Stern tying is the act of securing your boat to the shore after anchoring. Doing this cuts down your boat’s anchorage swing by a dramatic amount; it is not only safer, but also courteous to other boaters by allowing for more boats to anchor in the harbor. The concept is simple, but the execution can be a bit more daunting.
For stern tying, have a crew of at least two and use brightly colored polypropylene floating line of at least several hundred feet and a spool; this provides visibility, durability, and a safe maximum length for tying. Ranger Tugs recommends acquiring one from Fisheries Supply here.
Be noted that your boat will still swing, albeit much less with the stern tie. Take into account other boaters, the depth, and other hazards around you. If you need to cut down on swing even further, you can add another stern tie. However, one should be satisfactory in most cases.