Which line is used to keep the stern of the vessel in position?

• A. Stern line
• B. Aft bow spring line
• C. Fwd quarter spring line
• D. Aft quarter spring line

Answer: (A)

The correct answer identifies the stern line as the attachment that specifically serves the purpose of keeping the stern of the vessel in position. When a vessel is being moored or docked, the stern line is secured to a fixed point, such as a dock or pier, and works to prevent the stern from swinging away, thus maintaining the vessel's orientation and stability.

The other options serve different functions. The aft bow spring line is typically used to prevent the bow from moving forward or swinging away from the dock. The forward quarter spring line is set up to hold the vessel in place but primarily works on the forward quarter, affecting how the vessel is balanced between the bow and stern. Finally, the aft quarter spring line helps to manage the movement of the vessel's stern but does so in conjunction with other lines, making it less direct in its effect compared to the stern line itself.