Dive Computer Expert Reviews
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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!


Suunto Cobra - Be Sharp Aware Of Your Air Consumption

Suunto Cobra - Be Sharp Aware Of Your Air Consumption

Suunto Cobra - hose air-integrated computer and it is suitable for beginners and advanced divers as primary or backup computer. Easy to learn and easy to use. Altitude and Personal Conservative Factor adjustment.

General Information
User Interface
Your Review



Suunto Cobra is a hose air-integrated dive computer with optional Quick Disconnect feature and optional PC interface data cable. Cobra perfectly suits for the beginners in diving, and can be recommended dive computer even for backup, and for advanced recreational divers.

Suunto Cobra has only one mounting option - console. And you could easily fit a Suunto compass to it to make a nice addition and to make it more versatile.

If you decide to buy this Suunto computer – definitely grab the Quick Disconnect (QD) feature! It will greatly improve safe storage and service of this scuba diving equipment!

Suunto Cobra Features Card

Copy this Suunto Cobra Features & Alarms Card for your Reference and Share with your friends and buddies!

This dive computer may be successfuly used in variety of diving situations, thanks to its 3 dive modes capabilities. You may definitely use it as a main instrument, but if you prefer opposite - it will work great as a backup as well!

As all Suunto dive computers, this one has Continuous Decompression function.



Benefits of using Suunto Cobra dive computer

  • you will get perfect instrument for either backup or main dive computer for recreational diving;
  • you will be sharp aware of your air consumption at any moment;
  • you will have instrument that is user friendly, very adjustable and middle of the road conservative;
  • you will be able to build NAVCON by adding a compass;
  • you will have dive computer with quite large viewable display area and perfect display layout;
  • you will have dive computer with excellent DECO management;
  • you will be able to customize Suunto Cobra dive computer to suit your particular needs;
  • you will be able replace battery yourself very easy








User Interface
3 buttons
Dive Modes
Air, Nitrox, Gauge
Integrated Digital Compass
Suunto – RGBM
Number of Gas Mixes
Air, 21% - 50%
1.2 - 1.6 ATA
Air Integration
Safety Stop (SS)
Recommended and Mandatory Safety stops
Deep Stop (DS)
Conservative Factor
Altitude adjustment
A0/A1/A2 (range from 0 to 3000 meters)
Gas Switching
Dive Planner
9 - 45 meters
Logbook Capacity
36 hrs with 20 sec profile sampling
Max Operational Depth
80 meters
Backlight duration
ON/OFF/5 - 30 sec
Sampling Rate
10/20/30/60 sec
User Replaceable Battery
Data Retention
PC Interface
2 years










Suunto Cobra dive computer has 3 buttons on the user interface panel: Smart, Time, and Plan. Using them you can set your dive computer, change modes, and view alternative displays, etc. After spending some time and learning how to do it – you will become very professional!

Cobra has 2 bar graphs that are shared between functions and show information according to mode you are in certain situation.

Left side bar graph is shared between Mode Indication, Consumed Bottom Time (similar meaning to Nitrogen Tissue Loading Bar Graphs in Aeris and Oceanic dive computers) and Oxygen Limit Fraction displays:

  1. Consumed Bottom Time (CBT) Bar Graph – it is graphical representation of No-Decompression Time that you have. As you stay longer and go deeper – your body absorbs nitrogen more and this bar graph adds new segment each time your No-Decompression time decreases. It has 3 coloured zones – green, yellow, and red. As these colours tell you – green zone – you are far away from Decompression zone, yellow zone – it is time for you to start ascending (still No-Decompression), and red zone – Decompression.
  2. Oxygen Limit Fraction (OLF) Bar Graph – represents oxygen toxicity when diving with Nitrox.

