The purpose of this study is to analyze the actual situation of waiting ships anchoring offshore, and determine their influence on maritime traffic. This kind of study has never been conducted before, because obtaining the data on waiting ships requires much time and labor, and it is very difficult to obtain such data over a long period by observation. This study utilizes automatic identification system (AIS) data, which make it much easier to conduct studies involving a large number of observations. The situation of waiting ships was determined based on an analysis of the AIS data. This paper also presents the results of an analysis of how the waiting ships affect sailing ships.

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