Watch out for this popular knot - the square knot for boating. It is including here as much as to warn you of its pitfalls as to show the proper way to tie it! The square knot is an easy to tie knot that is good for securing non-critical items. It should not be trusted to join two ropes together or to hold down something that absolutely has to stay put. This knot will capsize or jam under load and will also untie itself under movement. This knot tying instructional animation will help you hone your square knot boating skills. Enjoy.