Right side bar graph is shared between Ascent Rate, Battery Status, and Logbook Page Numbering:

  1. Ascent Rate Bar Graph – it is your ascent speedometer, if you ascent faster than allowed – speedometer will give you all set of segments with message SLOW and alarm.
  2. Battery Status Bar Graph – all 4 segments mean that battery is OK, and less number of them means that battery needs your attention.
  3. Logbook Page Numbering – when you view your logs this indicator shows you page number of Cobra’s logbook by displaying certain segments.







Suunto Cobra dive computer has few user adjustable functions and alarms. And we are going to set them up right now.

They are all accessible from Mode Menu and its sub-modes:

  1. Set Preferences;
  2. Set Dive;
  3. Set Time


When you set Cobra – it is easy to follow, because display has graphical and notation tips – you won’t miss out anything!

Suunto Cobra has very nice feature – On-Unit Dive Simulator. This thing is a great help for you to get familiar with dive computer! You may have a ‘virtual’ dive and watch how Cobra works in different dive scenarios and how your dive profile will look like with all displays, warnings and alarms.

So, before diving it is good thing just to play for a while with this dive computer to feel it and get to know each other!


During set up we will customize following functions:

  1. Altitude Program setting: A0(0 – 300 meters)/A1(300 – 1500 meters)/A2(1500 – 3000 meters);
  2. Personal Conservative Factor setting: P0/P1/P2 – to make this dive computer progressively more conservative;
  3. Dive Time alarm – range 1 – 999 minutes;
  4. Max Depth alarm – range 3 – 100 meters (factory preset for 40 meters);
  5. FO2 – 21% - 50%;
  6. PO2 – 1.2 – 1.6 bar;
  7. Time Mode settings: time, date, alarm;
  8. backlight duration: ON/OFF and user adjustable from 5 – 30 seconds;
  9. units;
  10. Dive Mode: Air, Nitrox, Gauge







Suunto Cobra is very easy and straightforward to use dive computer and you should be very confident in quality of job Cobra does for you!

Suunto Cobra: Diving With Air & Nitrox

We start our first dive with Air and No-Decompression mode and have a look at the display information of what we get.

Suunto Cobra NO-DECO Card

Copy this Suunto Cobra NO-DECO Card for your Reference and Share with your friends and buddies!


Suunto Cobra, likewise other dive computers from Suunto, has Bookmark function. You may store data of your dive profile by pressing Plan button. After that you will be able to download to PC for viewing and examining you dive profile.

Cobra has very useful feature – Low Air Pressure Warning and Alarm, like actually all air-integrated dive computers have.

Dive computer will beep when tank pressure becomes 50 bar. And Cobra will give you an audio again when Air Time Remaining becomes ‘zero’. But even in the case of ‘zero’ Air Time Remaining (ATR) – you still have in tank 35 bar gas pressure. It is made like that to insure that we have some gas reserve to resurface.


Few words about Safety Stops (SS). As it was always said that Safety Stops are good safe diving practice – you probably heard this statement not only once during your training. By stopping you will normalize ascent and reduce microbubbles development in your body. Suunto Cobra has two types of Safety Stops:

  1. Recommended Safety Stop – when you dive deeper than 10 meters – you will get Recommended Safety Stop remainder at range 3 – 6 meters deep;
  2. Mandatory Safety Stop – if your ascent rate exceeds certain allowable maximum


Mandatory Safety Stop and Ascent Rate Bar Graph work together: when my ascent rate was faster – I had an audio alarm, full set of segments in Ascent Rate Bar Graph, and notation ‘Stop’, which meant that I had to perform Mandatory Safety Stop upon ascent.

You may miss Recommended Safety Stop without any penalty, but Mandatory Safety Stop is compulsory. If you miss this one – you will get shorter No-Decompression times during next dive and you need to stay longer on surface before the next dive.


When we set Cobra for Nitrox dive – we must enter exact numbers of FO2 and PO2. After we did that – dive computer would calculate maximum operational depth (MOD) according to FO2 and PO2.

Suunto Cobra allows us to set 1 Nitrox mix with FO2 22% - 50%, but default Air with FO2 21%.

