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

关于江户时代航海技术的资料，在各个地方都留下了类似海道的图形，但很少有关于海上道路的研究作为将它们混为一谈的路线。在资料馆、博物馆等地方张贴的海道图中，以单纯链接的方式展示当年重要港口的海道图最多。分析了本研究中的海道图之一“Kokoku kaiganzu”所提到的港口信息，明确了当时世通内海的航行信息，并尝试将当时的航道与主要港口的距离与现在的海图进行比较。此外，它还破译了江户时代航海文献之一的《仙舟记》，它将主要港口，岛屿，礁石等绘制成图表并进行了分析。此外，还收集了江户时代的各种航道图和平面图，并在对比中考察了当时使用航道图的目的和精度。

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.