Abstract
In order to promote the efficient transport by large vessels in ports of Japan, one of the useful methods is to use tidal window in case it takes a long time to dredge channels. Such waterway navigation has certain risks, so safety measures are necessary. However its actual practices are not well examined.
This paper organizes risks, operational standards etc. regarding the use of tidal window over the world. Furthermore this paper analyzes actual conditions and practices such as tidal use policies or draft management of waterway navigation by AIS.
