Which statement is true concerning narrow channels?

Anchoring in a narrow channel is not recommended because it can obstruct navigational traffic and create hazards for other vessels navigating through that area. In narrow channels, vessels are required to maintain safe and efficient passage, and anchoring can impede this, leading to potential collisions or other accidents. The rules of the road prioritize safe navigation and the free passage of vessels, especially in restricted spaces such as narrow channels.

The other options present misunderstandings of navigational rules in these areas. For instance, vessels are expected to navigate carefully and are often required to follow specific protocols in narrow channels, rather than anchoring.