1965 Volume 34 Pages 59-64
We made researches on the clearance distance from the dangerous objects by using the working ship for bowling the sea bottom anchored in the vicinity of the recommended route, East of Akashi Kaikyo. The results are as follows: (1) The clearance distance to the dangerous objects around the route will affect the vessels underway is about up to 300 meters. On D/L (D…clearance distance, L…length of a ship) it has become to 2. (2) If the clearance distance from the dangerous objects around the route indicated by D/L is within 0.56 to 2. The average is 1.57, viz., about 1.5 times the length of a ship.