Abstract
The distribution of the ships anchoring in Osaka Bay is investigated from the harbor radar photographs when a typhoon approaches. The distance between the closest two ships is measured and the mean is calculated. It is also investigated that how many ships can anchor in Osaka Bay. If we consider that the anchorage belong to one ship is a circle having a diameter of 1650m which is nearly equal to the mean distance of the two ships, it is said that only about 180 ships can anchor in Osaka Bay, and it is concluded that the anchorage area in Osaka Bay must be insufficient in near future when a typhoon approaches.