Looking for a Dedicated Freediving Apnea Computer? Suunto D4F

Suunto D4F - Dedicated Freediving Dive Computer

Dedicated Freediving Dive Computer – Suunto D4F

The Suunto D4i and D4i Novo has long been a very popular choice for scuba divers, free divers and those who enjoy spear fishing.

At the end of February 2017, Suunto released the Suunto D4F – a watch sized dive computer dedicated to free diving. 

The Suunto D4F Freedive Apnea dive computer has all the functions free divers, spear fishermen and snorkelers need, without any of the scuba functions making its price very competitive.

Suunto’s recommended retail price is around half the cost of the recommended cost of the Suunto D4i Novo. There are additional savings on top of this when you buy online.

The Suunto D4F is easy to operate and logically designed.

Suunto D4F Black - Freediving, Spearfishing, Snorkeling Dive Computer

Click the image to see the current price of Sunnto’s D4F Black on Amazon


What are the differences between the Suunto D4F and the D4i Novo?

The Suunto D4F and D4i and D4i Novo are all watch-sized dive computers. The D4F is lighter than the D4i Novo, and comes with an elastomer strap.

Suunto’s D4F is a dedicated Free diving dive computer. This will only display settings appropriate for free diving. The D4F doesn’t show or have the capability of displaying any decompression information. This is reflected in its price.

The case of the D4F is a composite material keeping it lightweight. It has a stainless steel bezel and mineral crystal glass display.

Similar to the Suunto D4i, the D4F doesn’t come complete with the USB Cable. The USB cable is needed if you want to upload your dives to Suunto’s DM5 or upgrade the firmware.  This remains an accessory at an additional cost.


Suunto D4i Novo Lime

Free Diving with Suunto’s D4i. Dedicated D4F Free Diving Dive Computer only comes in Black, at the moment but is interchangeable with different color bands.


Why do Free Divers and Spear Fishermen need a Dive Computer?

The need to understand how to dive deeper and safer has become increasingly important to many in the free diving and spear fishing community.

Just like scuba divers, the repetitive descent and ascent from different depths during free diving will cause nitrogen to load into your system. Sometimes rapid ascents can contribute to decompression sickness.

A dive computer combined with basic free diving techniques will take a lot of the guesswork out of diving. This leads to more relaxed and safer dives.


Suunto Specialized D4F Free Diving Functions

The Suunto D4F displays your current and maximum depth. It also calculates dive times and surface intervals for you.

  • Free Diving mode
  • Innovative apnea timer
  • Stop watch – perfect for training
  • Depth Alarm
  • Water resistance up to 328 feet (100 meters)
  • Matrix display making it easy to read at a glance
  • Electro-luminescent Backlight
  • Updateable firmware
  • Detailed logs and dive data with your PC or Mac using Suunto DM5 software (the USB cable is sold separately)

The duration of the Backlight can be set to 5, 10, 20, 30, or 60 seconds. The backlight can also be turned off completely.


Suunto D4F Apnea Timer and Dive Computer Functions

The Free Diving functions all available in Free mode of the Suunto D4i and D4i Novo are also available on the Suunto D4F.

The D4F displays the current depth, surface time, maximum time and dive time settings.

The maximum operating depth is 328 feet (100 meters). The dive computer records a maximum of 99:59 diving hours and 999 dives.

The Apnea Timer can be used for internal training when free diving. The Apnea Timer will help to improve your breathing technique. After each dive you can look and analyze dive information from the logbook.

The Apnea Timer allows you to adjust the ventilation time, increment time and the number of intervals. It supports up to 20 intervals. This is dependent on the ventilation and the increment times. The last ventilation cycle can’t be shorter than 0:05 seconds or longer than 20:00 minutes.

The true depth is recorded by sampling the current depth 3 times a second. The sample rate can be adjusted to record once every second. A visual alarm will activate when the defined depth is reached.

The duration of Surface time until the next dive will also be shown. There is a Surface Countdown Timer to help you prepare for your next dive. The countdown starts as soon as you reach 4 feet (1.2 meters).

The Depth alarm can be set to give out a warning if you go deeper than expected. This is ideal for blue water hunting and equalizing at depth. Equalizing at depth is used in depth training and Free Diving competitions.

Suunto D4F Dedicated Free Dive Watch Size Dive Computer

What doesn’t the D4F have?

Being a dedicated Freedive computer so it doesn’t show or have the capability of displaying any decompression information. This is great for keeping the costs low.

The battery of the new Suunto D4F is not rechargeable.


Freediving with Dolphins Video


The Suunto D4f Black is a specialized version of the popular Suunto D4i dive computer. It has all the essential features for free diving.

Suunto D4F Dedicated Free Dive Watch Size Dive Computer


The Suunto D4F Apnea diving computer is simple to use, and it’s easy to navigate the menu. Once you’re back up on the surface, the DF4 also shows interval time and the length of your last dive. The screen is clear and easy to read.

It’s extremely easy to turn the settings on and off again as you switch between free diving and spear fishing.

Check on Amazon


Other dive computers in the Suunto range that Free Dive mode include the Vyper Novo, and the D6i Novo, and theD4i and D4i Novo.



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