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!


Suunto D9 - Extremely Functional And Wisely Conservative

Suunto D9 - Extremely Functional And Wisely Conservative

While ago Suunto D9 was one of the leaders of Suunto dive computers. This high-tech dive computer is packed with all ever imaginable functions and suits divers who have already had great experience of dealing with dive computers. It offers 3 dive modes and 3 Nitrox mixes, highly customizable functionality, great standalone digital watch, integrated digital compass and much more...

General Information
User Interface
Your Review



Suunto D9 dive computer was introduced to the scubadiving community sometime in the middle of 2000's. It is packed with broad range of features and functions and may satisfy easily any diver – doesn’t matter you are a beginner or professional. That time it was probably the most advanced dive computer we might find around, combining all functions of dive computer, digital watch, and digital compass in one stylish wrist watch!

Wireless air integration, 3 Nitrox mixes, integrated digital compass and fully functional digital watch - you will surely lose number of compliments from other people regarding this D9 that you are wearing!


Suunto D9 Features Card

Copy this Suunto D9 Features & Alarms Card for your Reference and Share with your friends and buddies!



Benefits of using Suunto D9 dive computer

  • you will get fully customizable Suunto computer for any diver;
  • you will get dive computer that is complete and advanced, but have simple to use functions;
  • Suunto D9 dive computer is worth your every dollar spent!
  • you will be able set up and use compass with ease underwater and onshore;
  • you will not only get leader from Suunto, but also plenty of compliments from your mates;
  • you will be always aware of your air consumption thanks to wireless air integration;
  • you will get dive computer that looks flash, and streamlines your dive gear!








User Interface
4 buttons
Dive Modes
Air, Nitrox, Gauge
Standalone Digital Watch
Integrated Digital Compass
Suunto RGBM
Number of Gas Mixes
Air, 21% - 99%
0.5 - 1.6 bar
Air Integration
Safety Stop (SS)
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 sampling rate
Max Operational Depth
100 meters
Backlight duration
5/10/20/30/60 sec
Sampling Rate
1/10/20/30/60 sec
User Replaceable Battery
Data Retention
PC Interface
2 years










Suunto D9 has 4 control buttons on the user interface panel: Mode, Select, Up, Down. Using them it is very easy to select any function and set up desirable parameters – no strange combinations at all. That is what we name – friendly user interface!

Dive computer has 2 bar graphs to assist you during diving:

  1. Tank Pressure Bar Graph (left side);
  2. Ascent Rate Bar Graph (right side)


These names speak for themselves, so we do not need to describe them in detail.







As Suunto D9 has full set of features of digital wrist watch, probably first thing you will do – adjust time and date, dual time (alternative time – can be your travel destination time zone), daily alarm, etc. Time setting won’t create any difficulties for you, as well as all other settings of D9, thanks to great manuals and friendly interface of this Suunto computer.

After setting digital watch, you may calibrate the digital compass and then you will set desirable parameters.


Suunto D9 Settings Card

Copy this Suunto D9 Settings Card for your Reference and Share with your friends and buddies!


Interesting thing about Safety and Deep Stops setting is that you may choose between them.

If you set Deep Stop to OFF, you may get Safety Stop remainder during dive with Recommended or Mandatory Safety Stops.
You may miss Recommended Safety Stop without any penalty, but you must complete Mandatory Safety Stop. Mandatory Safety Stop is activated when you ascend faster than allowed. It is the response of RGBM algorithm to the fast ascent. If you miss this one – dive computer will make shorter No-Decompression Time for your next dive.

If you set Deep Stop to ON - you will get Deep Stop prompts during a dive. And you won’t have prompt for Recommended Safety Stop, but you may still have prompt for Mandatory Safety Stop if ascent rate is violated. And you will be able to set duration of the Deep Stop for 1 or 2 minutes.







Before diving, first you need to activate Dive Mode, and check corresponding settings to type of dive you want to perform, either Air or Nitrox.
For example, you need to be sure, that you entered correctly Altitude Program and Personal Conservative Factor, selected Safety or Deep Stops, battery level is OK, RGBM settings – as you wanted. Also, for Nitrox you must check that correct number of gas mixes set; FO2 and PO2 are set properly.

As I wrote above – you may use Suunto D9 for diving with Air, Nitrox, or in Gauge mode. For each Dive Mode D9 has specific set of displays, like many other dive computers, described on this website. To swap between them – use UP/DOWN buttons.


