Which rule specifies the conditions of vessels in sight of each other?

The rule that specifies the conditions of vessels in sight of each other is indeed Rule 11. This rule is part of the International Regulations for Preventing Collisions at Sea (COLREGs) and deals with the conduct of vessels when they are observing one another. It states that when two sailing vessels are in sight of one another, they are required to take measures to avoid collisions, which involves understanding the navigation responsibilities that apply to each vessel.

In practical terms, Rule 11 emphasizes the significance of visual presence and how vessels must interpret their surroundings to navigate safely. It is crucial for boat operators to recognize whether they can see another vessel, as this visual sighting affects how they should behave in terms of giving way and maintaining safe distances. This rule helps ensure that all parties maintain awareness and take appropriate action to avoid any potential collisions.

Other rules in the COLREGs cover different aspects of navigation, such as the conduct of vessels in restricted visibility or other specific scenarios, but Rule 11 specifically pertains to vessels that can see each other, thus establishing guidelines for their interaction.