No abstract

As fundamental research of the operation of autonomous ships on the monitoring screen on shore, this paper focused on the differences in collision avoidance judgments based on various information sources, specifically via radar and via visual confirmation. Experiments were carried out using a ship-handling simulator with 14 seafarer trainees who had acquired the same level of maritime knowledge but had no actual experience at sea. Two experiments were carried out: a simple situation with one target ship appearing, and a complex situation where several targets appeared. The judgments in the complex situation showed that radar decision timing was quicker than visual decision timing. On the other hand, the simple situation showed no difference in course alteration and timing. Further results indicated that evaluation of the involved ships in the situation and the back ground of judgments varied depending on information sources. It is suggested that evaluation of the involved ships and the back ground of judgments may lead to differences in collision avoidance judgments. 本研究では，画面上に表示された情報による遠隔操船を考えるための基礎的研究として，操船シミュレー タを用い，目視情報のみを使用し衝突回避判断を行う実験と，計器情報(レーダー)のみを使用し衝突回避 判断を行う実験を，出現する隻数の異なる2種類の交通流で実施し，情報源の違いによる衝突回避判断に関 して検討を行った．実験参加者は，知識はあるが実航海での経験がない14名であった．衝突回避判断および 衝突回避判断に関わる事項を調査分析した．その結果，他船が一隻の状況では衝突回避判断に差がないが， 他船が複数隻存在する状況では，計器情報の方が早めに衝突回避を行うことが示された．このことは，衝突 回避判断に関わる事項( 「関心を抱く船」 ， 「衝突回避判断の背景」 )において，情報源間で差異が生じている ためと考えられた． (キーワード：情報源，衝突回避，レーダー，判断，遠隔操船)1 受付：2016年7月18日 受理：2017年10月24日

The purpose of this study was to examine whether the collision avoidance judgement of seafarers is affected by each information sources, radar and visual. 22 seafarers who had onboard experience participated in the experiments using ship-handling simulator. Subjects were divided two groups, one group was conducted experiment for visual source, and another group was for radar source. This study investigated influence of each information source basis on results of their judgement, reasons why they made the decision, vessels which they paid attention to during experiments, and evaluations of their decision making by themselves. As a result, the judgements in both sources showed no differences. It was suggested that ships which the subjects paid attention to the decision making was different between each information source, even if the results of their decision were the same.