What are the Standard methods of maneuver of man overboard as per IAMSAR ?

Williamson turn:

Makes good original track line.
Good in reduced visibility.
Simple & Slow procedure.
Takes the ship farther away from the scene of the incident.
Rudder hard over (in an immediate action situation only) to the side of the casualty.
After deviating from the original course by 60 deg. The rudder hard over to the opposite side.
When heading 20 deg’s short of the opposite course, rudder to midship position and the ship to be turned to opposite course.

Single turn or Anderson turn:

Fastest recovery method.
Good for ships with tight turning characteristics.
Used most by ships with considerable power.
Very difficult for single screw vessels.
Very difficult because approach to person is not straight.
Rudder hard over (in an immediate action situation only) to the side of the casualty.
After deviation from the course by 250 degs rudder to midship position.
Stopping manoeuvre to be initiated

Scharnov turn:

Will take vessel back to her wake.
Less distance is covered hence saving time.
Cannot be carried out effectively unless the time elapsed between occurence of the incident.
The commencement of the manoeuvre is known.
Not to be used in an immediate action situation.
Rudder hard over.
After deviation from the original course by 240 degs rudder hard over to the oposite side.
When heading 20 degs short of the opposite course, rudder to midship position so that ship will turn to the opposite course.

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