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Oceanic Atom 2 - Elegance In Office And Multitasking Underwater

Oceanic Atom 2 - Elegance In Office And Multitasking Underwater

Oceanic Atom 2 - hoseless air-integrated computer that may be worn as a wrist digital watch as well. Designed to handle 3 Nitrox gas mixes and supports up to 3 transmitters. Multitasking dive computer with 4 dive modes in one small package.

General Information
User Interface
Your Review



Oceanic Atom 2 is made as a dive watch computer and can completely satisfy demands not only the serious beginners in diving by allowing the person to grow in diving career, but also can be recommended dive computer for technical divers who will appreciate variety of features that are distinctive in dive instruments, which cover wide range of applications from diving with air to freediving activities.

Air-integrated dive computers have an inestimable advantage over computers without air-integration – it is a number warnings and alarms relative to Air Time Remaining and Tank Pressure. Constant monitoring of those parameters and displaying their current values makes your each diving safer!


Oceanic Atom 2.0 Features Card

Copy this Oceanic Atom 2 Features & Alarms Card for your Reference and Share with your friends and buddies!



Benefits of using Oceanic Atom 2 dive computer

  • you will have a dive computer that performs perfectly as a standalone digital watch or dive computer with nice price-features ratio;
  • you may set up to 3 Nitrox mixes and try technical diving;
  • you will be able to freedive, as Oceanic Atom 2 has all functions to support this water activity;
  • you will definitely feel great about yourself after finishing user manuals and mastering your Oceanic Atom 2!
  • if you need to change a battery - DIY with "hot swap"!








User Interface
4 buttons
Dive Modes
Air, Nitrox, Gauge, FREEdive
Standalone Digital Watch
modified Haldanean
Number of Gas Mixes
Mix 1- Air, 21% - 50%; Mix 2 & 3 - Air, 21% - 100%
1.2 - 1.6 ATA
Air Integration
Safety Stop (SS)
Deep Stop (DS)
Conservative Factor
Altitude adjustment
Gas Switching
Dive Planner
9 - 57 meters
Logbook Capacity
24 most recent dives
Max Operational Depth
100 meters
Backlight duration
0/5/10 sec
Sampling Rate
2/15/30/60 sec
User Replaceable Battery
Battery 'hot swap'
PC Interface
2 years










Oceanic Atom 2 has 4 control buttons and as it is a high-tech dive instrument, to retrieve information and program it, you need to spend time to learn all of the combinations of those buttons and for how long you will need to press them to get info or adjust the setting you want, not to get frustrated later, especially underwater!

This dive computer has 1 shared bar graph, either for nitrogen tissue loading or oxygen accumulation. Tissue Loading Bar Graph (TLBG) is a default graph, and you may access O2BG (oxygen bar graph) on the alternative display during diving with Nitrox.







During this stage we will set up Oceanic Atom 2. And we will start from its digital watch functions:

  1. main time and alternative time;
  2. full functional calendar;
  3. daily alarm;
  4. countdown timer;
  5. chronograph


Atom 2 has all parameters divided into certain groups, as many other dive computers, and those parameters are FO2, Alarms, and Utilities groups.


Oceanic Atom 2 Settings Card

Copy this Oceanic Atom 2 Settings Card for your Reference and Share with your friends and buddies!







Oceanic Atom 2: Diving With Air & Nitrox

During diving, whether in Normal Mode (air/nitrox), Gauge, or Freedive, you will get different displays with information according to each mode and for every diving condition.


Oceanic Atom 2 NO-DECO Card

Copy this Oceanic Atom 2 NO-DECO Card for your Reference and Share with your friends and buddies!


If you are new to the world of dive computers - here is a bit of theory about Dive Time Remaining – what it shows and how it works.

This Oceanic dive computer shows your Dive Time Remaining (DTR) according to No-Decompression Time, O2 accumulation, or Air Time Remaining (ATR), whichever Time is the least amount available.


No-Decompression Time is the maximum time that you are allowed to stay at certain depth before entering into Decompression mode. This mathematical model is based upon absorption of the nitrogen by the tissue compartments and constantly compared with allowable level of nitrogen accumulation for that depth. The value is displayed as No-decompression (NDC) Time Remaining in minutes and graphically on the bar from the top left side of the screen.

Oxygen accumulation Time Remaining (OTR) is shown when Atom is set for Nitrox. It shares the same bar graph as in case of nitrogen absorption and displayed in minutes and graphically.

Air Time Remaining (ATR) is shown according to the current depth and your air consumption. It assures that you have enough air in the cylinder(s) to surface safely and is displayed in minutes and takes to the account the Tank Pressure Reserve when you set values of the End Pressure alarm.


During ascent Oceanic Atom 2 may give you an Ascent warning/alarm (audio and message ‘SLOW’) if your ascent rates is higher than allowable at certain depth.

Upon reaching certain depth dive computer may give you Safety Stop prompt with all attributes, which you set at pre-dive stage - Safety Stop depth and time.


Below is a small representation of what you will get on main and alternative displays, if Oceanic Atom 2 was set for Nitrox and you have a Decompression mode:

  • TLBG;
  • Deco Stop message;
  • Decompression Stop depth and time;
  • Total Ascent Time (time to surface);
  • Tank pressure;
  • current depth;
  • applicable icons;
  • Elapsed dive time (EDT);
  • Air time remaining (ATR);
  • O2BG;
  • PO2 level;
  • max depth;
  • temperature;
  • time


During Normal dives (Air or Nitrox) Oceanic Atom 2 lets you access to Switch gases and Buddy Pressure check functions, if you enabled more than one gas mix.


