What action is required when a boat is porpoising?

When a boat is porpoising, which is characterized by the bow rising and falling repeatedly out of the water, adjusting the trim is the correct response. Proper trim allows for better control of the boat's attitude in the water, helping to stabilize its ride. If the boat is trimmed correctly, it can reduce the tendency to porpoise by ensuring that the bow does not lift too high, allowing for a smoother and more controlled motion across the water.

Making adjustments to the trim can involve shifting weight inside the boat or changing the trim tabs or engine tilt. This fine-tuning can lead to a more balanced position for the boat, significantly mitigating the effect of porpoising and enhancing overall performance and safety.