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 Gekko Always Keeps You Well-Informed At Any Condition Of Your Dive

Suunto Gekko Always Keeps You Well-Informed At Any Condition Of Your Dive

Suunto Gekko is basic instrument from Suunto dive computers that is best suitable for beginners or as a backup device. Has everything you will need to dive with Air and Nitrox. Very easy to set up and use. Very customizable dive computer with user replaceable battery option.

General Information
User Interface
Your Review



Suunto Gekko is a good choice as an entry dive computer for the beginners, for rental purposes for dive shops and dive clubs or you may successfully use it as a backup instrument.

If we compare Gekko and Zoop – we will find many similarities in display layouts, users’ interface and operations of these two dive computers.

And mainly differences will be only colour scheme and absence of PC interface support in Suunto Gekko, as this dive computer doesn’t have PC download option.

It is still possible to reset calculations for nitrogen and oxygen intake and reset some other functions to the factory defaults, but it may be done only in dive shops with special piece of software that is not sold for private usage.


Suunto Gekko Features Card

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



Benefits of using Suunto GEKKO dive computer

  • you will learn fast this dive computer thanks to its easy to follow user manuals and friendly interface;
  • you will get very user-friendly dive computer that is perfect for the beginners and recreational divers;
  • you will have dive computer that is very easy to set up and dive with;
  • you will be able easy to read display and interpret numbers very quick;
  • you will be able to replace battery in Suunto GEKKO dive computer by yourself








User Interface
3 buttons
Dive Modes
Air & Nitrox
Suunto RGBM
Number of Gas Mixes
Air, 21% - 50%
1.2 - 1.6 bar
Safety Stop (SS)
Conservative Factor
Altitude adjustment
A0/A1/A2 (range from 0 to 3000 meters)
Dive Planner
9 - 45 meters
Logbook Capacity
50 hrs with 30 sec sampling rate
Max Operational Depth
100 meters
Backlight duration
phosphorescent display
Sampling Rate
factory pre-set
User Replaceable Battery
Data Retention or battery 'hot swap'
PC Interface
2 years










Suunto Gekko dive computer has 3 operation buttons on the user interface: Smart, Plan, and Time. All of them are located on top side of the unit – it is good for an easy access.

You may see that 2 bar graphs that Suunto Gekko has, work similar to Suunto Zoop, Suunto Vyper and Suunto Cobra dive computers. Below I made a brief description each of them.

Suunto Gekko dive computer
Suunto Gekko dive computer


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 (OLF) displays:

  1. Consumed Bottom Time (CBT) Bar Graph – it is graphic 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. According to these colours – green zone is your No-Decompression zone with plenty of No-Decompression time, yellow zone – it is time for you to start ascending (still No-Decompression), and red zone – Decompression dive;
  2. Oxygen Limit Fraction (OLF) Bar Graph – represents oxygen toxicity level when diving with Nitrox;
  3. Mode Indication – shows us certain segments when we are in corresponding mode of operation


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

  1. Ascent Rate Bar Graph – shows how fast you ascend, if your ascent faster than allowed – bar graph will give you all set of segments with message SLOW and audio 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 or replacement;
  3. Logbook Page Numbering – when you view your log pages this indicator shows you corresponding page numbers of the logbook by displaying certain segments one after another from top segment to bottom segment







Setting this dive computer is very easy task and you can do it in no time after getting familiar with Gekko interface and manuals.

Below is a list of customizable functions that can be accessed from Set mode:

  • Altitude Program setting: A0(0 – 300 meters)/A1(300 – 1500 meters)/A2(1500 – 3000 meters);
  • Personal Conservative Factor setting: P0/P1/P2 – to make this dive computer progressively more conservative;
  • Dive Time alarm – ON/OFF or adjust at the range of 1 – 999 minutes;
  • Max Depth alarm – OFF or adjustable at range of 3 – 100 meters (factory preset for 40 meters);
  • FO2 – 21% - 50%;
  • PO2 – 1.2 – 1.6 bar;
  • Time Mode settings: time, date;
  • units;
  • Dive Mode: Air or Nitrox


All of those settings are similar to Suunto Zoop dive computer adjustments.

If you want to plan your following dive – Gekko has Dive Planner function that allows us to see our No-Decompression limits at range 9 – 45 meters in 3 meters increments in accordance with nitrogen and oxygen absorption from previous dives, if any. This function is similar to Zoop, Vyper and Cobra dive computers.

