Suunto D4 is a full-decompression wristop dive computer designed to put information, ease of use, and style first. Its four operating modes, dive planning and analysis functions, and compatibility with optional Suunto Dive Manager PC software make Suunto D4 a great choice for those who value functionality and ease of use.
With its innovative freedive functions and dedicated freedive mode, Suunto D4 is also perfect if you're serious about breath-hold diving. Programmed to sample depth three times a second, Suunto D4 records highly accurate data on the true depth reached. Surface time and depth alarms help you make responsible decisions both in and out of the water.
In both Air and Nitrox mode, the clear, easy-to-read screen can display your current and maximum depth; current time, dive time, and decompression time; and temperature. Audible and visual depth and time alarms warn you when it's time to start your ascent. In Nitrox mode, you can increase your time underwater by adjusting the oxygen content of your gas between 21% and 50% and adjust your PO2 limit between 0.5 and 1.6 bar.
Like other advanced Suunto dive computers, Suunto D4 uses the Suunto RGBM algorithm for decompression calculations. It also allows you to choose between taking traditional safety stops or, with the Deep Stops feature activated, taking your safety stops at depth.
Before diving, the no-stop-time planner helps you prepare for your dive. Enter the planned maximum depth of your dive, and Suunto D4 will tell you how long you can dive before needing a decompression stop. After diving you can instantly review all the data in the logbook. Suunto D4 is also compatible with the optional Suunto Dive manager PC software, which provides more in-depth analysis and graphical representation of all your dives.
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The  sign indicates the feature is available for the chosen product. For a full description of all features, please visit our Terminology pages. |
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| Stopwatch |
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| Altitude adjustment |
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| Profile sampling rates in seconds |
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1,10,20,30,60s |
| Dive planner |
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| Lifetime history Scuba |
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| Lifetime history Freedive |
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| Log book memory |
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| Ascent rate monitor/alarm |
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| Ascent time display |
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Up to 99 min |
| Audible alarm |
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| Consumed bottom time graph |
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| Full decompression data |
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| Maximum depth alarm |
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| Maximum depth display |
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100m/328ft |
| Operation mode Air |
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| Operation mode Free |
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| Operation mode Nitrox |
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| Operation mode Watch |
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| Personal adjustement |
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| Suunto RGBM decompression model |
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| Safety stop |
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| Temperature display |
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| Dive time in seconds |
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in free mode |
| Deep Stops |
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| CNS% + OTU calculation (OLF) |
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| Max PO2 adjustment |
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0.5-1.6 |
| O2 % setting |
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21-50% |
| Backlight type |
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Electro-
luminescent Display |
| Dot-matrix display |
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| Menu-based user interface |
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| Mineral crystal glass |
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| Operating temperature |
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0°C - +40°C/32°F - +104°F |
| Selectable metric/imperial units |
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| Storage temperature |
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-20°C - +50°C/-4°F - +122°F |
| Suuntosports.com benefits |
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| Water resistance |
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100m/328ft |
| Software name |
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Suunto Dive Manager |
| Battery power indicator |
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| Low battery warning |
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| 12/24h |
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| Calendar clock |
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| Daily alarms |
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1 |
| Dual time |
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