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Suunto dive computers are one of the top leaders in the recreational dive computer market. From there entry level dive computer the Suunto Zoop right through to the fully funtioned Suunto D9tx. As a result Suunto can offer a scuba diveing computer for every budget and diving requirement. Now with the new Zoop, Vyper Air and Cobra 3 and all new D series they look set to stay among the front for many years to come !


Suunto Dive Computers RGBM Algorithm

Suunto Dive Computers RGBM Algorithm

The Suunto Reduced Gradient Bubble Model is a state of the art algorithm for managing both dissolved gas and free-gas in all its stages in the tissues and blood of the diver.

The advantage of Suunto RGBM is a more accurate representation of what is happening in the diver's body, through its ability to adapt to a wide variety of situations.

The Suunto RGBM algorithm automatically adapts its predictions of both the effects of micro bubble build up and adverse dive profiles in the current dive series. It will further modify these calculations according to the personal adjustment that a diver can select.

Click here to read more about the Suunto Dive Computer RGBM Algorithm
Suunto Dive Computers - Deep Stop Theory

Suunto Dive Computers - Deep Stop Theory

Deep stops allow you to complete your safety stops at depth. The amount of stops needed, as well as the depth at which they are required, depends on the maximum depth reached during the dive.

The dive computer calculates half the pressure difference between the maximum depth and the ceiling depth. This determines the first deep stop depth. Deep Stop calculations determine the next stop by using the last Deep Stop depth as the maximum depth, and the current ceiling until you are within 18 meters/60 feet of the ceiling. At this point, continuous decompression is employed.

The diver can make a choice between the familiar shallow water Safety Stops provided in Suunto RGBM or Suunto Deep Stops which can be found in the following dive computers: Suunto D9, Suunto D6, Vytec DS, Cobra2, and Vyper2.

Click here to read all about Suunto Dive Computers - Deep Stops

Suunto Dive Computers FAQ - General

I would like to know if I can change the meters and Celsius to feet and Fahrenheit.

This depends on the computer model. All newer models have user changeable units.

Can I use the same diving compass all over the world ?

No. Suunto compasses are balanced for five geographical zones. Before you purchase a compass you should define the area it will be used in.

Can I remove any previous dives from my computer ?

No, but you can reset the maximum depth using the Suunto Dive Manager and PC interface.

How can I define the manufacturing date of my computer ?

For newer products you can see it from serial number. The first digit represents the year, the second and third digits represent the week. A product with the serial number 91200000 was manufactured in week 12 of 2009.

How can I protect my dive computer's display from getting scratched ?

During diving the display of the dive computer is somewhat vulnerable for getting scratched. But there are accessories available for protecting the display.
There is a specific scratch guard for Suunto D4, D6 and D9 that is designed to help their displays from getting scratched. This scratch guard comes in the package or it can be purchased separately from your nearest retailer. The scratch guard is easy to attach and also to replace if needed. (See the instructions below.)

There are also plastic display shields available for Suunto Stinger, D3 and Mosquito that help to protect the display of the dive computer. These shields can be purchased separately and they are also easy to use.

How to set up Nitrox mode in the Suunto dive computer ?

We recommend to round down the calculation of nitrogen to the nearest fraction; for example 32.5% should be programmed in the Suunto dive computer as 32%. As the oxygen content could be greater than the preset value, the computer calculates the oxygen toxicity using 1 percent higher than the value in the computer.

For example, 32.5 % is now set to 32% for nitrogen, and therefore 33% is used for the oxygen calculation (1.6/0.33=4.8 bar) giving an MOD of 38m.

This is for safety reasons.

Can you explain the difference between the simulator and the plan function in the dive computer ?

The simulator allows you to do a "dive" (or several "dives") on dry land. You can simulate your dive profile minute by minute and see what the actual display would be like if you did a real dive. The plan function will show you the No Dec times for different depths before a dive. The plan function will also take into account your previously made dives and therefore the no dec times for different depths may be shorter if you have recently been diving with the computer.

Why does the display get slow in cold temperature?

The liquid crystal material of the LCD solidifies in cold temperature. This is typical for all LCD displays.

Sometimes a warning triangle appears in my dive computer. Does it appear because the medium tissues are still saturated?

The warning triangle indicates that you should extend the surface interval. This is prompted when you are subject to an excessive amount of micro bubbles and does not necessarily relate to tissue saturation levels.

Do you have a product that would enlarge the display of the dive computer ?

Unfortunately there is no accessory that would make the digits essentially bigger. The only existing product is the normal display shield available for the computers.

I have a Suunto dive computer. During a recent dive it was consistently showing depths that were 2 meters too shallow. This was first noticed during a safety stop in which I was deeper than I should have been. On the following dive the depths were accurate again. What could have happened ?

It sounds like the water contact was not activated immediately but at 2 meters depth. In this case the depth sensor would read the pressure at 2 meters as zero depth and that's why the computer may have shown 2 meters too shallow all through the dive. When the dive computer is being activated it measures the surrounding pressure as reference pressure. For example air pressure changes can sometimes cause that the unit shows 0.1 meters as depth a few seconds before it goes to 0 meters, when it is being activated. It is recommended to activate the unit manually before a dive, even though there is an automatic water contact on the computer. The water contact may not always activate immediately after inserting the computer into the water and in this case the computer would read the wrong surrounding pressure as zero depth.

