I cannot agree with the two previous reviewers. I found this book a dissapointment. It is just a complete rush through all the important subjects with very poor explainations. It is very badly written, and the constant need to keep refering from the text to "extracts" at the back pages is frustrating. The book is padded out with a large Glossary of words than any sailor should well know by this stage of their education.
The worked examples are impossible to properly follow without having to hand the proper actual charts that they refer to.
The "exam" questions and "answers", are a usefull indication of the knowledge required for this subject, but will appeal, I feel, to those who think that knowledge of a few answers will make them sailors, without a true understanding of the subjects.
If you are serious about understanding the subject, for the safety at sea of yourself and others, I suggest there must be better books than this one you could aquire