At what point is a boat considered to be in planing mode?

A boat is considered to be in planing mode when the hull rides on top of the water due to sufficient power. In this mode, the boat is able to glide across the surface, which reduces water resistance and allows for higher speeds. This typically occurs when the engine provides enough thrust to lift the hull out of the water, allowing for a more efficient and faster ride.

In contrast, when a boat is at a complete stop, it is not moving forward, so it cannot be in planing mode at that time. Passing slowly through calm waters does not provide the necessary speed or power to achieve planing. Operating in displacement mode means that the boat's hull is displacing water and is fully submerged, which is characteristic of slower speeds and does not utilize the planing capabilities of the hull. Thus, the correct definition of planing mode directly relates to the boat’s ability to ride on top of the water when sufficient power is applied.