What priority must a power-driven vessel give to a sailing vessel under Rule 10?

A power-driven vessel must give priority to a sailing vessel when both are underway, as stipulated in Rule 10 of the COLREGs. This rule emphasizes the obligation for power-driven vessels to avoid impeding the safe passage of sailing vessels, which often rely on the wind for propulsion and may have less maneuverability compared to powered vessels.

When both types of vessels are navigating in an open or narrow channel, the necessity for a power-driven vessel to provide priority occurs because sailing vessels typically are at a disadvantage with their limited ability to maneuver. This principle is grounded in maritime safety and the prevention of collisions, ensuring that the inherent capabilities and limitations of each craft are acknowledged when meeting on the water.

Other considerations, such as vessel size, nighttime navigation, or equal sharing of channels, do not alter this priority under Rule 10. Thus, the correct understanding of this rule is critical for safe navigation and compliance with maritime law.