Atlas-Deco

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Parameters
Dive
Route (legs)
Depth and runtime at end of each leg ; runtime 0 = gas switch during descent (travel gas). Order is followed.
Depth mRuntime minTankMixO2 %He %MixTankLStartReserveBottom gas
Approach / travel leg from a distance
Time = distance ÷ (speed × current factor). Adds a leg at the given depth before the bottom, and a return leg after it if ticked. Distances must come from your own measurement or a sourced site sheet.
Onboard: Diluent & Oxygen
CCR Tanks & Loop Parameters
The diluent is breathed on every leg (loop) ; in "tanks only" it is also an output of the ranking and stays editable.
Onboard tanks: O2 use = metabolic VO2 × loop time; diluent = loop volume × descent pressure rise + flushes at max depth. Both × safety factor. Estimates, not measurements.
TankLStartReserve
O2
Dil
Deco gases and tanks
RoleO2 %He %MixLTankStartReserveLostOpt.
Parameters

Rates

Stops

Breathing

ppO2 limits

Gas switch depths (MOD) by O2 fraction:

Narcosis

O2 toxicity

Environment

Advanced parameters
Manual stops
Depth m, duration min, one per line. Imposed stops are recomputed into the plan. Too short a stop is shown in red with the GF reached at the next stop.
Tanks & gas lists
Gas lists: one block per list, "[Name]" then "bottom:" and "deco:" lines of O2/He mixes, deco mixes may carry "@minDepth". Tank presets: one per line "Name = litres, working pressure, reserve, max pressure" (bar). Saved in this browser.

Educational software · use at your own risk

Atlas-Deco is a planning and learning tool, provided free of charge, as is and without warranty of any kind. It does not replace training from a recognised agency, a qualified instructor, a dive computer, validated tables or your own judgement. Only plan dives that are within your certification, your experience and your equipment.

Decompression models are mathematical approximations of human physiology: following a plan computed here, even to the letter, cannot guarantee that you will avoid decompression sickness, oxygen toxicity, injury or death. The software may contain errors. Check every value against an independent source before diving, never rely on a single source of information and always have a backup plan.

You alone are responsible for your dives. By using this software you accept all the risks; to the fullest extent permitted by law, the author and contributors accept no liability for any use made of it.