While I'm sure this book might have some uses, it was certainly not what I was looking for. It didn't really help me find piratey ways of saying things I wanted to say. Many of the words defined in the book seem like perfectly ordinary words with ordinary definitions, for example, "INDIGENOUS - originally from the country in question." Nothing very pirate-like about that. Others just don't seem to make much sense. In some cases, this may be a result of poor translation from Spanish, or perhaps an errant cut and paste, as in this example: "INN - Speaking of the sea, rivers, ponds, wells, etc., a solid surface on which the water is." In other cases the definition just seems wrong, such as this one: "MONADNOCK - low hummock that is in the middle of the sea. Some offer shelter or anchorage." I haven't found any other sources that talk about monadnocks in the middle of the ocean. Some definitions are just odd "MODERATE - It is said of the gentle and gentle wind."
So, not a particularly helpful book to me. I suppose if I wanted to learn the names of sails it might be helpful, but there are many other places to learn this, and I would not particularly trust this source.