| Summary: | 碩士 === 國立海洋大學 === 航運技術研究所 === 85 === When a ship is exposed to risk of collision, the navigator has to take avoiding actions complying with the international regulations for preventing collisions under the circumstances to prevent a marine casualty. The judgment of the risk completely depends on the navigator''s subjective recognition to navigational safety. In other words, if his collision-avoidance actions can not keep a safe distance to other ships, consequently the accident may still happen. Ship domain which is a basic theory for analysis of ship-handling behavior can display the characteristics of the requirement for ship movements. There are some factors, such as ship-handling and marine environment, affecting the difference of the requirement. Therefore, this study is focused on the actions and behaviors of mariners by questionnaire and ship handling simulator experiment. The former surveys the navigator''s comprehension and desire to collision avoidance with experience and knowledge. The latter analyzes actual expressions within navigable sea rooms with different encounter situations and visibility. The study shows that the safe distance between ships under collision risk is compressed and less than navigator''s desire, and the effect of poor visibility significantly causes navigators to take safe and early actions. The results can provide navigators correct aspects assessing the requirement of safe distance when facing collision risks, and are helpful for auto collision avoidance system as reference to design collision warning signals.
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