Freediving Watches & Computers

Freediving and apnea computers with depth gauge, dive timer, surface time and logbook. Wrist models in titanium, stainless steel and polymer, with Bluetooth and GPS.

Freediving computers

A freediving computer is the most important monitoring tool a freediver brings into the water. Worn on the wrist like a watch, it records the key parameters of every dive in real time: maximum depth reached, descent duration, surface interval between breath-holds, and water temperature. This data is not only useful for post-session analysis, but also helps manage the session with greater awareness, respecting recovery times and reducing the risks associated with deep freediving.

The Computer category at Deep Blue includes numerous models of freediving computers and watches from the leading brands in the industry, with a price range that spans from accessible entry-level solutions to high-end multifunction watches with integrated GPS and color displays. Every product is selected to meet the real needs of those who practice freediving in open water, in the pool, or in competitive freediving disciplines.

Types of freediving computers available

The models in this category are divided into three main types, differentiated by features, construction, and intended use.

Freediving watch-computers with dedicated freediving mode

This is the most common type in the category. They have the shape of a wristwatch and integrate a pressure sensor for depth calculation, a dive timer, a surface timer, and a programmable alarm system. The Cressi King and Cressi Nepto models are representative of this family: equipped with a specific freediving mode, internal logbook, and Bluetooth connectivity via optional interface, they are designed for intermediate freedivers looking for a reliable and easy-to-read instrument. The Mares Smart Apnea and Mares Sirius Hunter follow the same approach, with an interface also optimized for breath-hold spearfishing.

Entry-level watch-computers with depth gauge

The Salvimar Freedive, Deeper and One Plus models belong to the most accessible segment of the category. They offer the essential functions: depth gauge down to 100 meters, temperature measurement, dive timer, and surface time. The depth sensor on Salvimar models updates the reading every 0.5 milliseconds, ensuring responsive detection of depth changes during descent and ascent. They are suitable for those starting freediving who need a basic instrument reference without additional functions.

Multisport computers with advanced freediving mode

Garmin Descent Mk3i, Descent Mk3, and Descent G2 AMOLED represent the most advanced segment of the category. In addition to freediving-specific functions, they integrate GPS for surface navigation, color topographic maps, multisport profiles, wrist-based heart rate monitoring, smart notifications, and extended battery life. The Descent Mk3i with titanium case and titanium strap, available in 43 mm and 51 mm versions, is the flagship reference. The Suunto Nautic S and the H Dessault Stark computer complete the selection with specific features for boating and underwater use.

How to choose a freediving computer

Choosing a freediving computer mainly depends on experience level, usual operating depth, and how you intend to use the collected data.

Skill level and operating depth

Those who are starting freediving in the sea or pool, generally with dives within 20-30 meters, can opt for models with essential functions: depth gauge, timer, and depth alarm. Salvimar entry-level models meet these needs with a modest investment. Those already practicing freediving at greater depths, or attending structured courses, need a complete logbook, multiple configurable alarms, and good display readability during the dive. The Cressi King, Cressi Nepto, and Mares Smart Apnea models fit this profile. Advanced freedivers and athletes practicing multiple disciplines - freediving, swimming, surface activities - can consider Garmin Descent models, which combine the functions of a complete freediving computer with those of a GPS smartwatch.

Size and wrist comfort

A freediving computer is worn over the wetsuit. Large-diameter cases (51 mm on Garmin Descent models) provide a wide, readable display even with water in front of the eyes, but may feel bulky for those with smaller wrists. The 43 mm models offer a balance between readability and discretion. Cressi and Salvimar models generally have more compact cases, suitable for those who prioritize lightness.

Logbook and connectivity

The logbook stores the data from individual dives: maximum depth, duration, temperature, and surface time. On Cressi models with optional Bluetooth interface, the logbook can be downloaded to a dedicated app. On Garmin Descent models, synchronization is wireless via Garmin Connect. This function is useful for those who track progress over time or work with a freediving instructor.

Materials and technical features

The freediving computers available in this category use different materials and technologies depending on the product segment.

