Which vessels must adhere to the rules in the section that apply to vessels in sight of one another?

The correct answer is that all vessels must adhere to the rules in the section that applies to vessels in sight of one another. This is because the COLREGs are designed for the safety of navigation and to prevent collisions at sea, and they apply universally to all types of vessels, regardless of their size, type, or purpose, when they are in sight of each other.

This rule recognizes the importance of maintaining situational awareness and safe navigation practices among all mariners, ensuring that every vessel, whether it is a commercial ship, a fishing vessel, a recreational boat, or any other type of watercraft, understands and follows the same set of guidelines to avoid accidents. The intent is to create a common framework that facilitates safe interactions between different types of vessels navigating in close proximity to one another.