海上におけるフィールドファクターに関する一考察 : 衝突海難事例の初認距離による推定

抄録

This study considers the field factor at sea with using the first recognition distance (unit : nautical mile) based on the investigation of the case with ship's collision and the visibility level while examining a psychological factor necessary for the lookout. Field factor at sea presumed from the distance of first recognition in case of ships' collisions, and the results are as follows ; (1) In case of small boats' collision Field factor at sea is 2 by using with visibility level=4 to the distance (0.8 nautical miles) of first recognition. (2) In case of large vessels' collision Field factor at sea is 3 by using visibility level=6.5 to the distance (1.5 nautical miles) of first recognition. (3) 1/4 of the distances to the horizon corresponds to the distance of first recognition.