Oceanic Atom 2: Diving In GAUGE Mode

When you set Oceanic Atom 2 in Gauge mode - it would work as a depth gauge and timer only and wouldn’t perform calculations for nitrogen loading and oxygen toxicity levels. It is worth to mention that during this operation following functions like Switching gases and Buddy Pressure Check are not available. Atom 2 works only with Transmitter 1 in Gauge mode.

Display in Gauge mode consists of main and alternative and below are the values you will get while diving in Gauge mode:

  • current depth;
  • max depth;
  • tank pressure;
  • Elapsed Dive Time (EDT);
  • Air Time Remaining (ATR);
  • applicable icons and graphics


Oceanic Atom 2: FREEdiving

When Oceanic Atom 2 set for FREEdive mode it will operate as a depth gauge and performs nitrogen loading calculation based upon default settings of FO2 of Air and the amount of nitrogen you’ve got from the previous dives whether in Air or Nitrox modes.

Freedive mode has its specific and certain adjustable parameters, like:

  • countdown timer (CDT);
  • Elapsed Dive Time (EDT) alarm;
  • Free Dive Depth alarms (FDA) – you may set 3 depth alarms at the consecutive deeper depths


Displays (main and alternative) show you the following values:

  • graphic FREE;
  • TLBG (if you have any nitrogen remaining from previous dives);
  • Elapsed Dive Time;
  • current depth;
  • temperature;
  • time


You may access Countdown Timer (CDT) status display and during freedive have all appropriate alarms that you set up before.

And besides that you may have TLBG alarm, and at the certain conditions you may even enter into the Decompression mode. This happens if nitrogen level increases to the Warning level, which means that all 5 segments on the bar graph of Oceanic Atom 2 are filled up and flashing.

This is considered to be a Permanent Violation, you must ascend and do not dive for the next 24 hours.

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After we got out of water and transition period finished, we may access following functions:

  1. Plan mode – plan and view your next dives according to the nitrogen loading or oxygen accumulation from your previous dives;
  2. No-Fly countdown timer;
  3. Time to Desaturate countdown timer;
  4. Log mode with 24 recent dives (only air/nitrox/gauge; freedives not recorded to Log mode, they are stored in the memory and you may download them to your PC);
  5. History mode – contains accumulative information of you diving activities - total number of dives and dive hours, and maximum depth achieved (freedives not recorded to History mode, they are stored in the memory and you may download them to your PC);
  6. PC upload and download function lets us connect Oceanic Atom 2 to PC


Dive Planner is a very usefull function for planning repetitive dives. It shows you No-Decompression times and allowable depths according to nitrogen and oxygen accumulation from previous dive. Range is 9 - 57 meters in 3 meters increments.

Logbook is quite extensive and contain 2 pages of dive data for each dive.

Battery removal doesn’t affect either Logbook data or History data.







Oceanic Atom 2: What Divers Say


  • excellent performance - if you are not going to dive with Trimix, then you have everything in Oceanic Atom 2;
  • hoseless air-integration;
  • additional alarms, like Turn Pressure and End Pressure alarms, to ensure safer diving;
  • powerful dive computer in a watch size package;
  • best value for money



  • audible alarm is not loud enough;
  • may have glitches with the internal firmware;
  • manual is a nightmare, but once you go through the pain once, it's all good after that;
  • with smaller sampling rate can save much less than 24 dives in on-unit memory


Well, guys, we have read all Pros and Cons. Sometimes you may see that performance is different from unit to unit.

From the guys from local scuba dive shop I found out that people who bought Oceanic Atom 2 were quite happy with the performance of this particular dive equipment, and not many returns at all were logged into the system.

So, Oceanic Atom 2 is recommended dive computer for advanced recreational and technical divers who have had already experience of using these devices, because it is high-tech instrument and requires quite a bit of knowledge and patience, especially with hard-to-follow manuals since the very beginning!


Oceanic Atom 2 dive computerOceanic Atom 2
Dive-Computer-Wizard Rating
golden star golden star golden star golden star silver star


But even if you are the beginner and you have desire and you are persistent person – there is all possible for you – learn how to use this dive computer properly and you will have reliable underwater friend for many years to come. Oceanic Atom 2 will definitely allow you to grow as a diver!



Add comment
FinnJ, 1 August 2013 20:16
Great Dive Computer With Complicated User Manual

I'm totally agree with previous buddy, who wrote about hard to follow user manual! I got myself into the same story! That time I wished I could take it underwater and did few trials reading it, pushing buttons and reading display at the same time there!

I think complicated dive computers like this one MUST have integrated Dive Simulator! Overall

I'm very happy with my Oceanic Atom 2! It works great as a wrist watch for everyday wear at my vacations, and as a dive computer. And it has "buddy pressure check" function, which is very convenient option as I may continuously check a tank pressure of my wife!

Ken, 5 October 2011 03:26
Great Dive Watch Computer After I Won Decisively 36-round Fight With User Manual

I may say that Atom 2.0 is a priceless piece of dive gear after I finally figure out how to use it by endlessly learning manual, that seemed to be a nightmare at the beginning. My mates, who were more experienced than me, probably get many grey hair while helping me!

At the happy end and many trials we (Atom and me) got used to each other and I logged more than 350 dives already.


This dive computer is designed for tech diving and has all possible functions available at the size of a bit bigger than wrist watch.

Wireless is perfect, digits on display are easy readable, thanks to good contrast and strong backlight. Audio alarms are quiet and if I wear hood - I can barely hear them.

Also Buddy Pressure Check is good addition - I regularly check my Mrs tank pressure during diving - works well.

PC software is outdated and sometimes I may find difficulties in downloading my profiles to PC.


Overall, I am happy with my choice, and if you decide to go for Oceanic Atom 2.0 - prepare yourself to study user manual rigorously and train your patience - you will need it both - with user docs and PC software!

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