Dive Computer Expert Reviews
Saving Your Precious Time And Finding The Best Dive Computer For You

Dive computer reviews are perfectly organized and consist of fully researched information and ratings of Aeris, Cressi, Mares, Oceanic, Sherwood, Suunto, Tusa, and UWATEC/ScubaPro brands.  In Catalogue Section you may compare any models side-by-side and select dive computer according to your needs! Join thousands of happy customers!


Oceanic GEO - Excellent Choice For Both Beginners And Advanced Divers

Oceanic GEO - Excellent Choice For Both Beginners And Advanced Divers

Oceanic Geo is made as a multitasking computer that can handle Air, Nitrox, Freediving and Gauge modes. Friendly user interface with convenient 'Step Back' feature, 1 Nitrox mix, and user replaceable battery. Can be worn as a standalone digital watch.

General Information
User Interface
Your Review



Oceanic Geo was introduced to the scubadiving world quite a few years ago and it was made to satisfy the requirements not only beginners in diving, but also may be recommended dive computer for advanced recreational divers, and guys from freediving community.

Geo makes good impression by its slick design and variety of features in one small package! It is made as a dive watch computer style with all attributes of digital watch.

And even though it is not an air-integrated and multi-gas dive computer, and we have newer models of this type nowadays – Oceanic Geo still stands out of the crowd of its fellows and will be doing so for many years to come!


Oceanic GEO Features Card

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


If we compare Oceanic Geo and Geo 2.0 dive computers we may notice 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 dive computer

  • you will have device that works equally perfect underwater as a dive computer and at the office as a digital watch;
  • easy and intuitive setup will allow you to master Oceanic Geo quickly and use it effectively;
  • you may get interested diving not only with Air and Nitrox, but also in Gauge mode with technical mixes or freediving - Oceanic Geo has all necessary functions for that;
  • you will be able to replace battery yourself and with battery "hot swap" you keep all settings safe








User Interface
4 buttons
Dive Modes
Air, Nitrox, Gauge, FREEdive
Standalone Digital Watch
modified Haldanean
Number of Gas Mixes
Air, 21% - 50%
1.2 - 1.6 ATA
Safety Stop (SS)
Conservative Factor
Altitude adjustment
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










As was mentioned above this dive computer has 4 buttons on the user's interface: Mode, Select, Light, and Advance.

I couldn’t say that buttons are very small, but sometimes you may find it difficult to press if you wear 5 mm thick gloves – I needed to bend my wrist a bit down to make it easier.

Oceanic Geo has 1 bar graph and it is shared either to display nitrogen loading or oxygen accumulation:

  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 condition, if all 5 segments filled up – you are in Decompression situation;
  2. Oxygen Accumulation Bar Graph (O2BG) – this bar represents oxygen accumulation during single dive or accumulated oxygen during last 24 hours and it may be accessed temporarily on the Alternative display.







Before jumping into water you need to set and customize your Oceanic Geo, and first thing you will surely do – setting up parameters for digital watch functions, like:

  • main time and date;
  • alternate time;
  • daily alarm;
  • countdown timer;
  • chronograph


All customizable parameters 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.

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

  • FO2 – Air, 21% - 50%;
  • 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;
  • Safety Stop Depth and Time;
  • Backlight duration – 0/5/10 seconds, etc.







Oceanic GEO: Diving With Air & Nitrox

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

  1. Normal Mode – when you set it for Air or Nitrox;
  2. Gauge Mode – in this mode Geo 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


When you set Wet activation to ON and get into water, wet contacts of Geo get bridged and if it senses depth of 1.5 meters for 5 seconds, it activates the No-Decompression dive mode.

Depending of what dive option you set – air or nitrox, you will be presented with main and alternative displays with all related information on them, considering your no-decompression and decompression conditions, safety stop and any violations that you may do during the dive.


Oceanic GEO NO-DECO Card

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


During No-Decompression dive, Geo may give you Safety Stop prompt upon reaching certain conditions. Besides to all values displayed at No-Deco dive, it will show you required depth for Safety Stop and Countdown Timer. If Safety Stop option was set to OFF – Safety Stop automatic prompt will not appear.