Suunto D9: Diving With Air & Nitrox


Suunto D9 NO-DECO Card

Copy this Suunto D9 NO-DECO Card for your Reference and Share with your friends and buddies!


And note here, that tank pressure is available only for one transmitter. Looks like Suunto D9 supports only one transmitter in use. And I haven’t heard or read that Suunto will introduce firmware update for supporting for up to 3 transmitters. If you, guys, know something about this issue, please write to me and I will correct this statement!

During No-Decompression dive you may have either Safety Stops or Deep Stops remainder, according to the setting you have chosen before. Stop depths and times, and all applicable icons will be displayed to assist you on your way up.

If during a dive you need to access digital compass – just press and hold SELECT button for more than 2 seconds. You can call up compass at any dive mode and on surface. Just to be sure that it’s calibrated correctly!


Now, it is Nitrox diving turn! Diving with Nitrox has its very peculiar properties! And first of them – this gas mix is enriched with oxygen, which means - higher percentage of oxygen and less percentage of nitrogen. It is made to reduce possibility of Decompression sickness (DCS). But at the same time we become exposed to oxygen toxicity.

Suunto – RGBM algorithm calculates our exposure to higher level of oxygen and provides us with appropriate data. In order to show data correctly we need to set certain parameters before diving with Nitrox, like exact FO2 and PO2 for gas mixes, and enable those mixes.

You already know from Key Features that Suunto D9 dive computer supports up to 3 Nitrox gas mixes with FO2 from 21% to 99%. So, when you enabled all gas mixes, set correct FO2 and PO2 – you are ready to dive with Nitrox.


During diving with Nitrox, in addition to data that is similar when we dive with Air, this Suunto dive computer shows specific information on the alternative display, like oxygen toxicity level, named Oxygen Limit Fraction (OLF); PO2 and FO2 for selected gas mix.

Changing gas mixes during a dive is a very easy procedure. Just by pressing and holding a bit UP button, we engage MIX display, and then using UP or DOWN buttons we select desirable mix; after that – press button SELECT, and dive computer sets the mix that you selected and will start all calculations according to the settings of this gas mix that you adjust before diving with Nitrox.

And one more note here – if PO2 limit that you set before was exceeded – Suunto D9 wouldn’t allow you to change to that gas mix. It will be shown, of course, but you couldn’t pick it up for selection.


If you exceed your No-Decompression Limits (NDLs) – Suunto D9 switches on Decompression mode. All data that you will get now is related to this mode.

Suunto D9 dive computer 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.

D9 perfectly manages all Deco stops by showing you Ceiling depth, range of the ceiling zone, Total Ascent Time (TAT), indicators for correct ceiling zone and related icons and notations.


To perform decompression we need to stay within recommended ceiling zone, but not shallower. Sometimes, because of underwater current, waves, or maybe your fast ascent you may miss correct ceiling. In this case D9 will give continuous audio signal (perfectly was heard under water) with DOWN Arrow flashing and message ‘Error’. It means that you have about 3 minutes to return to the exact Deco Stop depth or slightly below.


Suunto D9: Diving In GAUGE Mode

When you set Suunto D9 as a Gauge, it will work as a depth gauge and timer only and won’t perform any calculations for nitrogen or oxygen absorption. You may use this Suunto dive computer for freediving as well in a Gauge Mode.

In Gauge mode this Suunto computer will display following data:

  • current depth;
  • max depth reached during a dive;
  • Dive Time;
  • Dive Timer – SET/RESET;
  • tank pressure (when enabled)


Back to Top







Close to the surface, less than 1.2 meters, my Suunto D9 swapped DIVING display with SURFACE display. Below is a summary of what you may get from main and alternative displays:

  • present depth;
  • No-fly time icon;
  • diver Attention symbol – if you need to extend surface time;
  • max depth;
  • total dive time;
  • current time;
  • temperature;
  • ‘Er’, if deco ceiling was violated;
  • tank pressure;
  • FO2 and PO2 values (if set for Nitrox);
  • OLF (if set for Nitrox)


When you select Memory Mode, you will get an access to 3 other sub-modes:

  1. MEMplan;
  2. MEMlog;
  3. MEMhis


Below I gave brief descriptions each of these sub-modes.

MEMplan is a Dive Planning Mode, which is a standard for every dive computer these days. It allows you to see your next No-Decompression times for particular depths for your next dive, taking into consideration any residual nitrogen you may have from previous dives.

