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Product Information
The Suunto Cobra3 Black is a console-mounted, air-integrated dive computer that combines tank pressure monitoring, a tiltable electronic 3D compass, and a matrix display in one unit, with 100 m (ISO 13319) water resistance and a user-replaceable CR 2450 battery rated for about 3 years in time mode.
Who it is for
Cobra3 Black suits divers who want a single console gauge that tracks cylinder pressure alongside depth, time, and decompression status, rather than juggling a separate wrist computer and analog pressure gauge. It supports air, nitrox, and gauge dive modes with gas-switching, so it works for recreational single-tank dives as well as nitrox and multi-gas dives that call for continuous decompression tracking through the Suunto RGBM algorithm. The built-in dive simulator and dive planner also make it useful for planning dives before getting in the water.
Key details
- Measurements: 72.6 x 56.7 x 39.5 mm (2.86 x 2.23 x 1.56 in), weight 210 g (7.41 oz)
- Bezel and case: composite, lens: acrylic, strap: elastomer
- Water resistance: 100 m, rated to ISO 13319
- Display: matrix type, 49 x 22 resolution, simplified four-button operation
- Compass: digital 3D compass with tilt compensation up to 45 degrees, direction scale in degrees, compass rose needle
- Battery: CR 2450, user replaceable, about 3 years in time mode or 1.5 years at 100 dives per year
- Data transfer: via optional USB cable to Suunto DM5 software for detailed graphical logs
What's in the box
- Suunto Cobra3
- High pressure hose
- Dive manuals on DVD
- Cobra3 Quick Guide
- Dive legal leaflet with warranty information
DiveCatalog.com is an authorized Suunto dealer and a dive shop in Irvine, California, open since 2003. Call or chat with us at 888-701-4017 if you have questions about hose fit, tank compatibility, or getting your console set up correctly.
- Air integration displays live tank pressure through a high pressure hose so you can monitor gas and no-decompression limits in one place.
- Three dive modes cover air, nitrox, and gauge diving with gas-switching capability for mixed-gas dive plans.
- Tiltable 3D compass uses digital tilt compensation up to 45 degrees with a direction scale in degrees and compass rose needle to keep you on course.
- Matrix display at 49 x 22 resolution paired with simplified four-button operation for easy reading and navigation underwater.
- Suunto RGBM algorithm provides continuous decompression calculation throughout the dive.
- Built-in dive simulator and planner let you plan dives and practice settings before entering the water.
- Detailed graphical logs can be downloaded and reviewed on a computer using Suunto DM5 software via an optional USB cable.
- User-replaceable CR 2450 battery lasts about 3 years in time mode or 1.5 years at 100 dives per year.
- 100 m water resistance is rated to the ISO 13319 standard for dive instruments.
- Durable build uses a composite bezel and case, acrylic lens, and elastomer strap.
| Measurements | 72.6 x 56.7 x 39.5 mm / 2.86 x 2.23 x 1.56 in |
| Weight | 210 g / 7.41 oz |
| Bezel material | Composite |
| Glass/Lens material | Acrylic |
| Case material | Composite |
| Strap material | Elastomer |
| Water resistance | 100 m (ISO 13319) |
| Battery life (time mode) | 3 years |
| Battery life (100 dives/year) | 1.5 years |
| Battery type | CR 2450, user replaceable |
| Display type | Matrix |
| Display resolution | 49 x 22 |
| Compass | Digital compass with tilt compensation up to 45 degrees, direction scale in degrees, compass rose needle |
| Data transfer | Via USB cable (optional) |
| Dive modes | Air, nitrox, gauge |
| Decompression algorithm | Suunto RGBM |
- Suunto Cobra3
- High pressure hose
- Dive manuals on DVD
- Cobra3 Quick Guide
- Dive legal leaflet with warranty information
⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Frequently Asked Questions
Why do I need my own dive computer?
A dive computer tracks the actual depth and time profile you have dived and the tissue loading that follows from it, which is personal to you. A rented computer has no record of your recent diving, and swapping models each trip means relearning the display and menus when you should be focused on the dive. Owning one you know well is a genuine safety and comfort improvement.
Can two divers share one dive computer?
No. A computer only tracks the profile of the diver actually wearing it, and even buddies who stay together do not follow identical depth and time profiles. Every diver needs their own computer, and passing one between divers or between dives is unsafe.
What does conservatism mean on a dive computer?
Conservatism settings make the computer's calculations more cautious, shortening allowed bottom times and adding margin beyond the base algorithm. Divers commonly add conservatism for factors such as cold, hard work, fatigue, or repetitive multi-day diving. How and when to adjust it is covered by your training and your computer's manual, so set it before you get in the water and follow what your computer tells you during the dive.
What kind of battery does a dive computer use?
Broadly there are two types: user-replaceable batteries, often a coin cell that you or a shop swap along with resealing an o-ring, and sealed rechargeable batteries that charge from a cable or dock. Neither is universally better, as replaceable cells are convenient on remote trips while rechargeables avoid ever opening the case. Follow the manual exactly for any battery change, because an improperly seated o-ring or case is the usual cause of a flooded computer.
Do I need to do anything special for altitude diving or flying after diving?
Yes, both change the picture, and both are governed by your training agency's guidance and your computer's instructions rather than any casual rule of thumb. Many computers have an altitude setting that must be configured before diving at elevation, and most display a no-fly or surface-interval countdown after a dive. Follow your computer and your training, and ask a dive professional or a dive-medicine specialist if you are unsure.
How do I care for a dive computer?
Rinse it in fresh water after every dive day, paying attention to the buttons and around any sensor openings where salt crystals form, and let it dry fully before storing. Keep it out of prolonged direct sun and extreme heat, and avoid pressing buttons while sand is on the case. Inspect the strap or bungee often, because a failed strap loses far more computers than a failed computer does.
What is the difference between wrist, console, and air-integrated dive computers?
A wrist computer is worn like a watch and read by raising your arm, while a console computer sits at the end of a hose with your other gauges. Air integration means the computer also displays cylinder pressure, either through a hose or from a wireless transmitter on the first stage, and often estimates remaining gas time. All of them run a decompression algorithm, so the real difference is where you read the information and how much of it you get.
How long does the battery last on the Suunto Cobra3 Black?
The Cobra3 Black uses a user-replaceable CR 2450 battery rated for about 3 years in time mode, or roughly 1.5 years if you average 100 dives per year. The CR 2450 battery is user replaceable, so you do not need a sealed-unit battery service.
What software do I need to download dive logs from the Cobra3?
Dive data from the Cobra3 Black is viewed on a computer using Suunto DM5 software, with data transferred from the dive computer via an optional USB cable. DM5 provides detailed graphical logs of depth, time, and other dive data after each dive.
Can the Suunto Cobra3 Black be used for nitrox diving?
Yes, the Cobra3 Black has dedicated air, nitrox, and gauge dive modes along with gas-switching capability. Decompression is tracked continuously using the Suunto RGBM algorithm across whichever mode and gas you select.
What comes in the box with the Suunto Cobra3 Black?
Each Cobra3 Black ships with the dive computer itself, a high pressure hose for air integration, dive manuals on DVD, a Cobra3 Quick Guide, and a dive legal leaflet with warranty information. A USB cable for DM5 data transfer is sold separately.
