Which action is not required when two sailing vessels encounter each other under the Navigation Rules?

When two sailing vessels are approaching one another, the Navigation Rules specify certain actions to take to prevent collisions. The correct action indicated in the choice is to maintain the same course and speed if on a collision course. In fact, this is not a required action when two sailing vessels encounter each other.

The rules dictate that when two sailing vessels are on a collision course, the vessel that has the wind on its port side must give way to the vessel that has the wind on its starboard side. Additionally, if both vessels are heading towards one another, they are to both alter course to starboard as a means of passing each other safely. Sound signals can also be used to indicate intentions when vessels are in close quarters.

Therefore, choosing to maintain the same course and speed is not a safe or required action in these situations, as it could lead to a collision when maneuverability is necessary for both vessels to avoid an accident. This highlights the importance of understanding the obligations under the Navigation Rules to ensure safety at sea.