My floating dock has a free standing pole on the outside. I ran a line to the floating dock with a sliding ring and a "spring" line. In combination with the port bow line, which is not "floating", it holds the boat off the dock so it doesn't rub on the fenders. After a storm it also prevents the "brown foam" from piling up between the boat and the dock, staining the hull. I use the center dock line to pull the boat tight to the dock for loading. Normally the lines have slack and the boat freely floats away from the dock
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