Atom 3.1

Withstands high pressure - making it perfect for the office.

The Atom 3 1 presents your critical dive data including depth, no-deco time remaining, cylinder pressure, air time remaining, and elapsed dive time—all on a clear easy-to-read display Featuring a host of new features including our exclusive Dual AlgorithmTM, the Atom 3 1 is a stylish rugged device that can be worn as a watch topside and can monitor up to 3 optional wireless transmitters and Nitrox mixes underwater

Save 20%

Trade in your current dive computer at an Authorized Dealer and get an instant 20% cash savings towards the purchase of a new Oceanic dive computer. In store physical trade in only. Details.

Free Shipping

Get free ground shipping when you have your Oceanic purchase shipped to your local dive shop! Dealer locator. Available in US only.

Availability: Sold out

Price From: $674.95

* Required Fields

Small but Powerful

Don't be deceived by its easy to read display and intuitive user interface -- this small format powerhouse delivers all the bells and whistles you would expect from Oceanic. Presents your critical dive data including depth, no-deco time remaining, cylinder pressure, air time remaining, and elapsed dive time - all on a clear easy-to-read display. Featuring a host of new features including our exclusive Dual Algorithm™, the Atom 3.1 is a stylish rugged device that can be worn as a watch topside and can monitor up to 3 wireless transmitters and Nitrox mixes underwater.
  • Powered by Oceanic's Exclusive Dual Algorithm® allowing you to choose the decompression algorithm basis that best suits your diving needs without compromising safety
  • Wireless Air Integrated Technology allows streamlined and accurate monitoring of tank pressure
  • 4 Operating Modes: WATCH (Alternate Time (with option to display Main and Alternate simultaneously), Chrono, Daily Alarm, Countdown Timer), NORM (Air and Nitrox), GAUGE (with run timer) and FREE (tracks calculations to allow switching between NORM and Free)
  • Switch between 3 independent transmitters, with up to 3 nitrox mixes to 100% O2
  • Improved user-interface with "Step Back" History - allows forward and backward navigation through menus and settings
  • Safety stop - auto (with adjustable stop time and depth) + manual (run timer)
  • Gauge Mode with Run Timer
  • Single button access to "Last Dive" display (max depth & bottom time)
  • Deep Stop with Countdown Timer
  • Customizable Audible Alarms with flashing red LED light
  • Data Retention - allows between dive battery replacement
  • History Mode includes total number of dives, max depth, total dive hours, and lowest temp
  • OceanLog® PC Download and Settings Upload Software and USB Cable included with "Complete" option only
  • Firmware Update Ready
  • Physical Specs: THICKNESS 5/8", HOUSING 2.1/8", FRONT LENS 1.1/2", SCREEN 1.1/4"
  • Warranty: 2 Years
Dual Algorithm Technology

Dual Algorithm Technology

Choose the one dive computer that’s liberal, conservative or middle-of-the-road.

Dual Algorithm™ technology lets you choose the decompression algorithm that best suits your diving needs without compromising safety.


repetitive deep and decrompression dive profile


Choose Pelagic DSAT for:

Liberal Recreational Diving

The Pelagic DSAT Algorithm safely maximizes dive time for repetitive, multi-level recreational diving. This algorithm relies on the human Doppler studies used to develop PADI’s Recreational Dive Planner (RDP), and has been the basis of our Dive Computers and other manufacturer's computer algorithms for many years. 

To add additional conservatism, you can also adjust the:

  • Tissue-Loading Bar Graph Alarm
  • Conservative Factor Setting


Choose Pelagic Z+ for:

Conservative Recreational Diving

When applied to standard recreational diving, the Pelagic Z+ Algorithm basis increases the conservative factor of the OC1 by 15-20%.

Liberal Repetitive Deep and Decompression Diving

The Pelagic Z+ uses the Buhlmann ZHL-16C database, which was conducted to meet the more rigorous demands of repetitive, cold-water decompression diving at altitude. The Pelagic Z+ mode maximizes dive times at depth without penalties.

Dive in sync with any buddy, anywhere.

