What is considered headway speed for a boat?

Headway speed for a boat refers to the minimum speed at which the vessel must travel in order to be considered moving forward through the water rather than merely drifting. This concept is important in navigation, as it helps ensure that the boat maintains control and a water flow over the rudder and propeller for effective steering and maneuverability.

The correct answer of 6 mph aligns with commonly accepted guidelines in many boating contexts, particularly for smaller recreational vessels. When a boat is moving at headway speed, it enables enough water movement to operate effectively, enhancing safety and control.

While other speed options may seem plausible, they generally represent speeds that are greater than what is typically classified as headway speed, which might refer to circumstances where further propulsion and control are possible. Thus, the emphasis on 6 mph as a benchmark reflects both practical experience and established norms among mariners regarding the minimum effective speed for navigation.