This book will not turn you into a natural navigator after you read it. A s some reviewers wish it would. Rather it is a book that teaches you how to teach yourself to navigate without gps or compass, etc. It takes work, lots of it. And this book shows you how to get there. Its similar to the kamana program. Your not gonna be a naturalist just by buying and reading the material once and thats it. But you WILL if you work the program. Can you learn this stuff else where? Of course you can. But since we bought this book, we obviously are in need of finding this information. To sum it up, the book is excellent, but you have to work hard to get the benefit.