I'm sure you'll agree there are a lot of useless websites out there.
When it comes to boating there aren't too many sites I find useful, but I recently came across one that I could spend hours on.
Especially for you sailors, knot-tying is a very essential skill both for simple boating pleasure and safety since an incorrectly tied or innapropriately applied knot can spell disaster in very short order.
Practicing knot tying by using a picture book can be frustrating sometimes, but thanks to the website www.animatedknots.com you can become an expert.
Knots are classified into groups such as (boating/fishing/camping/rescue/decorative/household/etc.) and all you have to do is a little mouse clicking to have step-by-step animations on your screen so you can practice to your heart's content. It's a free site, and you can even purchase an App for your smart phone so you can practice your knot tying skills anytime, anywhere.
Aside from the animated tutorials there's a host of other information relating to knots and cordage - these even the casual boater will find quite interesting, as well as a long list of links to related websites and resources.