走錨のお勉強のpdf見つけた＞＜
Loss Prevention and Ship Inspection Department 走錨防止
https://www.piclub.or.jp/wp-content/uploads/2018/04/%E3%83%AD%E3%82%B9%E3%83%97%E3%83%AA%E3%83%99%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%B3%E3%82%AC%E3%82%A4%E3%83%89-Vol.25-Full.pdf