Abstract
The research and training vessel SHINYO-MARU Ⅳ was constructed in 2016 for the development of
the fishing techniques as well as the training of fishery navigation. For this purpose, the steering quality
was well designed by means of equipping her with twin controllable pitch propellers （CPP）, large size
rudders（ Sheering rudder）, Anti-rolling tank, and bow thruster.
In order to clarity the maneuvering performance full-scale trial was carried out using by GPS
system, where sufficient maneuverability was confirmed. Then, these characteristics were numerically
simulated based on IMO regulations of maneuverings. It was found that the results are in good
agreement with the results of the full scale trial better than SHINYO-MARU Ⅲ .