Because the Dual Algorithm allows you to adjust the algorithm basis and its conservatism, you can adjust to closely match just about any other dive computer on the market, allowing you and any buddy to always dive in sync. Diving the same profile increases safety for both divers, and eliminates the need for one person to conduct a much longer or deeper stop when buddying with someone wearing a more liberal dive computer. On repetitive dives, there is no more waiting for the more conservative dive computer to clear. Both buddies will be ready to enter the water at the same time and can continue to dive the same profiles. You can’t control which dive computer your buddy wears, but you can control your ability to dive the same profile.

A note about deep stops:

Both algorithms allow (user ON/OFF option) credit for deep stops for No-Decompression dives in keeping with the data of Morroni et al (2004) and Bennett et al (2007).  No penalty is given if the diver skips the deep stop, but it is strongly recommended that a shallow safety stop be made with or without the deep stop in keeping with the experiments of Pilmanis (1975). 

It is important to note that neither algorithm provides deep stops for decompression dives since there is ample experimental data [Blatteau et al (2005), Gerth et al (2007), and Gutvik et al (2007)] that indicate that this practice often produces an increase in the risk of DCS.

For more infomation and detailed "Liberal vs Conservative" algorithm comparison charts - see Scuba Diving Magazine's ScubaLab "Digging Deep on 2009's New Dive Computers".

DSAT published & protected by Diving Science & Technology

Write Your Own Review

You're reviewing: Atom 3.1

How do you rate this product? *

1 star 2 stars 3 stars 4 stars 5 stars

Customer Reviews

Review by Buckaroo (Posted on 1/6/16)
A great unit once you get the hang of the menu. I've had over 150 dives with the transducer and I'm so confident I no longer use an SPG, this coupled with an Air2 as my octo makes my rig supper small and neat letting me drag around even more camera gear.
Review by Gonzo (Posted on 10/24/14)
Great product and works perfectly! A little hard to navigate through it at first because the instructions are slightly confusing. Once you get how it works, it's just perfect!
An awesome pick
Review by Pedro Prochno (Posted on 11/25/13)
I bought a atom 3.0 with a transmiter. I just love the computer. It is simple to use and operate once you learn how everythig is putted together. It gives you nice info and helps a lot durring dive.

Alarms (light and sound) are not good at all. You cant hear or see it blinking. So torn them off and pay attention to the dive.

• Watch
• Dive Computer (Air or Nitrox) with up to 3 Gases up to 100% O2 and 3 Transmitters.
• Digital Depth Gauge/Timer with up to 3 Transmitters.
• Free Dive (breath hold) activity with Depth Gauge/Countdown Timer.

• Buhlmann ZHL-16c based PZ+, or DSAT based, algorithm.
• No Deco limits closely follow PADI RDP.
• Decompression in agreement with Buhlmann ZHL-16c and French MN90.
• No Deco Deep Stops >> Morroni, Bennett.
• Deco Deep Stops (not recommended) >> Blatteau, Gerth, Gutvik.
• Altitude >> Buhlmann, IANTD, RDP (Cross).
• Altitude corrections and O2 limits based on NOAA tables.

• Startup
> Pressure => 120 PSI (8 BAR)
> Battery => 2.75 volts
• Shutdown
> Pressure < 50 PSI (3.5 BAR)
TMT Compatibility with Nitrox
When packaged and shipped from the factory, Oceanic TMTs are rated for use with compressed Air and Nitrox mixtures containing up to 99% O2 by volume and with 100% O2.

