A power-driven vessel proceeding downstream in a narrow channel on the Western Rivers sights another power-driven vessel moving upstream. Which vessel has the right of way?

Answer: A — The vessel moving downstream with a following current

In the scenario described, the power-driven vessel proceeding downstream has the right of way due to the nature of navigation on narrow channels, especially in Western Rivers. According to the Navigation Rules, vessels moving downstream are typically given precedence over those moving upstream when navigating in narrow channels or straits. This rule is based on the expectation that the downstream vessel is more easily able to maintain its course and speed due to the assistance of the current. When two vessels meet in a narrow channel, the vessel that is downstream has the advantage of the current which can help it maneuver more effectively compared to a vessel coming upstream, which is working against the current. Thus, it is the responsibility of the upstream vessel to take precautions and yield to the vessel moving downstream, ensuring safer navigation and reducing the potential for collisions. In addition, the concept of maintaining safe passage in narrow waterways reflects the need for a predictable flow of traffic, which enhances safety for both vessels involved. The downstream vessel's right of way is an important guideline for all mariners to understand in order to navigate these environments safely.