Dive computer algorithms are essential tools for modern scuba divers. At Santorini scuba academy SSI Training Center in Santorini, we offer a specialized SSI Computer Diving Specialty Course to teach you how these life-saving tools work. In this guide, we’ll explore the most common dive computer algorithms, their history, and why understanding them is crucial for safe diving.
What Are Dive Computer Algorithms?
Dive computer algorithms are mathematical models used by dive computers to track nitrogen absorption and release in your body during a dive. These algorithms calculate your no-decompression limits (NDL), decompression obligations, and safe ascent rates. Simply put, dive computer algorithms help you avoid decompression sickness by monitoring your dive profile in real time.
History of Dive Computers and Algorithms
The first dive computer, the SOS Decompression Meter (1950s), was an analog tool that gained the nickname “Bend-O-Matic” due to its inaccuracy. The first true digital dive computer, the Orca Edge, debuted in 1983. It used a simplified version of the Bühlmann algorithm and laid the foundation for today’s advanced models. Since then, dive computers and algorithms have become essential for every diver’s safety.
How Nitrogen Bubbles Affect Divers
When you descend underwater, increased pressure causes nitrogen to dissolve into your body tissues. If you ascend too quickly, nitrogen can form dangerous bubbles in your bloodstream. These bubbles can lead to decompression sickness (DCS), also known as “the bends.”
Dive computer algorithms work by estimating nitrogen levels in your body and calculating how to safely off-gas this nitrogen during your ascent, minimizing the risk of DCS.
Types of Dive Computer Algorithms
There are two major types of dive computer algorithms:
Dissolved Gas Models
These models track how nitrogen is absorbed and released by different tissues in your body.
- Bühlmann ZHL: A highly adjustable and widely used model.
- Pelagic DSAT: Based on U.S. Navy tables, allows for longer bottom times.
- PZ+ (Aqua Lung): A more conservative variation of Bühlmann ZHL.
Bubble Models
These also consider bubble formation in your tissues, adding a layer of safety.
- RGBM (Reduced Gradient Bubble Model): Adds conservatism for repetitive dives.
- VPM (Varying Permeability Model): Focuses on microbubble control with deep stops.
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Popular Dive Computer Algorithms in Detail
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Bühlmann ZHL
- Developed in Switzerland by Dr. Albert Bühlmann.
- Uses 16 tissue compartments.
- Gradient Factors allow divers to adjust safety margins.
- Found in Shearwater, Garmin, and Scubapro computers.
RGBM (Reduced Gradient Bubble Model)
- Developed by Dr. Bruce Wienke.
- Includes bubble formation in calculations.
- Common in Suunto and Mares dive computers.
DSAT (Pelagic)
- Based on U.S. Navy research.
- More liberal with bottom times.
- Used in Oceanic and Aeris models.
VPM (Varying Permeability Model)
- Focuses on minimizing microbubble formation.
- Emphasizes deep stops.
- Popular among technical divers.
PZ+ (Aqua Lung)
- Based on Bühlmann ZHL.
- Automatically adds conservatism.
- Designed for safe recreational diving.
Why Understanding Dive Computer Algorithms Matters
Using a dive computer without understanding its algorithm can lead to unsafe dive planning. Each algorithm reacts differently to:
- Depth changes
- Repetitive dives
- Multi-day diving
In our SSI Computer Diving Specialty Course, you’ll learn how to:
- Understand your dive computer’s algorithm.
- Safely plan dives based on your computer’s logic.
- Adjust gradient factors and conservatism settings.
- Avoid decompression sickness through informed diving.
Enroll in Our SSI Computer Diving Specialty in Santorini
At our SSI Training Center in Santorini, we offer:
- Experiense in various algorithms.
- Hands-on training with real dive computers.
- Flexible schedules and small groups.
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Location: [Santorini scuba academy], Santorini
When: Weekly sessions
Book Now: info@santoriniscubaacademy.com