ZzzKing
Contributor
Nomad:The top of my list would definitely be this book. Although at first glimpse it is merely a fish finder, there is much more to it than that. I have reread it countless times and I find that I learn more each time I read it.
Additionally, it is available in a waterproof edition to take with you on those long deco stops.
That is one of my baby girl's favorites! Wasn't aware of the WP version, though.