The Heaving Line Knot, or Franciscan Monks' Knot , is widely used by sailors, is tied at the end of a lighter line which in turn is attached to a heavier line. The lighter line is thrown first, usually from boat to shore, so the heavier line can then be drawn or heaved behind it.
To Tie a Heaving Line Knot:
Form a large loop in the working end of the rope.
Take the working end over and back under the standing part and compress the loop.
Make four turns with the working end around the standing part and the compressed loop.
On the fourth turn take the working end down through the loop. Keep the already formed turns as tight as possible.
Pull on the working end and the standing part to tighten the knot. As the knot is tightening, form the final knot shape.