When set for Nitrox, Cobra displays similar information to Air dive, but with few differences, related to only diving with Nitrox:

  • Consumed Bottom Time (CBT) Bar Graph is substituted by Oxygen Limit Fraction (OLF) Bar Graph on the main display and OLF shows us oxygen toxicity level ( CBT Bar Graph is shown on the alternative display);
  • FO2 value may be replaced by Air Time Remaining (ATR) automatically, if ATR becomes less than 30 minutes;
  • High PO2 alarm (if activated);
  • High OLF alarm (if activated)


For more data – we need to press Time button to call up alternative display with following information:

  • current time and temperature;
  • Consumed Bottom Time Bar Graph;
  • max depth;
  • FO2 value if Air Time Remaining is less than 30 minutes (because in such case AirTime Remaining will replace FO2 value on the main display)


If you exceed your No-Decompression Limits (NDLs) – Suunto Cobra will go to Decompression mode. All data that you will get after that is related to this mode. During decompression you will be prompted to complete one or few decompression stops at a range of depths.

Cobra, like other dive computers from Suunto, has Continuous Decompression feature that allows us to perform decompression within the certain range of depths, so called Decompression range. It starts from the ‘floor’ (deepest depth where deco stop time won’t increase) to the ‘ceiling’ (shallowest depth) and decompression is done between them.

Cobra manages decompression perfectly by displaying following data:

  • guiding arrows (for your correct ceiling depth);
  • Ascent Time in minutes (total time to surface, including time to reach the correct ceiling, time to stop at the ceiling, Mandatory Safety Stop (if any), time to surface after ceiling);
  • Ceiling depth;
  • Elapsed Dive Time (EDT);
  • max depth reached during a dive


If you missed correct decompression ceiling and found yourself above it, Suunto Cobra would give you an audio alarm with corresponding icons, your current depth and ceiling depth values, and Error mark. It means that you have only 3 minutes to correct you position and descend to ceiling depth displayed or a bit below.

If you violate the decompression continuously – dive computer will ‘feel hurt’ by you and activate permanent Error Mode and will work as a depth gauge and timer only. You must not dive for at least 48 hours then!


Suunto Cobra: Diving In GAUGE Mode

Third Dive mode of Suunto Cobra dive computer is Gauge mode. If set for Gauge mode – Cobra won’t calculate nitrogen and oxygen loadings and it will work as a depth gauge and timer. Dive main display has following data:

  • current and maximum depth;
  • Elapsed Dive Time (EDT);
  • Air Time Remaining (ATR);
  • tank pressure;
  • Ascent Rate Bar Graph (if ascending)


To swap main and alternative displays – press Time button and you will get current time and temperature in addition.

Back to Top







Ok, we resurfaced now, took out our dive gear and made ourselves comfortable somewhere in shade. This time we are ready to view our logbook, or history, or maybe download dive profile to PC, while having a chat with buddies.

On surface you will have an access to following modes and functions that Suunto Cobra has on offer:

  1. Simulation mode with 2 sub-modes: Dive Simulator and Dive Planning Simulator;
  2. Memory mode with 3 sub-modes: Logbook, History, and PC Data transfer;
  3. Set modes with 3 sub-modes: Set Preferences, Set Dive, Set Time


Here is a brief description for each of these sub-modes.

  1. Dive Simulator, as I mentioned above, is for getting to know your dive computer by having ‘virtual’ dive – you may enter variety of data and watch what display looks like and what kind of alarms you may have during actual dive.
  2. Dive Planning Simulator shows you available No-Decompression times according to your nitrogen and oxygen loading from previous dives – this is a nice feature for planning your repetitive dives.
  3. Logbook has 4 pages of data from your dives and it is very detailed. It may store for up to 36 diving hours in on-unit memory with 20 seconds sampling rate. And, of course, capacity depends on sampling rate, which you may adjust to your own preferences for 10/30/60 seconds.
  4. History is a summary of all your dives. It stores information of 999 dives and 999 diving hours and shows the maximum depth reached, total number of dives, and total accumulated dive hours.
  5. PC Data transfer allows you to interconnect Cobra to PC and download your Logbook data, organize your diving records, view and print logs and diving profiles.
  6. Set Preferences, Set Dive, Set Time sub-modes should be already familiar to us, because we used them to set up initially our Suunto Cobra, and just for remainder – these sub-modes are for setting preferences, parameters for diving with Air and Nitrox, setting alarms and adjusting time







