you should definitely try to get this book. I am a landlubber, who has just discovered the pleasures of Hornblower and Aubrey/Maturin (via Austen's Persuasion). Along with a number of more serious naval non-fiction reference works, notably THE WOODEN WORLD by N.A.M. Rodger (ISBN 0393314693; ASIN 0393314693)I found a copy of this wonderful book first at my public library and then in a sale at my local store.
This is an oversized book, thin but full of detailed information. A man-of-war, one of the mainstays of the Georgian fleet during the wars of the 1700s and early 1800s, is "cut away" section by section and deck by deck to illustrate life on board as well as the structure of the ship. The first works better than the latter, although I got a very good idea of how the ship's anchor works as well as how the ship crew handled guns and gunpowder (as well as the dangers of a loose gun). I wished that the authors had provided a bird-eye view of the ship from the top of the masts, and showed sailors working the sails. Apart from this and other minor quibbles, I think I learned more from this book faster than I had expected.
Yes, this is a children's book, but it is highly recommended by sites specializing in naval fiction of the Georgian and Regency era (think Napoleonic Wars, Revolutionary Wars, as well as sites devoted to O'Brian and Forester). Children will be delighted by various grosser aspects of life abroad (the very basic toilet and bathing facilities, the surgeon in action during battle, and of course the maggot-filled biscuits), not to mention trying to find a certain stowaway. Adults will revel in little details that explain things that have puzzled them.
I started out not knowing port from starboard, and very little else. By the end of this book, while I cannot claim to be proficient, I certainly understand that a ship has three masts in several sections, that it has several decks, and that life at sea was more complicated than is sometimes depicted in fiction.
You might also want to try "The Visual Dictionary of Ships and Sailing" (ISBN 1879431203; ASIN 1879431203) which apparently discusses different types of ships, the sails and ropes, and so forth. I have not seen this book yet, but it looks interesting.