Why need docking lines?
Docking lines is what keeps your boat in place at the dock, so it needs to be strong, as well as resistant to abrasion, UV rays, and rot. Typical Docking Line Arrangement. The powerboat is using double bow and stern lines to keep the boat away from the dock. The sailboat is using tow lines to prevent fore and aft surging, while the bow and stern lines "locate" the boats.