The investigation study about the sailing technique and the passage on the Setonaikai about Edo Period

江户时代的航海技术资料多为各地的航海图形，但很少将海上航道作为归类的过程进行研究。对于资料馆、博物馆等所陈列的大部分航海图形，仅通过简单的链接来显示当时的重要港口之一。分析了本研究中提到的海航图形之一--Koku Kaiganzu港口的信息，对江户时代的航海资料进行了梳理，并在航道与主港之间的距离上与现在的海图进行了比较；对江户时代航海文献之一的《千户记》进行了破译，在情节中对主港、岛、壁架等进行了图解分析；收集了江户时代的各种航道图和平面图，考察了江户时代海图的使用目的和比较的精确度。

A data about the sailing technique in Edo Period is left as the one like the seaway figure in each place but there is little study of the road on the sea as the course to lump them together.As for most of the seaway figures which are placarded at the data house and in Museum and so on, the one of which an important harbor in those days is shown by linking it simply only is most.It analyzed information at the harbor which is mentioned to " the Kokoku Kaigannzu " which is one of the seaway figures in this study, it made sailing information on the Setonaikai in those days clear and it tried comparison with the present chart in the distance between the passage and the main harbor in those days.Also, it deciphered " the Senchu-Ki " which is one of the literature on the sailing in Edo Period, it made the main harbor and an island and a ledge in it and so on a chart in the plot and it analyzed.Besides, it collected a various passage figure and a plan in Edo Period and it examined the purpose of the seaway figure in those days of the use and the precision of it in the comparison.