Development of a support system to predict dragging anchor phenomenon for mariner

When the approach of typhoon is forecast, a lot of ships moves into the bay and the ships cast anchor and stay in the bay until the typhoon passes away. If the ship was assumed to be a system, a bay where a lot of ships stayed in was assumed to be a system of systems. Therefore, the safety of the bay was maintained by the each ship. To keep the safety of the ship, mariners had to pay attention to whether dragging anchor phenomenon had happened or not. If the dragging anchor phenomenon started, it was difficult to recover the ship´s state and it caused collision with other ships and grounding accident. Therefore, authors developed a support system to predict the dragging anchor phenomenon for mariners. In this paper, the method of predicting the dragging anchor phenomenon was described and the effectiveness of the system was indicated with experimental results.