- Messages
- 16,424
- Reaction score
- 5,230
- # of dives
- 1000 - 2499
I use tables and computer. A majority of my boat dives are square profile, so can be planned as such. I use watch and analog depth gauge. Computer as a backup and a curiousity to look at for remaining bottom time. I have a general knowledge of my air consumption and have the Air table memorized (Nitrox ones not so much). For an 80 foot "bottom only" dive I will say to an instabuddy "Lets do 10 minutes out on the wreck, cross the wreck & return for the next 10 minutes, then putter around the anchor line (which we have hopefully not lost track of) and ascend". So we're 5 minutes short of the 30 min. NDL. If no anchor line, same plan and ascend (without reference line) to safety stop. Plan varies of course with depth and other conditions. With most of my charter dives having been the typical 2 tank dive trip, there has been not a lot of variation.