抄録
In the marine traffic environment in the recent years, the radar display of the marine navigation has been improved due to the increasing use of Automatic Identification System (hereafter called AIS). This fact certainly contributes to the improvement of marine traffic safety, however, still there are a large number of vessels operated by the conventional navigation instruments without AIS. The authors think as follows: there is a potential risk triggered by the marine traffic environment with different information volume between the vessels with AIS and those without AIS. Under the premise of this marine traffic environment, this study is focused on the west entrance of Kurushima Kaikyo Strait traffic route where a lot of small vessels sail and a unique navigation rule called “Jun-chu Gyaku-sei” or “Central traffic route at fair current, west traffic route at adverse current” is observed. We analyzed the dangerous head-on position cases that can happen at the traffic route. Toward the goal to develop a method of risk assessment for the vessels of different information volume with or without AIS, we tried to make a simple model regarding the features of the distance sailed and hereby report the result.
