bottom times anyway. Not relying on the computer to keep track of them for you. Finally, do not let anyone plan your dives for you. Especially a DM or Guide. And don't follow them if their plans make you uncomfortable or don't mesh with yours. The "We do this all the time, you'll be fine" gets people hurt. Always have a back up plan even if you do decide to follow the DM or Guide so you can end your dive at any time regardless of what they do.