Manoverboard Turns

Manoverboard Turns

1. Williamson turn

Advantage and Disadvantage

• makes good original track line
• good in reduced visibility
• simple
• takes the ship farther away from the scene of the incident
• slow procedure

Procedure 

• Rudder hardover (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.

2. Scharnov turn (Not to be used in an “immediate action ” situation)

Advantage and Disadvantage

1. will take vessel back into her wake
2. less distance is covered, saving time
3. cannot be carried out effectively unless the time elapsed between occurrence of the incident and the commencement of the manoeuvre is known

Procedure 

1. Rudder hardover.
2. After deviation from the original course by 240°, rudder hard over to the opposite side.
3. When heading 20° short of opposite course, rudder to midship positions o that ship will turn to opposite course.

3.One turn ("Single turn, Anderson turn")

Advantage and Disadvantage

1. fastest recovery method
2. good for ships with tight turning characteristics
3. used most by ships with considerable power
4. very difficult for a single-screw vessel
5. difficult because approach to person is not straight

Single turn (270° manoeuvre) Procedure

1. Rudder hardover (in an “immediate action ” situation, only to the side of the casualty ).
2. After deviation from the original course by 250°, rudder to midship position and stopping manoeuvre to be initiated.

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