In recent years, increased ship size and traffic density have heightened the risk for collision. When a ship is exposed to such a risk, the officer in charge must take evasive actions appropriate with the circumstances to prevent this from happening. Such actions shall comply with the International Regulations for Preventing Collision at Sea. However, violations of the regulations can usually be found in collision cases. This study is focused on the actions of the officers in charge, and whether or not they obey the rules of the regulations, and what are the reasons for navigational faults. The assessment is performed by simulation experiment and questionnaire. The result reveals that the faults are mainly related to carelessness, personal attitude and lack of knowledge.

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