In what scenario does a boat reach 'planing mode'?

A boat reaches 'planing mode' when it glides on top of the water at sufficient speed. This occurs when the boat's hull lifts out of the water, reducing hull resistance and allowing for a faster and more efficient travel across the water's surface. In this mode, the boat is typically up on its plane, which means it is riding on the surface rather than pushing through the water, which can lead to better fuel efficiency and speed.

For a boat to achieve planing mode, it generally needs to reach a certain speed determined by its design and weight. In this state, the bow rises, and the boat slices through the water, providing a smoother ride with less drag than when it is in displacement mode, where the hull is submerged and plowing through the water.

The other scenarios do not apply to planing mode: a stationary boat has no speed to create lift; a boat cruising at a slow speed is likely still in displacement mode; and an overloaded boat may struggle to reach planing mode due to excessive weight, hence failing to lift sufficiently out of the water.