Abstract
The marine transportation has recently intensified owing to our country's economic development. The fair-way traffic volume in the Kanmon strait is about 1000 vessels a day and traffic congestion has brought about a great number of sea accidents. It is the problem of marine traffic in the harbour and narrow channel to develop securer and more efficient system of traffic control, and it is necessary for marine traffic improvement to find the actual state of traffic. From this point of view, the reserch on ship's speed under passing was conducted with radar and visual observations from Aug.30 to Sept.3 in 1967 at Oseto in the Kanmon strait. This report described the characteristics of the ship's speed under passing through the Kanmon strait.
