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Oceanic GEO 2 - Taking A Learning Curve With Advanced Dive Computer

Oceanic GEO 2 - Taking A Learning Curve With Advanced Dive Computer

Oceanic Geo 2 is upgrade to Oceanic Geo and it was made with refined design, Dual Algorithm, Dual gas mix, Switch gas options and several other improvements, which made this computer really unique among dive computers of the similar class.

General Information
User Interface
Your Review



Oceanic Geo 2 is a further development of well-known dive computer Geo. After 3 years from launching Geo, Oceanic came up with the upgrade to this dive computer. New dive equipment was named Geo 2 and came out with refined design, Dual Algorithm, Dual gas mix, Switch gas options and several other improvements, which made this scuba dive computer really unique among dive computers of the similar class.

If we classify all dive computers as an entry, advanced, and high-tech dive equipment, we my place Oceanic Geo 2 very close to high-tech line and it doesn’t need to be hoseless air-integrated in order to be perfect – because it already is!


This computer may be successfully used and satisfy needs of the beginners, can be recommended dive computer for technical divers, and freedivers too. Even though it has manuals that is hard from the beginning to figure out all buttons combos and what to expect, but after couple of times running through it and playing with Geo 2 at the same time – there will not be any difficulty whatsoever!


Oceanic GEO 2 Features Card

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


After comparing Geo 2 and Geo dive computers, we may see major updates, which Oceanic made to its new dive computer that do not exist in Geo. They include:

  • Dual Algorithm: Pelagic DSAT and Pelagic Z+;
  • Change in user interface: 'Step Backward' and 'Scroll Forward' functions;
  • Geo 2.0 became a dual gas mix dive computer: Gas 1 FO2 – Air, 21% - 100%; Gas 2 - FO2 – Air, 21% - 100%;
  • Gas switch function, of course;
  • Deep Stop prompt ON/OFF;
  • VARI bar graph, but no O2BG – O2 accumulation is represented by percentage;
  • Increased Max Depth in Gauge mode to 120 meters (400 ft);
  • Possibility of Firmware upgrade;
  • Data retention – all nitrogen and oxygen calculations are retained in memory during battery removal



Benefits of using Oceanic GEO 2 dive computer

  • you will be diving with instrument that belongs to advanced dive computers and supports variety of diving scenarios;
  • you will be able to customize Oceanic GEO 2 in many ways to satisfy your certain needs;
  • you may set dive computer for 2nd Nitrox mix and select the appropriate algorithm for liberal or conservative diving;
  • you will be able to replace its battery by yourself when needed and keep settings safe, as Oceanic GEO 2 has data retention function;
  • you will get advanced dive computer and standalone wrist-watch in one package with very reasonable cost








User Interface
4 buttons
Dive Modes
Air, Nitrox, Gauge, FREEdive
Standalone Digital Watch
Dual: Pelagic DSAT & Z+
Number of Gas Mixes
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
Air/Nitrox - 100 m; Gauge - 120 meters
Backlight duration
0/5/10 sec
Sampling Rate
2/15/30/60 sec
User Replaceable Battery
Data Retention
PC Interface
2 years










As was mentioned above Oceanic Geo 2 has 4 buttons on the Interactive Control panel: Mode, Select, Light, and Advance.

Oceanic GEO 2.0 dive computer
Oceanic GEO 2.0 dive computer


Geo 2 has two bar graphs to display nitrogen loading and ascent rate:

  1. Nitrogen loading bar Graph (TLBG) – shows you no-decompression and decompression status: when you go deeper and dive time increases, segments will be added to TLBG, and when you ascend – amount of segments decreases therefore giving you more time to stay underwater; 4 segments represent No-Decompression status, and when all 5 segments filled up – it indicates that you are in Decompression situation;
  2. Variable Ascent Indicator Bar Graph (VARI) – represents your ascent rate at certain depths

Oceanic Geo 2 has Dual Algorithm feature – it means that you may choose between more liberal and conservative diving. And you may add even higher conservative factor by setting Tissue Loading Bar Graph (TLBG) alarm and Personal Conservative Factor. Algorithms are listed below:

  1. Pelagic DSAT – use it for more liberal diving, and to add more conservatism you may adjust Nitrogen Tissue Loading Bar Graph alarm and set your Personal Conservative Factor;
  2. Pelagic Z+ - use it for conservative diving, and by choosing this algorithm, you will increase conservative factor by 15 – 20% right away - this option is a great benefit for those people who involved in frequent and challenging diving conditions, divers who are overweight, and people who dive in cold water conditions or those who didn’t dive for a long period of time







Before diving you need to set desirable parameters before going underwater, of course. As this dive computer made with digital watch functions, so the first parameters you will probably want to set – is your digital watch parameters. It is really easy, just follow the instructions - when and for how long press certain button! Digital watch parameters listed below:

  • main time;
  • dual (alternative) time – maybe time zone of your next travel destination;
  • daily alarm;
  • countdown timer;
  • chronograph
  • date


All parameters in Oceanic Geo 2 are divided into certain Groups where you may set FO2, variety of alarms for Normal and Gauge Modes (for freediving you will set alarms separately and they are accessible from Freedive Mode menu), and number of utilities. Here you will really need to practice with the manuals to get familiar with buttons combinations, because it may be confusing since the beginning!

