The title of this book should read "An introduction to boat electrics". It is a very good introduction however it will not prepare you to design, wire or maintain an electrical system of any complexity. Having said this, I bought the book when first published and found it excellent for the novice. I would suggest that after reading this volume that you continue with more detailed and advanced books. It is not a bible and one should not gain a false sense of skill after reading it. That would be dangerous.