Conservatism Setting — What It Is and Why It Matters
A conservatism setting is a user-adjustable parameter on a dive computer that adds an extra safety margin to the decompression algorithm's calculations. Increasing conservatism shortens your no-decompression limits and requires longer or deeper decompression stops, reducing your theoretical risk of decompression sickness.
Different brands implement conservatism differently. Some use simple Low/Medium/High presets. Computers running Bühlmann algorithms often use gradient factors (expressed as two numbers like GF 30/70), which give the diver granular control over deep-stop and shallow-stop conservatism independently. Most instructors recommend diving with at least moderate conservatism.
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Frequently Asked Questions
Should I use the highest conservatism setting?
Not necessarily. The highest setting significantly reduces bottom time and may be more restrictive than warranted for fit, well-hydrated divers doing shallow recreational dives. A moderate setting is a reasonable starting point; increase it if you have risk factors like age, dehydration, or fatigue.
What are gradient factors?
Gradient factors are a pair of numbers (like GF 30/70) that control how conservatively a Bühlmann algorithm handles deep stops (the first number) and ascent ceiling (the second number). Lower numbers mean more conservative. Common recreational settings range from GF 30/70 to GF 40/85.
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