LSP D-PLANNER · Rec

Bühlmann ZH-L16C models 16 tissue compartments with N₂ half-times from 4 to 635 min. Bars show saturation relative to GF-adjusted M-value. Calculate a dive on the Planner tab first.

Generates a full ascent profile with deco stops using Bühlmann ZH-L16C + Gradient Factors. Configure up to two decompression gases below — they switch automatically at the specified depths during ascent and are factored into tissue off-gassing.

Rec (Recreational Dive Planner): A conservative lookup table derived from the Bühlmann model and US Navy tables. Fixed depth/time grid — easy to use, no computation. Uses pressure groups (A–Z) to track nitrogen load between dives. Best for recreational divers within 40 m.

Bühlmann ZH-L16C: Full tissue compartment model by Dr. Albert Bühlmann (Zürich, 1983). Computes N₂ saturation per-minute using the Schreiner equation across 16 parallel compartments. Gradient Factors (Baker, 1998) add a safety buffer. Used in virtually all modern dive computers. More precise for multi-level and multi-day diving.

When to use which: Rec for simple recreational dives with a table-based approach. Bühlmann for dive computer-style planning, deeper dives (30–40 m), technical diving consideration, or when you want to understand what your computer is computing.