Relations between Ship-handling Information and Human Behavior in Collision Avoidance

Abstract

Using the ship-handling simulator, mariners' communication among a bridge team and their behaviors when they handle a ship in good and poor visibility has been analyzed. Under the good visibility, they can recognize not only the existence of a target vessel but also her course and change of her course by the aspect. On the contrary, they can not recognize the course and the change until they acquire the target vessel by using RADAR/ARPA under the poor visibility. Moreover it has been verified that even if the vector of the target vessel is indicated on the RADAR/ARPA display, they do not recognize the change of her movement when they do not keep observation on her. That delays their recognition of the danger of the collision and shortens the time to avoid the collision. Under the poor visibility, they must get more information on the target vessel and analyze it to avoid the collision in the short time rather than present condition. That is the reason why ship-handling under the poor visibility is dangerous.