You obviously ran into the Luddites from the Amish Diving Society! "Break the machine! The machine is evil! Go back to the righteous days of hand calculations chiseled on stone!" they cry!
Most tech divers use a deco program on a desk or laptop, a wrist- mounted deco computer (sometimes two), and have a depth gauge, bottom timer, and slates in the pocket as back-up!
When you fly or dive, there is NOTHING like having redundant safety systems available! :grad:
