Which lines are specifically designed to control the distance of the ship from the pier?

Breast lines are specifically designed to control the distance of the ship from the pier. These lines are typically run from the ship to the dock or pier at an angle, allowing the crew to effectively manage how far the vessel rests against the pier. By adjusting the breast lines, the crew can either bring the ship closer to the dock or pull it further away, which is crucial for safe mooring and undocking operations.

Mooring lines, while important for securing a ship to a pier, serve a broader purpose, anchoring the vessel in place rather than specifically managing its proximity to the dock. Aft and forward spring lines are also essential but are primarily used to control the ship's movement along its longitudinal axis—preventing it from shifting forward or backward rather than adjusting its distance from the pier itself.