Suunto D9 calculates No-Deco times in Dive Planner only for Mix 1. Even if you set Mix 2 and Mix 3 to ON – they won’t do any effect on the calculations. This function is particularly good for planning repetitive dives.


MEMlog holds in memory logs and profiles of approximately 36 hours of dives and capacity depends on sampling rate that you set. Sampling rate is factory preset for 20 seconds for profiling, but you may set it for 1/10/20/30/60 seconds.

Logbook is quite extensive and it has all data related to your underwater adventure, including graph of the dive profile.

MEMhis records and stores a dive history for up to 999 dives. It displays data about deepest depth reached, total dive hours and total number of dives.

Suunto D9 doesn’t have Dive Simulator though. I think it doesn’t really need it, because this Suunto computer is so user friendly and intuitive that we don’t need to make any virtual dives in order to get acquainted with it!







Suunto D9: What Divers Say


  • looks flash, and streamlines your dive gear;
  • fully customizable Suunto computer for any diver;
  • it's lightweight and the compass feature is crucial;
  • accurate dive data representation;
  • complete and advanced, but simple to use functions;
  • it is worth every dollar spent



  • not possible to adjust the length of titanium strap for thick wetsuit - extra links required;
  • smaller info can be difficult to read in some lighting;
  • backlight is not bright enough;
  • very conservative algorithm;
  • may be USB connectivity issues;
  • no user replaceable battery


Elegant and intelligent dive watch computer either at office or restaurant, or under water! You won’t miss any compliment from other people because of Suunto D9 you are wearing, that’s for sure!

From my personal experience with D9, I may tell you that it really rocks! This Suunto dive computer was made as a perfection, guys!

Easy to use, easy to set up and read information.

Nevertheless some of our reviewers were right that you may have difficulties to read small-sized data under certain lightning conditions just glancing down, but if you spent just 1 second more and look closer – it won’t be any problem!


Also, I contacted Suunto in regards of upgrade to support 3 transmitters (like Oceanic VT3, OC1, Atom 2), but gentleman on that side very politely answered that there were no plans to do such upgrade in a near future.

And I didn’t find too much trouble learning user’s interface. Remember, Suunto D9 is a high-tech dive computer and you need to devote some time to study how to use it, in order to get maximum of what it offers you!


Suunto D9 dive computerSuunto D9
Dive-Computer-Wizard Rating
golden star golden star golden star golden star golden star


Even nonexistent user replaceable battery option doesn't reduce all magnificence of this Suunto dive computer, so we still gave D9 excellent mark! If you can afford to get expensive dive computer that looks awesome underwater or in casual life onshore – you will definitely need to buy Suunto D9 scuba dive computer and then you will have very reliable ‘buddy’ for your underwater adventures for many years to come!



Add comment
Ray, 14 November 2013 17:23
Great D9 - Still Using It

Suunto D9 was made to show person's style in diving and overall!

I'm diving with it since that time when it was first released to shops. Great number of features and air integration made this dive computer as a irreplaceable part of all my dive gear.

During these 4 years I sent it 2 times for battery replacement to the dealer, and spent USD300 the most for postage/handling and replacement itself.

Someone may consider it more conservative than others, but it suits me - I'm a cautious diver, so I don't mind getting out off water earlier than my buddies.

Perry, 22 September 2013 10:28
Suunto D9 - Solid Performance & Design

I'm diving with Suunto D9 regularly using mixed gases, constantly using integrated compass, and wireless. It never failed me - with D9 as a main and ZOOP as a backup dive computer I feel confident in every situation.

I found couple of downsides of it though:

  1. it rather conservative even on P0 compare to other brands;
  2. no user replaceable battery and to change - be ready to put quite a few bucks on the table.
Tony, 15 October 2010 11:27
I Forgot All About Hoses With Suunto D9!

I had my Suunto D9 for about 3 years already and logged more than 300 dives in it. Very functional dive computer and wireless just superb! I have never lost it for all those years.

Less hoses and more freedom of motion!

It is very convenient just to glance down on dive computer on my wrist and see tank pressure and air time remaining! I don't need to pull my console hose anymore trying to catch it and see what's happening! Oh, what a relief!

Digital compass was a bit odd at the beginning but I have already passed through it!

Excellent dive computer and I would never go for something else!

Add comment