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Suunto Eon Steel Black Review


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Suunto has pulled out all the stops with the Eon Steel Black


Suunto has pulled out all the stops to firmly establish the EON Steel Black as the must-have dive computer among the more advanced and tec dive fraternity. The device is CCR, Tri-Mix and Multigas compatible. Suunto has even equipped the EON Steel black with two algorithms, their proprietary Fused 2 RGBM and the Buhlmann 16GF, in a clear attempt to dispel any lingering doubt about the conservatism of their computers.

I was intrigued to see how the two algorithms would stack up against each other and eager to test how easy the device is to use. To put the Eon Steel black through its paces, we went for two dives on the impressive wreck of the Ex-HMAS Brisbane, which sits at a depth of 30 meters.

Suunto Eon Steel Black Review

General use and features

As you would expect from Suunto, the EON Steel Black is well designed, aesthetically pleasing, and durable. The first thing I noticed when I took it out of its box was the unit's weight; it felt reassuringly heavy and capable of taking a lot of punishment. It also looks very stylish with a black brushed stainless steel front cover and chunky stainless-steel buttons, conveniently aligned down the right-hand side.

For a computer that boasts a considerable amount of functionality, it is remarkably easy to use. Without reading a manual, I could easily set the time and date. Nitrox and tank pairing was simple, as was turning off all those unwanted and often annoying alarms. It is sensible to read the manual if you are going to start playing around with the algorithms and gas mixes, but overall, I found the menus to be intuitive and easy to navigate.

What also helps is the large colour screen this computer boasts. With its anti-glare coating, I found the EON Steel Black as easy to read in the full glare as in the bowels of the wreck. The screen also means that the compass feature is very usable.

Other features include a USB rechargeable battery that offers a whopping 40-hour charge. The device will also retain this charge during long periods of inactivity as it goes into a deep hibernation when not in use. It is rated to 150m meters and, for some reason, can be paired with 20 tank pods simultaneously; I am not sure under what circumstances you would need this particular feature, but is their none the less!

Suunto Eon Steel Black Review


As with almost every electronic device these days, the Suunto has an app, Bluetooth connectivity and GPS. This is simple to set up, and I could upload my dive details, display them in the form of a standard log or a graph format, add pictures, and easily and quickly share on social media. For increased features and functionality and to facilitate more in-depth planning, there is the Suunto DM5 program for both Mac and PC.

This program will be of particular interest to tec diviners who like to plan each dive meticulously. The DM5 program also allows the display and screen options to be customised. There are three different display layouts to choose from, with further customisation within each layout possible.


As I mentioned earlier, the EON Steel black has two algorithms, but thankfully this is not as complicated to navigate as it sounds. You have a choice before you start the dive to pick which one you prefer to use.

The Fused 2 RGBM – This new algorithm has been developed by Suunto with the more advanced diver in mind, giving greater flexibility to adjust personal settings. This algorithm offers an easy way to adjust how aggressive or conservative you wish to be on a dive with five present options.

Buhlmann 16 GF – With adjustable gradient factors, this algorithm allows a diver far more control over how conservative or aggressive they would like to be on a dive.

So, to sum up, what can become a highly complex discussion about algorithms, the RGBM has a certain amount of safety built-in while the Buhlmann leaves it pretty much up to the diver. The Suunto Fused 2 is less complicated and can be run aggressively if needed. In contrast, the Buhlmann with its gradient factors allows for great flexibility but requires a greater understanding of decompression and technical diving to use safely.

Suunto Eon Steel Black Review

While on my test dives, we ran both algorithms side by side, and I was surprised that there was very little difference between the two. Granted, I was only at a max depth of 30 meters for both of my dives and was not planning on any deco diving. Still, with previous Suunto computers like my old Vyper, my second dive would have been incredibly restrictive at that depth.

Suunto has now also removed the lockout feature for both algorithms, which means that you will not get locked out of the computer while on a dive if you have violated a deep or safety stop. Instead, the device will continuously recalculate deco stop if several are missed on an assent, which tec divers have been eager to see redressed.


Nice styling and ease of use have never been an issue with Suunto products, the real test of the EON Steel Black was to see how it performs as a Tec computer. Suunto has long held a reputation for being too conservative, punishing a diver for not doing as the computer has instructed and even locking out while still on a dive! An unforgivable sin in the eyes of some divers.

These drawbacks have now been redressed, and Suunto has created an incredibly versatile dive computer that is great for recreational divers because it is as easy to use as you want it to be. It also ticks all of the boxes for the hardcore tec diver with the option of two algorithms. Could this be the dawn of a new era for Suunto Dive computers?

Adrian Stacey
Adrian Stacey
Scuba Diver ANZ Editor, Adrian Stacey, first learned to dive on the Great Barrier Reef over 24 years ago. Since then he has worked as a dive instructor and underwater photographer in various locations around the world including, Egypt, Costa Rica, Indonesia, Thailand, Mexico and Saba. He has now settled in Australia, back to where his love of diving first began.
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