🤿 Dive Reference Tool

Dive Reference & Planner

3-dive NDL planner · Surface intervals · MOD table · Air & Nitrox tables — all in one place.

⚠️ FOR REFERENCE & EDUCATION ONLY. This tool does not replace a calibrated dive computer or professional dive training. Always dive within your certification limits. ScubaDiverLink accepts no liability for dive planning decisions made using this tool.

Multi-Dive Planner

Plan up to 3 dives with surface intervals. Uses Buhlmann ZHL-16B tissue tracking throughout.

⬇ Dive 1
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⬇ Dive 2
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⬇ Dive 3

Plan Summary

⚠️ FOR REFERENCE & EDUCATION ONLY. Buhlmann ZHL-16B algorithm — not a substitute for a calibrated dive computer, formal training, or professional dive planning. Never exceed your certification limits or MOD for your gas mix. ScubaDiverLink accepts no liability for any dive planning decisions.

Maximum Operating Depth — MOD Reference

MOD limits partial pressure of O₂ to safe levels. Three limits: 1.4 bar (working), 1.5 bar, 1.6 bar (absolute max).

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The Formula

MOD (m) = (ppO₂ ÷ FO₂) − 10

FO₂ = oxygen fraction (e.g. 0.32 for EAN32). Always round down to nearest metre.

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Which Limit?

1.4 bar — standard working limit for recreational dives.
1.5 bar — some agencies use this.
1.6 bar — absolute maximum. Contingency only.

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Before Every Dive

Analyse your cylinder, confirm O₂%, calculate MOD, and mark it on the tank. Never dive below MOD — O₂ toxicity can cause sudden loss of consciousness underwater.

O₂ Mix ppO₂ = 1.4 bar (Working) ppO₂ = 1.5 bar ppO₂ = 1.6 bar (Maximum)
MOD (m)MOD (ft) MOD (m)MOD (ft) MOD (m)MOD (ft)
★ Highlighted = EAN32 and EAN36. MODs rounded down for safety.

Air — No-Decompression Limits

First-dive NDL using Buhlmann ZHL-16B. EAD = Equivalent Air Depth for nitrox planning.

DepthNDL (min)Ambient PressureppO₂ at depthEAN32 EADEAN36 EAD
First dive, no prior N₂ loading, sea level. Buhlmann is typically more conservative than PADI RDP at depth.

Nitrox NDL — EAN32 & EAN36

Nitrox extends NDL by reducing N₂ fraction. MOD limits apply — never exceed MOD for your mix.

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EAN32 — Nitrox I

32% O₂ / 68% N₂. MOD = 33 m / 108 ft at 1.4 bar. Most common blend worldwide.

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EAN36 — Nitrox II

36% O₂ / 64% N₂. MOD = 29 m / 96 ft at 1.4 bar. Best for shallow reef dives.

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Equivalent Air Depth

EAD = (D+10) × (1−FO₂) / 0.79 − 10

Nitrox NDL = Air NDL at the EAD. Shallower EAD = longer bottom time.

DepthAir NDL (min)EAN32 NDL (min)EAN32 GainEAN36 NDL (min)EAN36 GainEAN32 MOD?EAN36 MOD?
⛔ = depth exceeds 1.4 bar working MOD. NDLs via Buhlmann ZHL-16B first-dive.