A Study on the Vagueness in sailing rule of COLREGs of Maritime Autonomous Surface Ships

COLREGs are rules to prevent collisions at sea,and are composed based on the Qualitative rule.Despite the rules,maritime accidents continue to occur,and autonomous ships have appeared due to reducing human error of crew and technological development.In this process,the problem of collision avoidance between manned and unmanned ships emerged,and to solve this problem,an automatic collision avoidance algorithm based on COLREGs was developed.However,since COLREGs sailing rule are based on qualitative rules and Good Seamanship,their standards are different,and this standard created a difference between the standards and the crew's collision avoidance situation awareness.Therefore,in this study,the crew's perception of the collision situation based on COLREGs was identification,and the results were analyzed for the sailing rule between manned and manned ships or unmanned and manned ships.The result was analyzed that the navigator showed vagueness about the three collision avoidance models of COLREGs,and that it was different depending on the collision angle.