We have used this book extensivly. I (Dustin) am a mechanical engineering and have a FAA airframe and powerplant license thus am no stranger to mechcanical equipment or electricity. The respect I hold for this book is amazing. It is written in a clear and pointed method that will help both the virgin repair person or the experienced mechanic greatly. This book is an absolute must have if you own a boat, think you want a boat, or even think you may think you want a boat! Order below.