Having just taken the ICC and having bought a collection of books to prepare me for the test, this book was one of them. The book itself is very minimal on the information you need, you'll often find that they've left out various bits of vital information. Markers and buoys are only the most vital and a few of the navigation lights are not in there that should be, to name just a few. You wouldn't be prepared at all if this was the only book you looked at before taking the test or even just sailing. I suggest a much more comprehensive skippers information book, not one that just lightly covers the test topics.