Support

Something wrong, or a number you disagree with? Write to turnpressure@ismailov.net. If it is about a specific plan, include the depth, cylinder, mix and air number you used — that is enough to reproduce any figure the app shows.

Common questions

Why isn't my minimum gas just 50 bar?

Because it is computed for your depth, your cylinder and how hard you breathe, rather than being a fixed number. Two divers sharing one supply from 30 m need more gas from a small cylinder than a large one, because the same volume of gas is a larger fraction of a small cylinder's pressure. At a Typical SCR of 20 L/min, the same ascent from 30 m needs 45 bar from a 15-litre steel — under the 50 bar habit — and 61 from an aluminium 80; a heavier breather or a current asks for more. That gap is what the app was built to show.

Your bottom-time limit doesn't match my computer.

It probably will once you match the conservatism. Settings › How the bottom-time limit is worked out offers the standard gradient-factor pairs — 30/70 through 100/100 — and the app defaults to 45/95. Set it to whatever your computer is running.

Two differences will remain even then. The app plans a square profile to your maximum depth, while your computer follows the dive you actually did, so its number will usually be more generous. And the app assumes a repeat dive followed a full dive to the same depth on the same gas, because it has no way to know what you really did. Both differences run in the same direction: the app is the more cautious of the two.

How does it know what I breathe?

Only what you tell it. Pick a tier if you have never measured it, enter one real dive's numbers and let it work the rate out, or type a figure you already know. Everything you enter stays in a dated list, the newest is used, and you can pin an older one or delete any of them.

Does it work without a signal?

Always. The app does its calculations on the phone, so a boat with no reception changes nothing.

Will it tell me a dive is safe?

No, and it never will. It does gas arithmetic and a bottom-time limit before you get in. Your training comes first, and in the water you go by your pressure gauge and your computer.