by the forward part of the vessel may be inhibiting and its extent shall be determined in both loaded and ballast conditions.
3. Consideration shall be given to the effective increase in draught due to the ship motion in a seaway.
4. It shall be noted that where practicable the quickest method of reducing headway is to turn under the influence of full rudder, with or without the use of engine astern power.

15.3 INTERNATIONAL STANDARD ^

15.3.1 The International Maritime Organization Resolution "A.209(VII) Recommendation on Information to be included in the Manoeuvring Booklets" is the adopted standard.

15.4 EFFECTIVE DATE ^

15.4.1 This Standard comes into force on 1 September 1985.

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