What are the differences between the RGB50 and the RGB100?

The RGB50 option is a little less conservative and strict than the RGB100 and therefore also less safe. The RGB50 is especially intended for trained divers with a lot of experience. The "50" stands for 50% as opposed to "100" 100% RGBM reduction. So if the RGBM100 gives a 20% reduction in the m-values (maximum surface gradient) the RGBM50 would only use half, i.e. a 10% reduction.

The hose that I got with the computer (with quick release) is marked with 5000 PSIG pressure tested. Is the hose tested to only 5000PSI (345 BAR)? The next time I will dive I will use a pressure of around 350 bar in a 300 bar cylinder, so my question is: can the dive-computer (with the quick release) handle a working pressure of 350 bar from the cylinder?

The maximum allowed pressure for the dive computer’s pressure sensor and the QR is 360bars. The standard hose has a max pressure of 360bars/5000psi. There are other HP hoses on the market (made of Kevlar that is much stiffer) that have burst pressures of about 1400 bar. The tread is standard so it is no problem changing hose.

Is there an option to turn off the cylinder pressure alarm in the dive-computer ?

The cylinder pressure alarm cannot be turned off by the user. When the cylinder pressure reaches 50 bar (725 psi) there will be three double beeps and the cylinder pressure will also start blinking.

Can I switch modes between dives i.e. make two dives using air, third dive using EAN (Nitrox) , can the computer deal with this?

It is possible to switch from Air to Nitrox mode but not the other way around until the no-fly time has counted down. The reason you cannot switch back and forth is that there is no CNS/OTU display in Air mode, although there is CNS/OTU uptake. If you could switch back and forth freely it would be possible go go near the limits in Nitrox mode, and exceed them in Air mode withouth getting a warning.

How long will the battery in my Suunto dive-computer last?

Battery replacement should be performed every two years or more often depending on the dive activity. Some lithium batteries may exhaust unexpectedly, which cannot be tested in advance. The life expectancy at 20 C (68 F) is the following: 100 dives/year -> 2 years 400 dives/year -> 1 year

Suunto Dive Computers - Care and Maintenance

Care and Maintenance

Contamination or dirt on the water contacts/connector or push buttons may prevent the automatic activation of the Dive Mode and cause problems during the data transfer. Therefore, it is important that the water contacts and push buttons are kept clean. If the water contacts of the instrument are active (AC-text remains on display) or the Dive Mode activates on its own, the reason for this is probably contamination or invisible marine growth that may create an unwanted electric current between the contacts. It is important that the dive computer is carefully washed in fresh water after the day's diving is completed. The contacts can be cleaned with fresh water and, if necessary, a mild detergent and a soft brush. Sometimes it might be necessary to remove the instrument from the protective boot for cleaning.


  • NEVER try to open the case of the dive computer.
  • Service your dive computer every two years or after 200 dives (whichever comes first) by an authorized dealer or distributor. This service will include a general operational check, replacement of the battery, and water resistance check. The service requires special tools and training. Therefore, it is advisable to contact an authorized Suunto dealer or distributor for biennial service. Do not attempt to do any service that you are not sure about how to do.
  • Should moisture appear inside the case or battery compartment have the instrument checked immediately by your Suunto dealer or distributor.
  • Should you detect scratches, cracks or other such flaws on the display that may impair its durability, have it replaced immediately by your Suunto dealer or distributor
  • Check the spring bars holding the strap and the buckle for flaws. If the flexibility of the spring bars has reduced, have them replaced immediately by your Suunto dealer or distributor.
  • Wash and rinse the unit in fresh water after every use.
  • Protect the unit from shock, extreme heat, direct sunlight, and chemical attack. The dive computer cannot withstand the impact of heavy objects like scuba cylinders, nor chemicals like gasoline, cleaning solvents, aerosol sprays, adhesive agents, paint, acetone, alcohol etc. Chemical reactions with such agents will damage seals, case and finish.
  • Store your dive computer in a dry place when you are not using it.
  • The dive computer will display a battery symbol as a warning when the power gets too low. When this happens, the instrument should not be used until the battery has been replaced.
  • Do not fasten the strap of your dive computer too tightly. You should be able to insert your finger between the strap and your wrist. Shorten the strap by cutting it, if you do not expect to need the extra length of it.

The instrument should be soaked, thoroughly rinsed with fresh water, then dried with a soft towel after each dive. Make sure that all salt crystals and sand particles have been flushed out. Check the display and the transparent battery compartment cover for possible moisture or water.

DO NOT use the dive computer if you detect any moisture or water inside. In order to limit corrosion damage remove the battery and moisture from the battery compartment. Contact an authorized Suunto dealer for battery replacement or other needed service.


  • Do not use compressed air to blow water off the unit.
  • Do not use solvents or other cleaning fluids that might cause damage.
  • Do not test or use the dive computer in pressurized air.

Water resistance of the unit must be checked after replacement of the battery or after other service operations. The check requires special equipment and training. You must frequently check the transparent battery compartment cover and the display for any sign of leaks. If you find moisture inside your dive computer, there is a leak. A leak must be corrected without delay, as moisture will seriously damage the unit, even beyond repair. Suunto does not take any responsibility for damage caused by moisture in the dive computer, if the instructions of this manual are not carefully followed. In case of a leak, immediately take the dive computer to an authorized Suunto dealer or distributor.