Rope rescue — can be a subset of complex rescue that requires the use of static nylon kernmantle ropes, anchoring and belaying gadgets, friction rappel products, several products to use mechanical gain for hauling systems, along with other specialized devices… … Wikipedia Permit the boat's momentum straighten it out and http://donovanogyog.theideasblog.com/107706/the-basic-principles-of-anchoring-rope