From viewpoint of ship safety and cargo management, in previous study we are cleared that it is very important for making a criterion of judgment of ferry cancel based on both observed ship motions when the ship encounters a typhoon and coastal wave data at that time. In this study, we attempted to improve the accuracy of numerical reproductions of ship motions based on observed coastal waves. The model considering the memory effect function is introduced. The verification of the model is carried out by using the data of ship motions were observed with 5,000GT type ferry boat, and the coastal wave data were recorded with NOWOHAS as well as our previous study. A couple of future problems with respect to the simulation model are considered.

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