Hallberg-Rassy 34.2, Training Manual

Page: 21 / 41

Mar 20 4 - 5
5. MOB Manoeuvres Under Power . Practice has shown that different MOB
manoeuvres may be required, depending upon the situation prevailing and the type of vessel
involved. The effectiveness of the manoeuvres described below has been proved in
numerous MOB scenarios;
the aim is an accurate course reversal that places the vessel on
the previous water track, on the reciprocal heading:
•
Immediate Action Situation: MOB noticed by crew and action is initiated
immediately.
•
Delayed Action Situation: MOB is reported but action is initiated with some
delay.
•
Person Missing Situation: Person is reported missing (time uncertain).
•
When a ship is making full speed ahead, the following three standard
manoeuvres are used;
1. Single Turn (210
º
Manoeuvre)
Rudder hard over (in an immediate action
-situation, only to the side of the casualty).
After deviation from the original course by
250
º
rudder to mid-ship position and
stopping manoeuvre initiated.
2. Williamson Turn (180
º
)
Rudder hard over (in an immediate action
situation, only to the side of the casualty).
After deviation from the original course by
60
º
rudder hard over to the opposite side.
When heading is 20
º
short of opposite
course, rudder to mid-ship position and
vessel turned to reciprocal course.
3. Schanow Turn (180
º
) ( not to be
used in an immediate action situation )
Rudder hard over. After deviation from
the original course by 240
º
, rudder hard
over to the opposite side. When heading
is 20
º
short of opposite course, rudder to
midship so the vessel will turn to the
reciprocal course.