From viewpoint of a ship safety and a cargo management, the examination of a criterion of judge of ferry cancel is carried out, based on both observed ship motions when the ship encounters a typhoon and coastal wave data at that time. Ship motions are observed by using 5,000GT type ferry boat. And as the wave data, coastal waves that recorded with NOWOHAS instead of the encounter wave which can not be measured, are used. These data are analyzed by Spectral Analysis and the characteristics are analyzed in detail. Moreover, numerical reproductions of ship motions based on observed coastal waves are carried out, and a couple of future problems with respect to the decision of the criterion of judge of ferry cancel are considered.
