What are aft spring lines used for on a boat?

Aft spring lines are vital for controlling a boat's movement during docking and mooring. These lines are specifically designed to run backward from the boat to the dock, allowing the boat to pivot while staying secured to the dock. When a boat is approaching a dock, the aft spring line helps to prevent the boat from swinging away from the dock and provides the necessary leverage to hold the stern close to the dock. This is particularly useful in tight spaces or when dealing with currents and wind.

Using aft spring lines effectively can enhance the ease of docking, as they help to manage the boat's position and can reduce the risk of collision with the dock or other vessels. Understanding the purpose of aft spring lines is crucial for safe and efficient boating practices.