Function: Accuracy:
• Depth ±1% of full scale
• Timers 1 second per day
Dive Mode Activation:
• Must be in Dive Computer mode, if Wet Activation is set OFF.
• Automatic by immersion in water, if Wet Activation is set ON.
• Cannot be manually activated deeper than 4 FT (1.2 M), if Wet Activation is set OFF.
• Cannot operate as a DC at elevations higher than 14,000 feet (4,270 meters).
Dive Counter:
• NORM/GAUG displays Dives #1 to 24, FREE displays #1 to 99 (0 if no dive made yet).
• Resets to Dive #1, upon diving (after 24 hours with no dives).
Dive Log Mode:
• Stores 24 most recent NORM/GAUG dives in memory for viewing.
• After 24 dives, adds 25th dive in memory and deletes the older dive.
• Operational from sea level to 14,000 feet (4,270 meters) elevation.
• Measures ambient pressure every 30 minutes in Watch mode, when Dive Computer mode is accessed, and every 15 minutes while in DC Surface modes.
• Does not measure ambient pressure when Wet.
• Compensates for Altitudes above sea level beginning at 3,001 feet (916 meters) elevation and every 1,000 feet (305 meters) higher.
• Watch Battery (1) 3 vdc, CR2430, Lithium battery (Panasonic or equivalent)
• Transmitter Battery (1) 3 vdc, CR2, .75 Ahr, Lithium battery (Duracell model DL-CR2 or equivalent)
• Shelf life Up to 7 years (when shipped from factory in Deep Sleep mode)
• Replacement User replaceable (annual recommended)
• Use Life (ATOM 3.0) 1 year or 300 dive hours if (2) 1 hour dives per dive day
• Use Life (Transmitter) 300 dive hours if (2) 1 hour dives per dive day
Battery Indicator (ATOM 3.0 only):
• Warning >> icon on solid when <= 2.75 volts, Battery change recommended.
• Alarm >> icon on flashing when <= 2.50 volts, change the Battery, will not function as a DC.
Operating Temperature:
• Out of the water >> between 20 °F and 140 °F (-6 and 60 °C).
• In the water >> between 28 °F and 95 °F (-2 and 35 °C).

Do more with your data. Mac? PC? No Problem

DiverLog (mac) and OceanLog (PC) are fully functional dive computer management software solutions designed especially for Oceanic. Easily upload and save data recorded by your dive computer, or input your data manually. The software allows you to easily view, edit and manage dive data and history.

DiverLog for Mac Divers

Features Mac * Mobile * Cloud
Lite Full Free Subscription
Search, edit & manage dive data & photos
Save personal & certification data
Manage favorite locations
View interactive dive profile graphs
Add & register multiple dive comps
Firmware upgrades
Synchronize data Mobile, DiveCloud Mac, DiveCloud Mac, Mobile Mac, Mobile
Dive comp configuration &amp; setup
Social sharing
Storage Unlimited ** Unlimited ** Unlimited ** 10 dives or 50 MB 2 GB
Cost FREE $24.95 $11.99 FREE $9.99 PER YEAR

* Currently available for Mac OSX 10.6 & IOS 5.0 or higher.   ** Limited only by the storage of your device.

To learn more and download the software, please visit

DiverLog-tn1 DiverLog-tn2 DiverLog-tn3

OceanLog for PC Divers

Features PC
Save personal data
Save medical & certification data
View, edit & manage dive data
Create dive graphs & memos for every dive
Add photos to dive logs
Firmware upgrades *
Manage favorite locations
Catalog dive gear
Add dive buddies & contacts
Search dive history
OceanLog Software
OceanLog 2.X (Release Notes)
OceanLog 2.X beta (Release Notes)
Computer Latest Firmware Computer Latest Firmware
OC1 F2B05 (6/11/12) Details VEO 2.0 1D (8/12/10) Details
OCi 1E.03 (12/2/14) Details VEO 1.0 1D (8/12/10) Details
VT 4.1 2B03 (5/29/12) Details Atom 3.1 2A (10/11/11)
Geo 2.0 1I (7/17/14) Details Pro Plus 3 1B (6/18/13)
VEO 3.0 1C (8/12/10) Details Pro Plus 2.1.1 3B (5/24/12)
VTX 1B (12/2/14) Details
Computer Latest Firmware
Atom 1.0 N/A


Windows 98/SE (32 BIT USB Driver) DOWNLOAD
Windows 2000 (32 BIT USB Driver) DOWNLOAD
Windows XP/Vista/7/8 (32 BIT USB Driver) DOWNLOAD
Windows XP/Vista/7/8 (64 BIT USB Driver) DOWNLOAD

OceanLog-tn1 OceanLog-tn2 OceanLog-tn3
30 30-Day Satisfaction Guarantee

We guarantee that at any time during the first 30 days of purchase, your Oceanic product fails to meet your expectations, that product may be exchanged by a participating Authorized Oceanic Pro Dealer. No questions asked.

Related Products