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Makes good original track line |
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Good in reduced visibility |
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Simple |
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Takes the ship farther away from the scene of the incident |
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Slow procedure |
Figure: Williamson turn
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Rudder hard over (in an ``immediate action'' situation, only to the side of the casualty). |
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After deviation from the original course by 60°, rudder hard over to the opposite side. |
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When heading 20° short of opposite course, rudder to midship position and ship to be turned to opposite course. |
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Fastest recovery method. |
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Good for ships with tight turning characteristics. |
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Used most by ships with considerable power. |
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Very difficult for a single-screw vessel. |
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Difficult because approach to person is not straight. |
Figure: One turn
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Rudder hard over (in an ``immediate action'' situation, only to the side of the casualty). |
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After deviation from the original course by 250°, rudder to midship position and stopping maneuver to be initiated. |
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Will take vessel back into her wake |
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Less distance is covered, saving time |
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Cannot be carried out effectively unless the time elapsed between occurrence
of the incident and the commencement of the manoeuvre is known |
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Cannot be used in an immediate action situation. |
Figure: Scharnov turn
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Rudder hard over to any side. |
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After deviation from the original course by 240°, rudder hard over to the opposite side. |
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When heading 20° short of opposite course, rudder to midship position so that ship will turn to opposite course. |
Source: IMO IAMSAR Manual Vol-III.
Last updated: 20-Oct-2007