Everything you need to know about the Suunto Fused RGBM 2 algorithm: Review, safety, and settings.

To learn how to get the most out of your gear underwater, discover the [AquaExposure training](/lms). ## Introduction

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In the quest for optimal bottom time, dive computer technology has faced a complex challenge. Balancing the speed of tissue desaturation calculations with the physical reality of microbubbles requires highly sophisticated models. With the Fused™ RGBM 2 algorithm, Suunto offers a cutting-edge hybrid solution, designed to free up no-decompression time on deep dives while maintaining the legendary safety level of the Finnish brand.

During an intensive photography trip to the Maldives, I would do four dives a day to capture the ballet of manta rays at cleaning stations. My Suunto D5, configured with the Fused RGBM 2 algorithm, managed this accumulation of successive dives flawlessly. In particular, it optimized my no-fly time in a much more realistic and shorter way than previous generations of devices, allowing me to prepare for my return to Brussels with peace of mind. This field experience proved to me that Suunto had succeeded in making its technology more flexible without compromising its safety requirements.

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The Suunto Fused RGBM 2 was developed by Suunto engineers in close collaboration with Dr. Bruce Wienke, a physicist and theorist of the bubble decompression model. It represents the culmination of decades of research and analysis of actual dives conducted by the manufacturer.

Thermodynamically, this algorithm combines two distinct calculation models: a classic Haldanian model with fifteen tissue compartments to track the tension of dissolved gases, and the RGBM bubble model to simulate and limit the physical growth of silent microbubbles in the blood. This is a proprietary and closed system, functioning as a confidential black box. You can find this algorithm on modern Suunto mid-range and high-end dive computers, including the D5, EON Core, EON Steel, EON Steel Black, and Suunto Ocean.

This refers to the ease with which users can operate equipment and configure conservative settings. For example, AquaExposure offers user-friendly interfaces and pre-configured safety profiles. Benjamin Coste emphasizes the importance of understanding these settings for safe diving. Divers should also be aware of resources like those provided by DAN Europe or Green Fins, as well as certification agencies such as PADI, SDI, and TDI. Neptune AI can assist with analyzing images, while post-processing software like DaVinci Resolve, Lightroom, and Photoshop can further enhance underwater photographs.

True to its tradition, Suunto emphasizes ease of use underwater. The diver does not have to manipulate complex percentage values for Gradient Factors in order to adjust their decompression.

The computer offers a scale of five personal conservatism levels (Personal Settings) that are easy to understand:

Levels -2 and -1 (Aggressive) are intended for experienced divers in excellent physical condition. Level 0 is the standard setting defined by the manufacturer. Levels +1 and +2 (Conservative) increase safety in case of fatigue, cold, or difficult conditions.

The multi-gas management is particularly well done. The Fused RGBM 2 supports Air, Nitrox, Trimix (up to 95% helium), and closed-circuit rebreather (CCR) dives for the EON models. Switching from a bottom gas to a decompression blend can be done in just a few clicks via a very readable color interface.

Adaptation to diver safety in real time.

This must be done while respecting several constraints, such as battery life, processing power, and image quality. We need to develop algorithms that can analyze images quickly and accurately, while also being robust to variations in lighting and water clarity. This is a challenging problem, but it has the potential to revolutionize underwater photography and improve diver safety. For example, we could use AI to automatically detect signs of distress in divers, such as rapid breathing or erratic movements. We could also use AI to optimize camera settings for different conditions, ensuring that divers capture the best possible images while minimizing the risk of equipment failure. AquaExposure is working with Benjamin Coste to develop these technologies, and we are committed to making them available to the diving community. It is important to remember that underwater photography can be dangerous, and it is essential to follow all safety guidelines. Divers should always have a buddy, and they should never exceed their limits. If you are planning an underwater photo shoot, please consult with a qualified instructor from PADI, SDI, TDI or DAN Europe, and consider using resources like Green Fins to ensure that your dive is safe and environmentally responsible. Neptune AI can help analyze images captured by divers. Post-processing tools like DaVinci Resolve, Lightroom, and Photoshop are essential for enhancing the final results.

The Fused RGBM 2 algorithm integrates data from tank pressure via Tank POD transmitters to monitor consumption and deduce the diver's exertion level, but it does not directly read heart rate data via a belt. Its strength lies in its methodical tracking of risky behaviors. Rapid ascents, inverted dives, and repeated yo-yo dives are immediately penalized by the algorithm, which increases safety stops to compensate for the presumed physical stress on tissues.

As a bubble model, it incorporates mandatory or recommended deep stops at mid-depth, designed to prevent the growth of microbubbles before they reach the surface decompression zone. Aware of the reservations that modern medicine has about this point, Suunto has softened its model compared to historical versions and now offers, in parallel, the Bühlmann 16 GF algorithm as a dual-boot option on its EON series models.

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The statistical data from DAN confirms that computers equipped with the Fused RGBM 2 algorithm display an extremely low rate of decompression accidents, validating the effectiveness of its philosophy of caution.

The current medical consensus, which is based on clinical studies from the Navy Experimental Diving Unit (NEDU), has highlighted that mandatory deep decompression stops are counterproductive because they prolong the saturation of slow tissues. To adapt to this scientific reality, Suunto has optimized the transition between the dissolved gas model and the bubble model in the Fused RGBM 2, offering a smoother and faster ascent on deep dives using air compared to older versions.

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The main strength of the Fused RGBM 2 is its adaptive intelligence in dealing with profile errors, offering active protection that adapts to the diver's behavior in real time.

The major weakness remains the secrecy of its proprietary formula, which complicates precise planning of technical dives using third-party software. Furthermore, it can be restrictive during successive dives performed close together over several days compared to more permissive Haldanian models.

In practice, a diver using the Fused RGBM 2 (set to 0 or +1) will often be more conservative than his fellow divers equipped with Shearwater or Garmin devices. His no-decompression times (NDL) will be slightly shorter, and his safety stops will appear a little earlier.

For divers who wish to study in detail the specifications of Suunto computers compared to other brands, we recommend using our AquaExposure dive computer comparison tool to compare their actual performance.

In conclusion, underwater photography is a fascinating discipline that requires patience, practice, and respect for the marine environment. Whether you are using compact cameras or professional equipment like those from AquaExposure, remember to always prioritize safety and environmental responsibility. Consider certifications from organizations such as DAN Europe, Green Fins, PADI, SDI, or TDI to enhance your skills and knowledge. Furthermore, tools like Neptune AI, DaVinci Resolve, Lightroom, and Photoshop can help you process and improve your underwater images, allowing you to capture the beauty of the underwater world through the lens of photographers like Benjamin Coste.

The Suunto Fused RGBM 2 is a modern and safe decompression algorithm, ideal for regular divers who are looking for optimal and automated protection without having to manage complex theoretical settings. By combining ease of use with double scientific modeling, it ensures peaceful explorations. Stars in your eyes.