I like this. I like it a lot. When it's possible to import my logs from SDM and plug my Suuntu into it, this program will be killer.
A couple small things though.
The tank pressure only goes up to 2902 PSI. That's a bit low, since 3000PSI is the usual start pressure for an AL80, and there are plenty of tanks that start with higher than that.
Visibility is in meters, even when you select imperial.
The drop down menus (type/structure/wetsuit) should be editable so users can add their own custom lists.
Materiel tab should be gear or equipment in English.
Stab should be BCD.
Since you have gloves and booties, shouldn't a hood be an option?
Maybe a Misc box where gear not otherwise listed can be typed in?
Thanks for the hard work. I look forward to the next upgrade.