Every stop, with its reason.

Plan open-circuit, trimix and rebreather dives on Bühlmann or Thalmann, and see the ceilings, gas switches and oxygen exposure behind every stop.

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Two families of model, side by side.

Bühlmann ZHL-16C with your gradient factors, or Thalmann's exponential-linear model in seven parameter sets. Run any plan on both and read the difference.

In the handbook Comparing models

GF 30/70TTS 39 MIN

GF 50/70TTS 37 MIN

ThalmannTTS 17 MIN

45 m on 21/35, 25 minutes, by model
Plan	Runtime	First stop	CNS	Time to surface
Bühlmann ZHL-16C, GF 30/70	67min	24m	34%	39min
Bühlmann ZHL-16C, GF 50/70	64min	18m	34%	37min
Thalmann E-L, XVal-He 2.3%	44min	12m	20%	17min

Each dive with EAN50 and EAN80 for decompression, in salt water, with a 6 m last stop.

The schedule you carry.

Stop by stop: depth, time, runtime, gas and ppO₂. Tissues, ceilings and gas density are one step away when you want them.

In the handbook Reading the schedule

Schedule · 45 m · 25 min · 21/35 · GF 30/70

Phase	Depthmetres	Timeminutes	Runtimeminutes	Gas	ppO₂bar
Surface	Surface	-	0	OC 21/35	-
Descent	45	3	3	OC 21/35	1.11
Level	45	25	28	OC 21/35	1.16
Ascent	24	3	30	OC 21/35	0.75
Stop	24	1	31	OC 21/35	0.72
Ascent	18	2	33	OC 50%	1.49
Stop	18	1	34	OC 50%	1.41
Ascent	12	2	36	OC 50%	1.19
Stop	12	2	38	OC 50%	1.11
Ascent	9	1	39	OC 50%	1.03
Stop	9	4	43	OC 80%	1.53
Ascent	6	1	44	OC 80%	1.41
Stop	6	17	61	OC 80%	1.29
Ascent	0	6	67	OC 80%	1.05

The app's schedule table: 45 m on 21/35 at GF 30/70.

Checked before the water checks you.

ppO₂, CNS and OTU, gas density, helium switches and ascent rates on every plan. When two limits disagree, the cautious one wins.

In the handbook Warnings

Must fix · 3

CriticalAir is too dense to breathe this deep: 7.1 g/L, past the NEDU limit of 6.2 g/L

CriticalCounterdiffusion risk on the gas switch from 12/60 to 50% at 21 m: helium drops 60% in one breath, past the 15% you allow

CriticalCounterdiffusion risk on the gas switch from 12/60 to 50% at 21 m: nitrogen pressure rises 0.69 bar, past the 0.50 bar you allow

Advisories · 1

Advisory18/45 is getting dense this deep: 5.6 g/L, past the SPUMS advisory of 5.2 g/L

The dive you hope not to do, planned too.

Contingencies are planned the same way as the dive, before you get wet.

In the handbook Contingency planning

Lost gas: A full re-plan for every deco or stage cylinder you could lose.
Bailout: Every bailout set on a rebreather, from the worst moment.
O₂ breaks: Air breaks, or a lowered setpoint on the loop.

After the dive, the plan is checked.

The dive you recorded comes back laid over the plan you made, scored on depth, descent, ascent rate and stops. The next plan starts from what that one taught you.

In the handbook Plan adherence

Post-dive review · 45 m on 21/35 against plan

76/ 100Adherence

PlanActual

Depth deviation: 1.5 m
Runtime vs plan: -5.1 min
Descent vs plan: +0.8 min
Peak ascent: 11 m/min

What changed vs your plan

Ascent was fast in placesYour ascent peaked near 11 m/min. Keeping ascents to ~9-10 m/min gives tissues time to off-gas.
Surfaced earlier than the planThe dive was 5 min shorter than planned: check that no decompression was cut.
6 m stop was shortPlanned 17 min at 6 m, but about 14 min was recorded there.

Stops, planned against held
Stop	Planned	Held
24 m	1 min	1.75 min
18 m	1 min	1.75 min
12 m	2 min	3 min
9 m	4 min	5 min
6 m	17 min	14 min · short

Decompression stress

Moderate27/100

A few factors added decompression stress on this dive. The notes below are where the margin is.

Top contributors

Cold during decompressionStrong evidence

Exertion at depthStrong evidence

Warm on the bottomStrong evidence

Exertion during decompressionModerate evidence

General condition & fitnessModerate evidence

Example review. For education and reflection, not a diagnosis.

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