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