▚ DECISION PAGE ▚

Bühlmann vs RGBM

The algorithm argument, minus the forum shouting.

Bühlmann ZHL-16C is the open, documented dissolved-gas model most modern computers run, tunable with gradient factors. RGBM is Suunto’s proprietary implementation with bubble-model ideas and a reputation for conservative calls on repetitive days. Neither is "wrong" — they just call the same dive differently, and you should know which voice your wrist speaks.

▚ BÜHLMANN ZHL-16C

Enthusiast/dealer-channel gear — we keep this side editorial rather than link a marketplace listing that may not be the real thing.

▚ RGBM

Enthusiast/dealer-channel gear — we keep this side editorial rather than link a marketplace listing that may not be the real thing.

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Head to head

Axis	Bühlmann ZHL-16C	RGBM
Transparency	Published, open math	Proprietary implementation
Tunability	Gradient factors	Fixed personal/altitude steps
Repetitive dives	Predictable NDL behavior	Can shorten NDLs noticeably
Who runs it	Shearwater, Garmin, many	Suunto family

Read the full breakdown →

▚ TRAINING NOTEDive within your training and certification. This is gear research, not dive instruction, and not a substitute for training from a certified instructor. Service intervals and no-fly figures cited on this site are illustrative — follow your manufacturer’s manual and your agency’s / DAN’s guidance.