Oceanic Geo will activate Decompression mode if you exceed No-Decompression Limits (NDL) – No-Decompression time and depth. During this mode you will need to ascend to certain depth, displayed on the screen, and stay at this depth required time that is shown on display in order to decompress.

Decompression Mode is presented by main, secondary, and two alternative displays to keep you well-informed about current situation. Below is a summary of the information shown up on these displays:

  1. TLBG with all 5 segments filled up;
  2. Required Deco stop and Deco time;
  3. current depth;
  4. Total Ascent Time (TAT);
  5. Elapsed Dive Time;
  6. O2BG (if FO2 set for nitrox);
  7. FO2 and PO2 (if Geo set for nitrox);
  8. temperature;
  9. time;
  10. applicable icons


You will easy swap between displays by pressing Advance button.

Also, if you make any violations – Geo will show information related to each kind of violation with appropriate values, Bar Graphs, icons, and graphics.


Oceanic GEO: Diving In GAUGE Mode

If Oceanic Geo set for Gauge Mode – it will work as a depth gauge and timer and do not perform calculations for nitrogen and oxygen accumulation.

When you perform a dive in Gauge mode – Geo stays locked for 24 hours, and you need to wait 24 hours before you may set Geo for Air, Nitrox, or Freedive modes.

Below is a representation from main, alternative, and secondary displays of what you will see during Gauge mode:

  • graphic GAUG;
  • current depth;
  • Elapsed Dive Time (EDT)
  • max depth;
  • temperature;
  • time


You can swap between displays by pressing Advance button.


Oceanic GEO: FREEdiving

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

Again, you will have an access to few displays with all information related to freediving. Below is the summary from main and secondary displays:

  • TLBG, if you have residual level of nitrogen from previous dives;
  • current depth;
  • No-Decompression (NDC) Time Remaining;
  • Elapsed Dive Time (EDT);
  • Countdown Timer status display;
  • applicable graphics


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


Back to Top







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;
  2. Time to Fly Countdown Timer;
  3. Desaturation Countdown Timer;
  4. Log Book Mode – it stores data of your 24 most recent dives (battery removal does not make any effect 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 (battery removal does not make any effect on History memory);
  6. PC interface – this function allows you to download data from Oceanic Geo to PC by using special cable and software







Oceanic GEO: What Divers Say


  • diver replaceable battery;
  • Safety Stop Time and Depth setting;
  • intuitive and easy to read display



  • documentation is not easy to follow;
  • dive computer is a bit bulky to use it as a wrist watch onshore


Oceanic Geo may be recommended dive computer for entry level with range of options that satisfy you on the way to getting advanced certification in diving and will cover variety of diving activities from diving with Air to Freediving. Or maybe you will want just to have a reliable dive computer for the backup – Geo is perfect for this as well.

Anyway, which activity you will choose – you won’t go wrong if you have Oceanic Geo!


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


The last word - if you are the beginner, or advanced, if you freediver, or want to have a backup computer - Oceanic Geo is for you! And look at the price - for dive computer packed with features we discussed above - it's a real godsend!



Add comment
Tyler, 18 June 2013 09:19
Oceanic GEO - Very Functional & Informative

I logged 375 dives on my Oceanic GEO and since I got it first - I didn't find any negatives or complaints! It has all features that recreational diver may need. I can choose from 4 dive modes, adjust Safety Stop and Safety Factor, easy replace battery. Display is bright and easy to read, all abbreviations are easy to understand.

I recommend Oceanic GEO dive computer to every recreational diver and beginner who wants to have multifunctional and straightforward dive computer and save money for other dive gear!

Curt, 5 April 2013 14:15
Oceanic GEO - Easy To Use When Learn All Docs

Oceanic GEO wrist dive computer is a reliable thing that is easy to read and works well in warm or cold water conditions. I prefer a wrist-style dive computer that sits next to my wrist compass.

As GEO can work as a digital wrist watch - I especially like function of setting the main time and alternate time, which is great when traveling from one time zone to another. All digital watch functions are very easy to set, like daily alarm and other stuff related. The battery is easy to change.

The only downside of using this dive computer is that it can be complicated to navigate through from the very beginning, before getting familiar with it. At this moment I have owner's manual with me on dive trips, and I refer to it very often at this moment.

Add comment