The fourth chapter focuses on expounding the issues in the process of avoiding collision at the " crossing situation " , includes in analyzing the check for the validity and the inharmonic actions of avoiding collision between two vessels , so as to make the avoiding action more timely , accurate , integrated , and effective 第四篇主要论述交叉相遇局面避让过程中应注意的几点问题,包括避让行动有效性的查核和避让行动不协调性的分析,以使避碰行动能更及时、准确、完整和有效。
It is divided into three parts . first one defines various kinds of situations , and the relative position between the vessels in these situations . second one describes the rule for preventing collision in various kinds of situations , and utilizes the cartoon to imitate the avoiding action ; third one uses the typical case to imitate and analyze the questions that may appear or occur often in the action for preventing collision 它主要有三个部分内容:一是对各种局面进行定义,并利用动画模拟各种局面中船舶之间的相对位置;二是说明在各种局面情况下船舶的避让行动规则,并通过动画模拟船舶的避让行动;三是运用典型案例来模拟分析船舶避让当中可能或常见的问题。