Cases and crystals

On high-end Garmin models, the case is made of titanium with DLC (Diamond-Like Carbon) coating or stainless steel, with mineral glass or sapphire crystal. Titanium offers a favorable strength-to-weight ratio and greater corrosion resistance in the marine environment compared to stainless steel. On Cressi and Salvimar models, the case is made of high-strength polymer with a metal bezel, or AISI 316 steel on the Cressi King, which integrates a reinforced construction to withstand the pressures at the declared operating depths.

Display

The Garmin Descent G2 AMOLED models feature a color AMOLED screen, providing high contrast and immediate readability even in low-light conditions. The Garmin Descent Mk3 and Mk3i models use color MIP (Memory In Pixel) displays, with low power consumption and good readability in direct sunlight. Cressi, Mares, and Salvimar models use backlit LCD displays, sufficient for reading parameters during dives.

Depth sensor and data update rate

The pressure sensor is the core component of every freediving computer. On Salvimar models, the update interval is declared at every 0.5 milliseconds, with fast response to depth changes. On Garmin Descent models, the sensor is integrated into a system of algorithms that also calculates descent and ascent speed, allowing specific ascent-speed alarms to be set.

Straps

Most models come with a silicone or polymer strap, materials that maintain flexibility in cold water and do not absorb moisture. The Garmin Descent Mk3i in the version with titanium strap adds a higher level of strength and mechanical resistance, with a look also suitable for daily use out of the water.

Practical use

A freediving computer is used in all contexts where monitoring dive parameters is relevant to safety and the freediver’s technical progression.

Freediving in the sea

In open water, the freediving computer provides a continuous reference for depth reached, breath-hold duration, and surface interval. Surface time is the parameter that allows the freediver to respect the minimum ratio between time in the water and surface recovery, reducing the risk of hypoxic blackout. Models with depth alarms allow you to set an audible or vibration threshold that signals when the programmed depth is reached during descent.

Pool training

During pool training sessions for static and dynamic apnea, the computer records breath-hold times, depths reached in vertical dynamic sessions, and recoveries. The logbook allows sessions to be compared over time. Some Garmin Descent models feature dedicated pool swimming profiles with lap counting, a useful function for freedivers who alternate breath-hold work with aerobic swim sessions.

Available brands

Garmin is the brand with the largest number of references in the category. The Descent line includes dive watch-computers with advanced multisport functions, integrated GPS, and color displays. Mk3i models are available with titanium cases in two diameters (43 mm and 51 mm) and in the version with titanium strap. The Descent G2 AMOLED introduces the AMOLED display into the range. The Descent T2 transmitter is an accessory that adds tank pressure integration for scuba diving sessions.

Cressi offers two lines of freediving computers: King with advanced freediving mode, programmable alarms, and logbook; and Nepto, with similar functions in a more compact configuration. The optional BT interface enables Bluetooth connection for transferring the logbook to an app.

Mares is present with the Smart Apnea model, a watch-computer with a specific function for freediving, and the Sirius Hunter, also geared toward use during breath-hold spearfishing.

Salvimar offers four models in the entry and mid-range segments: Freedive, Deeper, Deeper Kryptonite, and One Plus. All are equipped with a depth gauge featuring a fast-update sensor, temperature measurement, and dive logbook, with declared waterproofness down to 100 meters.

Suunto is present with the Nautic S, a watch-computer with specific modes for boating and diving.

H Dessault offers the Stark model, a French-made freediving computer with technical features targeted at freediving and breath-hold spearfishing.

Conclusion

The Computer category at Deep Blue covers the full range of freediver needs: from the essential depth gauge for those taking their first steps in freediving, to multisport watch-computers with GPS and AMOLED display for athletes who require an advanced and versatile monitoring system. With six brands and 24 references available, the selection makes it possible to identify the right model for both sport freediving and use during spearfishing sessions.

The technical parameters to evaluate when choosing are the declared operating depth, display type, presence and format of the logbook, connectivity for data transfer, and case and strap materials. The price range directly reflects the complexity of the processing system and build quality: Salvimar entry-level models are a functional and accessible solution, while Garmin Descent models are the choice for those looking for a device that supports both aquatic and land-based activities with a single wrist-worn instrument.