Abstract
Development of cognitive task model is necessary for safety evaluation of man-machine system. Authors have built a model of ship navigator for evaluating performance, but maneuverability which is an important characteristic of ship is not considered in the model. In this paper, for improving and refining the model, real ship navigation data was recorded and analyzed. In this analysis, watch keeping task of ship navigator in full and ballast condition are compared for understanding effects of ship maneuverability. As a result, the effects on timing and duration of watch keeping by maneuverability are partly clarified. Based on this, the ship navigator cognitive task model is reconsidered and refined.
