A plan on Thalmann GF Calibration runs two decompression models rather than one, and the Review step then grows a last view, GF Calibration, holding what the second model said. Under Bühlmann ZHL-16C and Thalmann E-L there is no second model and no view.
GF Calibration
Thalmann GF Calibration does not take a gradient-factor pair; it produces one. The view opens with the answer:
- GF Low and GF High: the pair the planner fitted, as percentages.
- TTS Delta, in minutes: how much longer or shorter the fitted Bühlmann schedule is than the Thalmann schedule it was fitted to.
- Max divergence, in metres, between the two ceilings.
Decompression stops
| Depth | BHL (fitted) | Thalmann | Difference |
|---|---|---|---|
| 15 m | 1.0 min | 1.0 min | = |
| 9 m | 2.0 min | 3.0 min | -1.0 min |
| 6 m | 23.0 min | 22.0 min | +1.0 min |
Below them the chart draws both ceilings and the depth profile, over a row naming the Thalmann parameter set used as the reference. A Decompression stops table puts the two schedules side by side.
GF Low and GF High fields sit at the top of the card. Left alone, the card reads Auto-solved; type into either field and it switches to Manual comparison active, comparing your pair against the Thalmann reference instead. Reset to auto-solve returns it.
A fitted pair is a translation between two vocabularies, not an equivalence: it holds for one dive on one parameter set, and changes with the depth, the bottom time or the gases.
On a rebreather
The scenario picker does not appear on this view. The algorithm that produces it also refuses bailout planning, so it has no scenarios to show. See Bailout scenarios.
Next
Warnings, and The GF solver for what a fit does and does not tell you.