What type of vessel should avoid impeding a seaplane on the water?

The correct choice indicates that any vessel should avoid impeding a seaplane on the water. This principle is based on the understanding that seaplanes, like other vessels, require a clear area for safe takeoff and landing. By avoiding interference with their operations, all vessels can help ensure that seaplane pilots have the necessary space to maneuver safely and effectively.

Avoiding impeding a seaplane is crucial not only for navigational safety but also for the successful and efficient operations of air traffic over water. Every type of vessel—whether powered, sailing, or a non-motorized craft—has a responsibility to navigate in a way that does not obstruct the normal functioning of seaplanes. This comprehensive requirement reinforces the overarching goal of the COLREGs regulations to prevent collisions and enhance safety for all maritime activities.