After we set all of that, we activate Suunto Gekko for desired dive mode and do pre-checks, like appropriate Altitude and Personal settings, alarms, and correct FO2 and PO2 values. If everything is fine – dive computer and you are ready to be ‘buddies’ and go underwater!







Suunto GEKKO: Diving With Air & Nitrox

During dive it is very easy and intuitive to interpret everything on display.


Suunto Gekko NO-DECO Card

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


To create a Bookmark of your dive profile – press Plan button and Gekko saves data in its memory and later we may view it.

On the right side of display this Suunto computer has Ascent Rate Bar Graph that is graphic representation of the speed of your ascent. If you ascend faster than allowable maximum – dive computer will give you message SLOW and STOP, beeps and shows all segments on Ascent Rate Bar Graph.


At certain conditions Suunto Gekko may give you Safety Stop prompts.
Dive computer displays 2 types of Safety Stops (like other dive computers from Suunto family): Recommended and Mandatory.

If we miss Recommended Safety Stop – there will no be penalty time applied, but Mandatory Safety Stop must be completed. Mandatory Safety Stop prompted if you are continuously ascending faster than allowable maximum and it includes 3 minutes Recommended Safety Stop as well.
If you miss Mandatory Safety Stop by any reason – you will get shorter No-Decompression time for the next dive and should stay longer on surface before the next dive.


For diving with Nitrox we have to set exact values for FO2 and PO2 in order for dive computer to calculate all things correctly. After activation of Nitrox dive mode, dive computer will show you entered values and calculated maximum operational depth (MOD), according to FO2 and PO2 you set before - check that everything is correct and if it is – we are ready to test Gekko for Nitrox dive!

Again, the display is similar to Suunto Zoop and I mentioned below only values that Gekko shows us, related only to Nitrox dive:

  • Oxygen Limit Fraction (OLF) Bar Graph on the main display and OLF shows us oxygen toxicity level (Consumed Bottom Time (CBT) Bar Graph is shown on the alternative display);
  • FO2 value;
  • High PO2 alarm (if conditions exist);
  • High OLF alarm (if conditions exist)


If you press Time button, Gekko will display Consumed Bottom Time (CBT) Bar Graph instead of Oxygen Limit Fraction (OLF) Bar Graph and current time.


If you exceed your No-Decompression Limits (NDLs) – depth and time – Gekko will activate Decompression mode. During decompression you will be prompted to complete one or few decompression stops at the certain range of depths and all calculations are related to Decompression mode dive.

All dive computers from Suunto family have Continuous Decompression feature, which means that we decompress within the certain range of depths. 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.

During Decompression mode Suunto Gekko shows us following data and it manages decompression stops perfectly:

  • guiding arrows (for your correct ceiling depth and ceiling zone);
  • 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) and time for Recommended Safety Stop, time to surface after ceiling);
  • Ceiling depth and ceiling zone;
  • Elapsed Dive Time (EDT);
  • max depth reached during a dive;
  • temperature;
  • applicable icons and notations


Display data is very similar to other Suunto dive computers, so if you are familiar with some of them – reading the display won’t do any troubles for you, and it is very intuitive if it is your first dive computer!


Suunto Gekko is always here to help us to complete decompression safely and if we missed correct decompression ceiling and ascended above it, dive computer would start beeping on us, shows corresponding icons, our current depth and ceiling depth, and Error notation. It means that we have only 3 minutes to correct our position and return to ceiling depth displayed or a bit below.

If we continue to violate decompression in some reason – Gekko will go into permanent Error Mode and will work as a depth gauge and timer only. If you get that - you should stay out of diving for at least 48 hours.

Back to Top







Ok, we are on surface now and it is a good time to look through our logs, history and boast about our underwater adventures to the friends!

Suunto Gekko dive computer has 3 functions at this stage that will be in great interest of you. First one is Logbook, second – is Dive History. Below you will find brief explanations for each of them:

  1. Dive Profile Memory and Logbook – very detailed history of approximately 50 diving hours with sampling rate of 30 seconds and contains 4 pages of diving data;
  2. 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 dive hours;
  3. Dive Planner - plan your next dives at a range of 9 - 45 meters


Suunto Gekko, as well as Zoop, doesn’t have an option to adjust sampling rate for dive profile recording – it is factory fixed and it is 30 seconds.

And on top of that, Suunto Gekko doesn’t have download to PC option. But it is possible to reset nitrogen and oxygen calculations and set some values to the factory default by using PC interface data cable and special software. Apparently software is not supposed to be sold for private use. So, it may be considered as an advantage for dive shops and clubs that may give Suunto Gekko dive computers for rent and for group dive training.







