Nylon is a strong durable synthetic is best suited to docklines. Pre-made anchor lines and docklines are made with four-tuck splices. Premium lines have a five-tuck splice, and the bitter end is whipped. Its high stretch, low cost, and soft texture make nylon the best choice.
How big should the dockline be ?
Boats under 20' generally use 3�8" line; 20-30' boats, 1�2" line; 30-40' boats, 5�8"; and boats over 40', 3�4". If your boat is heavier than average, or has greater windage, you may want to choose the next larger size.
How long should the dockline be ?
As a general rule docklines should equal two-thirds of your boat's overall length. Spring lines should be slightly longer, approximately the same length as your boat.
How many docklines do I need ?
Unless your boat is unusually heavy or will be subjected to severe conditions, a bow line, stern line, and two spring lines are recommended. Spring lines keep the boat snugly near the dock by preventing it from moving fore or aft, while allowing for the rise and fall of the tide. Of course, if your permanent slip has outboard pilings as well, you'll need an additional bow and stern line.
