Which rule outlines the responsibilities between different vessels at sea?

The key concept of the responsibilities between different vessels at sea is outlined in Rule 18 of the International Regulations for Preventing Collisions at Sea (COLREGs). This rule is essential as it specifies the conduct of various types of vessels in relation to one another to avoid collisions. It categorizes vessels into several groups, such as power-driven vessels, sailing vessels, vessels engaged in fishing, and others, delineating which should take action to keep clear of others.

By understanding this rule, mariners can determine what actions to take based on their own vessel type and the type of other vessels they are encountering. This knowledge is critical for maintaining safety at sea, as it governs the right-of-way and the responsibilities that each vessel has towards one another, ensuring that navigational decisions are made in a manner that reduces the risk of collision.

On the other hand, the other rules referenced have specific focuses, such as signaling and navigation in relation to the presence of other vessels, but Rule 18 directly addresses the important responsibilities and hierarchy required for safe navigation between different vessel types.