In ship operations, it is extremely important to monitor the position of the ship for maintaining a safe voyage. Considering the current situation of the dissemination of GPS and ECDIS, it has become common to use these navigational instruments. However, it is still essential for officers on watch to have the skills to fix the position with reference to landmarks such as lighthouses, land structures, island topography.

 In this study, two weak points on position fixing skills for deck cadets were identified through the questionnaire survey. As a result, effective training methods for improving the position fixing skills were developed and the validation for effectiveness of the developed training methods was carried out.

 This dissertation is a study on the interchangeability and the gap between the 1978 STCW Convention and the 1995 STCW-F Convention to seek the bridge between the conventions. Contents of the current STCW-F Convention are poor and outdated compared with them in the STCW Convention and the Code. However, the comprehensive review of the STCW-F Convention has been completed in the HTW Sub-Committee of IMO; and the amendments are expected to be adopted in 2024. After 2024 amendment, the contents of the STCW-F Convention will be bulky, detailed, updated, and practical. Accordingly, number of contracting states are increasing in recent years. The presence of the STCW-F Convention is increasing. The interchangeability and the gaps between the STCW Convention ant the STCW-F Convention after 2024 amendment are examined in this study to bridge the gaps. As a first step this dissertation is focused on the standards of competences for deck officers.

 Knowledge, Understanding and Proficiency (KUPs) were extracted from the tables A-II/1 and A-II/2 of the STCW Code and tables A-II/1 and A-II/2 of the STCW-F Code, and compared.

 From the analyses of the data compared, high similarity between the two convention was found. Moreover, to bridge the gaps between the conventions, supplemental competence tables for seafarers who has CoC issued in accordance with STCW Convention, wish to be certified as a skipper or deck officer of the STCWF Convention, as amended, were provided in the annexes 3 and 4.

 The pass rate for the fourth-class seafarers oral tests(navigation/engineering) continues to be lower than the JMETS target. Therefore, in this study, the author analyzed answer data from the online ability tests(navigation/engineering) with the purpose of increasing the oral pass rate. As a result, it was found that there was a significant difference in the average score and average correct answer rate between students who passed and those who failed. It will be possible to provide students who failed the oral tests with teaching materials that focus on supplementing questions with a low correct answer rate.This result is important because the provision of suitable learning materials leads to higher pass rates.

 The Global Sulphur Cap 2020, which regulates air pollutants emitted from ships, mandates the use of fuel oil with a sulphur content of 0.5% or less. It is expected that particulate matter (PM) emissions from ships will decrease, but it is still unknown how their chemical and toxicological properties will change. In this study, the mutagenicity of sampled soot and emitted PM, and the relationship with major PAHs and NPAHs were investigated with the aim of understanding harmful substances in the exhaust gas emitted into the atmosphere from ship engines fueled by heavy oil.As a result, both samples were found to be mutagenic. In addition, the analysis of NPAH adsorbed on PM indicated that three types of Dinitropyrene may contribute more to mutagenicity than 1-Nitropyrene.