- 著者
- 西村 知久
- 出版者
- 公益社団法人 日本航海学会
- 雑誌
- 日本航海学会論文集 (ISSN:03887405)
- 巻号頁・発行日
- vol.131, pp.33-39, 2014 (Released:2014-12-20)
- 参考文献数
- 7
- 被引用文献数
- 1
The accident between Atago and Seitokumaru has been reproduced using a ship handling simulator and 13 captains of patrol crafts of Japan Coast Guard have observed the target vessel Atago from the view point of Seitokumaru and they have answered a questionnaire on the target vessel in length, the crossing angle between Atago's course and Seitokumaru's course and on a method of a collision avoidance with Atago. Where, the overall length of Atago is 165 meters and the horizontal distance between her two masthead lights is about 10 meters. In order to investigate effects of the arrangement of the masthead lights, the target vessel is replaced by an ordinary cargo vessel which is almost same size of Atago and the same simulation has been conducted. In case of Atago, 10 captains have estimated her length to be at least 50m shorter than the real value and 10 captains have estimated the crossing angle to be at least 35 degrees larger than the real value and 8 captains have selected to pass Atago's bow.In case of the cargo vessel, 3 captains have estimated her length to be at least 50m shorter than the real value and 2 captains have estimated the crossing angle to be at least 35 degrees larger than the real value and 11 captains have selected to pass the stern of the cargo vessel.
- 著者
- 西村 知久
- 出版者
- 公益社団法人 日本航海学会
- 雑誌
- 日本航海学会論文集 (ISSN:03887405)
- 巻号頁・発行日
- vol.136, pp.17-24, 2017 (Released:2017-07-01)
- 参考文献数
- 5
In case of a collision between a large vessel and a small craft, a compass bearing of the small craft observed from the bridge of the large vessel can appreciably change when the collision place on the hull of the large vessel is at a distance from her bridge. It means that risk of collision may sometimes exist even when an appreciable bearing change is evident. In order to investigate how the seafarers understand this phenomenon, the author has referred a report of the collision between the Japan Maritime Self-Defense Force vessel Ōsumi and pleasure boat Tobiuo published by the Japan Transport Safety Board and has made a simulator scenario. The scenario gives a moving image of a small craft approaching to the bow of a large vessel with a collision course like Ōsumi and Tobiuo. Thirty three seafarers have watched the small craft from the bridge of the large vessel reproduced by a ship-handling simulator. About half of them have misjudged that the small craft will pass the bow of the large vessel because the compass bearing of the small craft appreciably change to ahead. It is verified that seafarers can sometimes misjudge risk of collision due to appreciable bearing change.