This book was a complete waste of money for me. I am quite interested in diving solo and as such have progressed to PADI Rescue Diver and read Technical Diving magazines. However if you do this then there is nothing in this book that will be new to you. Basics of Nitrox, Pony Tanks, and corrent management of yourself and equipment will all be familiar to you. If you're not an RD then you should NOT be thinking about diving solo as you will not be experienced enough to problem solve during a crises and this book is certainly not going to give you that or the specialist knowledge you need. In all I was very dissapointed. I expected proceedural information, checklists, equipment recommendations (outside of the norm such as transponders on the 155.5 Mhz band for Air/Sea rescue). The book is thin and is further padded with stories on why people dive solo. Do yourself a favour. If you want to dive solo look elsewhere and do some research and update your skills.