As an active diving instructor (NAUI, IANTD, NSS-CDS, and NACD, among others) and author on scuba diving safety (The Antarctic Research Diving Manual, IANTD's Understanding Rebreathers, and about 200 diving articles in magazines), I always read new references on diving with a critical eye. When I received my copy of the 4th Edition of the NOAA Manual, I expected to see the same, old, tired information presented in the same, old, tired way as in the Third, Second, and First Editions. In short, I expected "more of the same." I was wrong.
I was pleasantly surprised to find that Jim Joiner, as the Senior Editor, had not fallen into that trap. Jim did an excellent job of getting his individual contributors and reviewers to put fresh thought, material, and graphics into their work, measurably improving the content and readibility of the text. Already one of the "standard" texts on diving, this edition of the NOAA Manual far surpasses the previous editions, and provides up to date information on a wide range of subjects and procedures.
If you are at all serious about diving, this book is a "must have." Buy one now, even if you already have the earlier editions... it is well worth the money!