If you really want to understand diving, go grab the
NOAA Diving Manual it is quite possibly the best single source of diving information out there.
On this we agree....however...
It is geared towards a particular type of diving, and must be read with that in mind
Which is precisely why I didn't recommend it for this diver at this stage of his progression.
but it is much more carefully edited and written than the "Encyclopedia."
which is your personal opinion, which you are entitled to
Which, frankly, is an amazingly poorly written and edited collection of idiocy.
which is a totally idiotic opinion, unless you are an author or editor of Diving Manuals for entry level recreational divers.
Here are some independent reviews of the ERD:
"While the Encyclopedia of Recreational Diving is a very informative book, it is not the "heavy" reading that one might expect from a PADI manual. The terminology and concepts covered in this book nicely supplement what one learns throughout the recreational diving classes -- novice open water dives, advanced techniques, underwater navigation, and rescue techniques.
I recommend this for divers who have gone through open water and advanced classes (and even Rescue), feeling that they did not get all they could out of the classes and textbook. This book is a must for those wishing to seek a professional dive rating (divemaster and higher), or pursue technical dive certifications."
"PADIs Encyclopedia is a great book! Im both PADI and NAUI certified, currently getting my Divemaster certification through NAUI and even my NAUI instructor recommended I get this book because its so thorough. Reading it from cover to cover not only helped reinforce information I'd learned for my Master Scuba Diver course but it explained certain things (ingassing, for one) better than my textbook did. Now that I'm going to be working in the dive shop as well, its helped as a quick reference with certain questions customers have come in with. This new version is an easy read with great pictures, drawings and colors for those easily bored by pages of nothing but text. I think its an invaluable resource."