Below is a summary of what you may set for Normal (Air/Nitrox) and Gauge Modes:

  • Dual gas mix: Gas 1 FO2 – Air, 21% - 100%; Gas 2 FO2 – Air, 21% - 100%;
  • Depth alarm;
  • Elapsed Dive Time (EDT) alarm;
  • Tissue Loading Bar Graph (TLBG) alarm;
  • Dive Time Remaining (DTR) alarm;
  • PO2 alarm – 1.2 ATA – 1.6 ATA in 0.1 ATA increments;
  • Units;
  • Personal Conservative Factor – ON/OFF;
  • Deep Stop – ON/OFF;
  • Safety Stop Depth and Time;
  • Algorithm setting;
  • Backlight duration – 0/5/10 seconds, etc.







As a dive computer, Oceanic Geo 2 operates in 3 dive modes:

  1. Normal Mode – when you set it for Air or Nitrox;
  2. Gauge Mode – in this mode Geo 2 functions as a depth gauge and timer only and doesn’t perform calculations for nitrogen absorption and oxygen accumulation;
  3. Freedive Mode – this mode is for diving without scuba gear


To assist us during diving, Geo 2 dive computer has main and alternative displays with all information related to type of dive, No-Decompression or Decompression conditions, Deep and Safety Stops, and any violations you may have. Also you may switch between gas mixes during the single dive.


Oceanic GEO 2: Diving With Air & Nitrox

Oceanic GEO 2 NO-DECO Card

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


You need to press Advance button with certain duration of time to access alternative displays, Deep Stop and Safety Stop displays. To switch gases you need to use Mode button and for Backlight – Light button.

If you need to switch between gases – it is easy to do – just use combination of Mode and Select buttons. Just remember, that dive begins with Gas 1 and switching is blocked when you are on surface, except during first 10 minutes of the Transition Period when you resurface after the dive.

Decompression mode starts when you exceed theoretical No-Decompression limits of time and depth. If this happens – Oceanic Geo 2 activates an alarm, all 5 segments on TLBG are filled up and flashing and UP Arrow icon will flash too.


Oceanic GEO 2 DECO Card

Copy this Oceanic GEO 2 DECO Card for your Reference and Share with your friends and buddies!


At that time you need to ascend to required Stop Depth that is shown on the display or slightly deeper and stay for decompression for certain Stop Time, which is displayed too.

Also, if you make any violations (ascending shallower than required and stay there for some time) – Oceanic Geo 2 will show information related to each kind of violation with appropriate values, Bar Graphs, icons, and graphics. And, of course, you will not be given any off-gas credits if you ascent shallower, and moreover you will be given penalty minutes and it is your obligation to fulfill you decompression correctly to stay out of Decompression Sickness (DCS).


Oceanic GEO 2: Diving In GAUGE Mode

If Oceanic Geo 2 set for Gauge Mode – it will work as a depth gauge and timer and do not perform calculations for nitrogen and oxygen accumulation, and it will be locked to this mode for 24 hours if dive in Gauge mode was completed.

Below is a representation of information from main and alternative displays, related to Gauge Mode:

  • current depth;
  • max depth;
  • Elapsed Dive Time (EDT);
  • Variable Ascent Indicator (VARI) while ascending;
  • time;
  • temperature;
  • applicable icons


Oceanic GEO 2: FREEdiving

As Oceanic Geo 2 may be used for freediving activities, you need to set some specific parameters for this sort of diving:

  • Countdown Timer (CDT) and toggle it (ON/OFF) while diving;
  • Elapsed Dive Time (EDT) alarm – ON/OFF;
  • 3 Free Depth alarms, each alarm goes for progressively deeper depth


In a Freedive mode Oceanic Geo 2 dive computer works as a depth gauge and nitrogen calculation is based on the default FO2 of Air and the amount that you may have after previous dives from the last 24 hours.

