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

What is Scharnov turn?

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.