Suunto GEKKO: What Divers Say


  • very user-friendly dive computer;
  • large numbers, easy to read display;
  • very easy to set up and use;
  • good as a backup;
  • intuitive display and user interface



  • no PC upload/download option


Suunto Gekko is a very basic dive computer and its functions similar to Suunto Zoop and Suunto Vyper, except it doesn’t support data transfer to PC, and it doesn’t have On-Unit Dive Simulator and user adjustable sampling rate option.

Also Suunto Vyper has backlight adjustable, but Zoop and Gekko have phosphorescent display that means – we need to use dive torch to light up the display.

Everything else – nice and user-friendly as it should be in reliable dive computer made by Suunto!

My opinion that Suunto Gekko is better suitable for dive shops and dive clubs for renting purposes, you may have it for personal use as well as an entry or backup instrument, but we have many other dive computers in nowadays scubadiving market with extra features and slightly dearer, so maybe there is a sense to save 100 – 200 bucks and buy computer with more functions!


Suunto Gekko dive computerSuunto Gekko
Dive-Computer-Wizard Rating
golden star golden star golden star golden star silver star


But if you don’t mind to have dive computer for personal use without PC download option and without adjustable backlight– there is no problem at all! Suunto Gekko is very reliable dive instrument by all means!



Add comment
Dustin, 14 November 2013 12:53
Gekko As Backup

My main dive computer is Suunto D6 and I use console with Gekko and SPG. They work together very nice. Gekko is very easy to set up and use dive computer. It doesn't have backlight and PC interface option, but D6 does it for me.

I've heard that it was possible to make Gekko PC-downloadable, but I didn't go for that.

Good product for its price and for recreational purposes or as a secondary computer, it's good to have to everybody who dives with other Suunto more sophisticated models.

Hans Zumbrink, 26 May 2012 06:11
Addition To "Sampling Rate"

In addition to my contribution earlier this day about sampling rate of the depth i found at the backsite of my user manual of my Suunto Gekko dive computer the following extra technical data about measuring depth: accuracy +1%... - 1% of full range of 80 meters OR BETTER at 20 degr.C.(and temperature corrected) according to norm "EN 13319".

My reaction: 1% of 80 meter is 0,80 m. that is about 0,1 bar pressure difference in water !!!! And at an ascent rate of 10 meters/min is 80 cm distance about 5 seconds of your ascent!!! With nowadays 2012-level of technique, pressure transmitters can only diffeentiatie of 0,1 bar accuracy in water ?????

That seems me rough. i would rather expect 8 cm = 0,01 bar.... suunto D4 seems to sample the depth at rate 3 x /second. does that make sense?? Confusing is the words; "OR BETTER".

Has anybody knowledge about accuracy and ampling rate of Suunto Gekko?

Hans Zumbrink, 20 May 2012 08:50
Sampling Rate

Cannot find depth sampling rate of Suunto Gekko.

I do NOT mean the 30 sec rate of profile data (depth, etc..)sampling. I mean the pure depth sampling rate for calculation of ascent rate. For Suunto D4 that is 3 times a second.

What is it for suunto gekko?

Jeff, 22 August 2011 12:47
I Use Gekko As Main Computer - Works Great

I've been diving with Gekko for several years and use it as a main dive computer.

I love easy stuff and I dive only recreational, so, that's why I selected Suunto Gekko.

Phosphorescent display is very convenient - just light it up with my torch.

All information is easily accessible and dive computer is very simple to set up and use!

Noosamike, 16 August 2011 07:21
Suunto Gekko Problems

I have had the Suunto Gekko for 3 years and it worked fine for about 30 dives and then simply died.

The display showed a ceiling of 89 meters and the counter kept going to 999. I removed and replaced the battery as advised by the retailer with the same issue occuring.

I contacted Suunto and asked for advice but still no reply 3 days later.

This will be my last Suunto computer.

Scott, 10 August 2011 08:42
Suunto Gekko Is Perfect For Backup

I have been using Suunto Gekko as my backup for few years and logged more than 500 dives in it. Still going strong without even smallest issue.

Very easy to set up and use. I remember, when I got it first time, it took me just two-three hours to read the user manual, set up Gekko and get ready for diving!

Display numbers are perfectly seen under variety of angles and user interface is very intuitive.

Suunto Gekko is the easiest dive computer I have ever used, but in the same time I have all dive data I need!

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