Suunto Cobra: What Divers Say


  • user friendly, very adjustable and middle of the road conservative;
  • very easy to use, big display and gives a lot more time underwater;
  • great price for dive computer and compass console;
  • Deco mode functionality is very good;
  • quick disconnect (QD) feature is very convenient...



  • optional software;
  • PC software may have problems with recognizing dive computer;
  • compass in console is really cheap quality;
  • may have poor USB data cable connection...


Suunto Cobra is rather basic instrument and may be recommended dive computer for either backup or main computer for recreational diving whether you are a beginner or experienced diver.

I may tell from my experience of using it that Cobra was pretty intuitive dive computer – it was easy to figure out how to set up and read information, especially when you use Dive Simulator – you learn faster display layout and what to expect underwater.

Air-integration gives you another level of freedom – Cobra calculates your Air Time Remaining and shows Tank pressure according to your air consumption.

I agree entirely with our reviewers that software and PC interface should be included in the package and another thing – to make a good connection – you should hold PC data cable in dive computer socket in order for PC software to recognize dive computer. It didn’t happen every time though.

And it does happen not only with Suunto Cobra – I’ve seen quite a few dive computers from very well-known brands, which required the same procedure – connect and hold data cable in the socket to make a stable connection!

If this ‘opportunity’ to hold data cable to make a good connection scares you already – maybe you need to buy Mares Nemo Excel or UWATEC Galileo SOL then! These dive computers have infrared port for communication, but interface units are still optional and prices are different, of course.

So, to make a fair conclusion – Suunto Cobra is still very solid and reliable dive computer and as the other dive computers, it has sometimes imperfections. But from the specs, features and price point of view it is very competitive among other hose air-integrated dive computers these days.


Suunto Cobra & Compass Suunto Cobra with Compass
Dive-Computer-Wizard Rating
golden star golden star golden star golden star half star


If you want to have reliable, easy to learn and use hose air-integrated dive computer from respectable brand – Suunto Cobra is definitely for you!



Add comment
Oscar, 11 November 2013 08:38
User-Friendly Interface

Suunto Cobra has convenient and user-friendly interface, that's why I've chosen it at first during my OW certification. It is almost 5 years with me and I won't change it for anything else. As I dive recreational only - Cobra has everything I need to dive safely.

I recommend this dive computer to any recreational diver, whether beginner or experienced.

Jerry, 5 March 2013 11:11
Solid Build NAVCON With Suunto Cobra

I'm using Suunto Cobra NAVCON for more than 3 years and finished my Underwater Navigation Course with it. Don't have any complaints on this design, even some people may disagree with me and say - it's a cheap built thing! Maybe it's not the toppest one from consoles around - but it does its job and I'm more than satisfied with its performance!

Chris, 12 October 2011 07:58
Suunto Cobra Covers All My Needs!

I've been diving with Cobra for number of years and even there are many new dive computers around - I still do not want to replace it with something else! Cobra is perfect example of the scuba dive computer for recreational diving.

I like its full personalization possibilities, like setting altitude and personal factor adjustments, dive simulator, and really invaluable features that come only with air-integrated dive computers - tank pressure and air time remaining indication.

I have Cobra with quick disconnect, so I may take it and store somewhere in safer location, not with all my dive gear in my bag.

Display is intuitive and easy to read underwater, user interface is intuitive too, battery replacement is easy and straightforward.

One grave disadvantage - PC connection cable. It is quite cheap quality made and very often I can't make steady connection with PC. It takes much more time to download a dive data to PC from a single dive than learn user manual!

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