Lplanner

Lplanner is a decompression planner for trained mixed-gas divers. It plans

open-circuit and closed-circuit dives on air, nitrox, trimix and heliox, with

three decompression models to choose between.

THIS SOFTWARE CAN KILL YOU. It is experimental and certainly contains bugs.

Never dive a schedule from it without verifying that schedule against tables

or software you trust, and never use it without formal mixed-gas

decompression training.

MODELS

* ZHL-16C — the Buhlmann set, with gradient factors or a conservatism

percentage, and optional Pyle deep stops.

* VVAL-79 — the U.S. Navy Thalmann EL-DCM, exponential uptake and linear

elimination, with the published nine-compartment air parameter set. Air,

nitrox and oxygen only: the Navy publishes no helium parameters for this

model, so a dive carrying helium is refused rather than computed against

numbers that do not exist. Use VPM-B or ZHL-16C for trimix.

* VPM-B — the Varying Permeability Model of Yount and Hoffman, in Erik Baker's

implementation, with conservatism 0 to 4. Checked against Baker's own

published output on his 80 msw trimix benchmark: 13 of the 18 stop times

match exactly, with the first stop one 3 m increment deeper and four minutes

more total stop time, for the reasons set out in the manual.