The Scuba Gear Lab

Dive Computer Algorithms Explained: Understanding Decompression Models


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Ever wondered what's actually happening behind the screen of your dive computer while you're underwater? Most divers trust their computer without understanding the algorithm that's calculating nitrogen absorption, off-gassing rates, and decompression limits in real time. In this episode, you'll learn how dive computer algorithms work, why different computers give different no-deco limits, and how understanding these models can make you a safer, smarter diver.

• Dive computer algorithms track nitrogen absorption across multiple tissue compartments that load and off-gas at different rates, using models like Bühlmann, RGBM, DSAT, and VPM to calculate your no-deco limits in real time.

• Conservative algorithms like RGBM give you shorter bottom times but lower theoretical DCS risk, while liberal algorithms like DSAT allow longer dives, which is why two divers on the same profile can have different no-deco limits depending on their computer brand.

• Most recreational DCS incidents happen within algorithm limits because these are probabilistic models, not guarantees, and individual factors like dehydration, cold water, exertion, and body composition affect your actual risk in ways no algorithm can perfectly predict.

• You should manually add conservatism to your dive computer settings when diving in cold water, doing multiple deep dives per day, when you're tired or have other risk factors, because the default algorithm calculations don't account for all real-world conditions.

Links to any products or resources mentioned in this episode can be found at https://thescubagearlab.com/dive-computer-algorithms-explained.

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The Scuba Gear LabBy The Scuba Gear Lab