抄録
The accident involving the ferry, Ariake, which heavily listed in Kumanonada in 2009 was shocking. This accident was reported by every research organization. The Ministry of Land, Infrastructure, and Transport announced measures to prevent such accidents from reoccurring. These measures mentioned the handling of the ship in a following sea, and the lashing of the cargo. However, it is difficult to satisfy these measures when a ship coasts. Moreover, engine performance also creates limitations. In this context, stability is regarded as a primary factor in preventing a similar accident. At first, the authors produced an experimental monitoring system of the rolling period. Then, it was put on a Ro-Pax ferry and operated in various situations encountered in voyages.
As a result, changes to stability were able to be visualized from moment to moment. The mates came to understand the influence that veering, and the slowdown of one's ship, had on stability. When such a system proved to be useful, it was taken into consideration.
