What is the 'stern line' used for in docking?

The term 'stern line' refers to a specific type of line or rope used to secure a boat to a dock at the stern, or rear, of the vessel. When docking, the stern line is crucial for ensuring that the boat remains in a fixed position and does not drift away from the dock. This line helps to stabilize the boat against wind and current, providing safety for both the vessel and those on board.

In addition to its primary function of securing the boat, using a stern line also aids in properly aligning the vessel alongside the dock, making it easier for passengers to board and disembark. It is an essential component of boat handling, particularly in busy marinas or during turbulent conditions.

The other options do not accurately reflect the purpose of a stern line in docking procedures, as they pertain to different aspects of boating and safety measures.