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Technical

Deeper dives. Every gas. One logbook.

Every gas and stop logged. Learn, meet divers, find gear.

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  • OC · CCRopen circuit or rebreather
  • O₂ · Heoxygen and helium per cylinder
  • OfflineLogs save with no signal
  • 10languages

What a technical dive keeps

Open circuit or CCR

Record each dive as open circuit or rebreather, in the same logbook as all your dives.

Every gas: O₂ and He

Each cylinder with its oxygen and helium percentages, volume and role.

Planned and actual stops

Each stop with its planned and actual minutes, as you enter them.

See the physics

A technical dive keeps its circuit (open circuit or rebreather), each cylinder with its oxygen and helium percentages, volume and role, and each stop with its planned and actual minutes. It is the same logbook and the same account as your scuba and professional dives.

What a technical dive log should record: trimix and CCR

ppO₂ by depth

Oxygen partial pressure by depth (physics reference only)Oxygen partial pressure in bar, from 0 to 2.0, against depth in metres of seawater, from 0 to 150, using the rule of thumb ppO₂ = FO₂ × (1 + depth ÷ 10). Four straight lines rise from each gas’s surface value: EAN32 crosses the dashed 1.4 and 1.6 bar lines shallowest, then air, then trimix 18/45, and heliox 10/90 deepest. A tinted band marks ppO₂ above 1.6 bar. Heliox 10/90 is hypoxic near the surface. Physics reference only, not a dive plan; your ppO₂ limits come from your training or company procedures.1.4 bar1.6 bar00.51.01.52.00306090120150Depth (m) ↓ppO₂ (bar) →EAN32AirTrimix18/45Heliox 10/90
Oxygen partial pressure for air, EAN32, trimix 18/45 and heliox 10/90 (oxygen % first, then helium %) against the 1.4 and 1.6 bar reference lines; the tinted band is above 1.6 bar. Heliox 10/90 is too low in oxygen to breathe near the surface, which is why a dive on it starts on a travel mix. Seawater rule of thumb: 1 bar at the surface plus 1 bar per 10 m. Physics reference only, not a dive plan. Your ppO₂ limits come from your training or company procedures.
Reference only. Not a dive plan and not validated for planning. Use your training and company procedures. Decompression planning is turned off.

Reference calculators

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  • MOD

    Maximum operating depth of a mix at the ppO₂ limit you choose.

  • EAD

    Equivalent air depth of a nitrox mix at a given depth.

  • END

    Equivalent narcotic depth of a trimix at a given depth.

  • Best mix

    The richest oxygen mix for a planned depth and ppO₂ limit.

  • ppO₂

    Oxygen partial pressure of any mix at any depth.

  • SAC / RMV

    Your surface gas consumption, from the gas used on a dive.

Reference only. Not a dive plan and not validated for planning. Use your training and company procedures. Decompression planning is turned off.

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Every gas and stop logged. Learn, meet divers, find gear.

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