Which part of the mooring line should be secured to the dock first?

The working end of the mooring line is the portion that is actively used to secure the vessel to the dock. Securing the working end first allows for better control and handling of the line, making it easier to tie off and adjust as necessary. This ensures that the vessel is properly secured to the dock without the risk of slipping or loosening.

When the working end is secured, it allows crew members to manage the line effectively, facilitating any necessary adjustments to the tension and position of the vessel. This practice is vital for maintaining safety and stability when mooring, especially in varying environmental conditions such as changes in wind and tide.

In contrast, securing the bitter end, middle part, or a loop first would not provide the same level of control and could complicate the mooring process. Therefore, beginning with the working end is the most effective and safest approach to mooring a vessel.