Below is a representation of information from main and alternative displays, which you will certainly have during freedive:

  • current depth;
  • Dive Time Remaining (DTR) with No-Decompression (NDC) icon;
  • Elapsed Dive Time (EDT);
  • Tissue Loading Bar Graph (TLBG), if you still have any remains of nitrogen after previous dives;
  • temperature;
  • time;
  • applicable icons;
  • Remaining Countdown Time, if Countdown Timer is ON


Freediving has its specific displays and set of alarms, like:

  • Countdown Timer display – you may set in ON/OFF;
  • Free dive Elapsed Dive Time (EDT) alarm – different from EDT in Air and Nitrox modes;
  • Free dive Depth (FDA) alarms – you may set 3 depth alarms, each at progressively deeper depths;
  • High Nitrogen Level warning/alarm – if you have nitrogen accumulated from previous dives and it increases to Caution Level (4 segments) during freediving – you will have audio alarm that goes on and 4 segments are flashing on TLBG; when level increases to Deco level and all 5 segments are filled up – you will have audio again with VIO message and UP Arrow will flash, and No-Decompression Time will be 'zero'


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After the Transition Period you will have access to following modes:

  1. Pre Dive Planning Sequence (PDPS) – this function allows you to see for how long you may stay underwater safely and at what depth, according to your current nitrogen or oxygen accumulation and Algorithm selected;
  2. Time to Fly Countdown Timer;
  3. Time to Desaturation Countdown Timer;
  4. Logbook Mode – it stores data of your 24 most recent dives (battery removal does not make any affect on Logbook memory);
  5. History Mode – accumulates information, like number of dives, number of dive hours, and Max depth achieved from all your previous dives, lowest temperature recorded, etc. (battery removal does not make any affect on History memory);
  6. PC interface – this function allows you to upload and download data from Oceanic Geo 2.0 to PC by using special cable and software







Oceanic GEO 2: What Divers Say


  • easily use and grow into after you learn the manual;
  • step backward and scroll forward options in user's interface;
  • offers a lot of information;
  • easy to switch between gas mixes;
  • good and comfortable as a wrist watch



  • hard to operate dive computer;
  • manual may be difficult to understand at first


As you may see, Oceanic Geo 2 may be recommended dive computer for the beginners, technical and free divers. It offers great range of features, like Dual Algorithm, Dual Gas; Gas switching, improved and user friendly interface – these features may easily satisfy the most demanding divers, and it’s all in one small package of the size of wrist watch – and that is the main benefit for us!

And it looks just "cool" on you wrist, as you may wear it as a watch – I got few nice compliments of people from the office about it!


Even though you may find difficult following manuals; pressing buttons while diving in cold water and wearing thick gloves; or difficulties of seeing digits at the sharp angles – these cases do not depreciate great features and benefits that this dive computer may give you during all term of its exploitation.

Another main thing about this dive equipment – it is the price!


Oceanic Geo 2 dive computerOceanic Geo 2
Dive-Computer-Wizard Rating
golden star golden star golden star golden star half star


If you want to have reliable, friendly and flexible dive computer that will cover wide range of your diving activities and allow you to grow as a diver without needing to buy additional dive instruments and pay for the pack so low price at the same time - Oceanic Geo 2 is for you!



Add comment
Luke, 18 August 2013 09:51
Very Comprehensive Dive Computer With Very Reasonable Price

I think that Oceanic GEO 2 is one of the best dive computers that we have in our market these days. I even recommend it to some of my students as a good starting point into their diving career, regardless that people may spend quite sometime with user documentation! Because this computer has good balance of complexity and involvement of the person. If someone may figure out how to operate Oceanic GEO 2 - it will be easier for this person to comprehend more difficult dive computers sometimes in a future.

I love its Dual Algorithm and double gas mix function - they were made for almost every dive situation! It has Safety and Deep stops adjustable and moreover I could turn ON/OFF Conservative factor. This function allows me diving in liberal and more conservative profiles. Setup menu system set in very logical order - if follow manual, there shouldn't be too difficult to set it up to desired mode and all corresponding to it functions.

It's good that Oceanic GEO 2 has specific alarms for freediving - no need to buy separate dive computer if you want to become a freediver! Oceanic GEO 2 may be recommended dive computer for serious beginners and recreational divers with experience who want to have multifunctional dive computer and standalone digital wrist watch in one pack!

Darcy, 8 March 2013 16:15
Oceanic GEO 2 - Highly Recommended Dive Computer

Excellent double nitrox dive computer. Easy to set up, easy to use and read. Multifunctional from every side.

I really like having a wrist mounted instead of a computer on a hose. It is so much easier to check where I'm at current moment!

I love an idea having integrated digital watch in dive computer, it has each function of normal wrist watch with great dual time - easy to set alternate time zone of travel destination. Easy to replace battery - no need to send Oceanic GEO 2 to the dealer - saving time and money!

With Dual Algorithm feature I can dive liberal and conservative, easy to adjust to my buddy's profile.

I'm very happy with this dive computer so far and I highly recommend it to every diver who doesn't need air integration.

Dewolfe, 11 March 2011 07:51
Free Dive Issue

Impossible to set mode of watch to free dive with manuals, video, google...

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