Among the listed vessels, which must keep out of the way of all others?

The correct answer is that a sailing vessel must keep out of the way of all others, particularly when it is under sail only. In navigational rules, sailing vessels have specific obligations under certain conditions that dictate they give way to power-driven vessels, fishing vessels, and vessels engaged in towing.

Sailing vessels operating under sail alone are considered to be at a disadvantage in terms of maneuverability, especially to vessels under power. Consequently, they are often required to yield to any vessel that is constrained by its draft, is engaged in fishing (with gear that restricts its ability to maneuver), or is otherwise constrained in its ability to navigate safely.

Understanding this context is crucial because it defines the maneuvering responsibilities between different types of vessels. For example, while a power-driven vessel might have to yield in specific circumstances, the inherent nature of a sailing vessel puts it in a position where it must be vigilant and give way to other vessels to avoid collisions, especially in congested or narrow waterways.

This guideline is foundational in maritime navigation rules and is important for ensuring safe operations on the water.