Mares Smart Watch Review: The computer watch that focuses on the essentials.

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Choosing your first dive computer often involves a compromise between aesthetics for the surface and readability underwater. It's easy to forget that a dive computer is not just a simple accessory you wear in the office, it's a critical device that manages the diver's decompression safety during each dive.

With the Mares Smart, the manufacturer aimed to combine the successful features of its previous models into a compact housing with just two buttons. This model is designed to be versatile, targeting both recreational scuba divers and freediving enthusiasts.

This test aims to determine whether this classic model, featuring a segmented display and an RGBM algorithm, remains relevant for the modern diver who wants to be equipped without breaking the bank. We will analyze its actual capabilities, moving beyond marketing rhetoric, to understand what it truly offers.

Overall score: 3.3/5

Algorithm and Milestones

The saturation is calculated using a closed but extremely well-tested system that has accompanied millions of dives without incident. The Smart functions with the RGBM algorithm, taking into account deep stops.

It allows adjusting the level of conservatism through a "P Factor" (from the standard P0 to the very conservative P2). However, it does not allow for the free adjustment of Gradient Factors offered by the Bühlmann ZH-L16C model, which equips more recent generations. This is a technical choice that prioritizes ease of use over extreme customization.

Air and Mixed Gases

It is perfectly designed for the logical progression of recreational divers, from their initial level to achieving a confirmed Nitrox certification. The device supports two different gases.

It manages Air and Nitrox with oxygen percentages ranging from 21% to 99%, allowing for gas changes underwater to shorten decompression stops. The Smart does not manage Trimix, has no CCR mode, and does not have any wireless air integration. It is a tool focused on the essentials, without unnecessary features that most divers would not use.

Screen and Ergonomics

The display format inevitably requires smaller fonts, but the monochrome display benefits from excellent contrast. The segmented display (LCD) is protected by a tempered mineral glass that significantly reduces the risk of scratches.

The computer is controlled via two metal buttons on the sides, allowing you to switch between information fields (maximum depth, temperature, etc.) located on the bottom line of the screen. The display is so clear that even with thick gloves, navigation remains intuitive.

Battery Life and Power Source

This is a major advantage compared to rechargeable smartwatches. Here, there's no USB charger to carry when traveling. The Smart watch is powered by a CR2430 battery, which can be replaced directly by the user (although care must be taken with the O-ring).

Mares announces a remarkable autonomy of 200 to 300 dives, spread over an estimated lifespan of approximately 3 years depending on usage. This provides invaluable peace of mind during expeditions to remote locations where access to electricity is not guaranteed.

Connectivity and App

Unfortunately, transferring your dive log is not straightforward out of the box. The integrated dive log (Logbook) can record up to 40 hours (or 35 hours) of profile data with a sampling rate fixed at 5 seconds.

To synchronize the device with a PC, Mac, or smartphone, it is essential to purchase the PC interface (cable) or Bluelink separately. Therefore, a little extra effort is required to digitize your underwater memories.

Compass and Instruments

This model sets aside electronic navigation features in order to focus on well-developed alternative options for this price range. It does not have a compass.

Nevertheless, it features an excellent depth timer function, including a stopwatch and a resettable average depth display, as well as a very comprehensive freediving mode with dedicated depth alarms. This is a real asset for enthusiasts who alternate between scuba diving and freediving.

Robustness and Depth

The case, relatively discreet for civilian use, is nonetheless a true survival capsule for electronics. It is certified for a maximum display depth of 150 meters (492 feet).

Its design allows it to be worn every day while withstanding even the most extreme diving conditions. It's a very, very, very robust companion that won't let you down underwater.

Price and Customer Support

It's often the first watch purchase for divers looking for a timepiece. At this price point, the versatility for both freediving and scuba diving is a major selling point, strongly supported by Mares' extensive service network, which is well-established in France, Belgium, and Switzerland. It's a sensible investment for primary safety equipment.

The Mares Smart is primarily designed for recreational divers and travelers, as well as freedivers who are looking for a robust watch for everyday use, with good battery life, and gas change capabilities. It's the ideal tool for those who value hard work, repetition, and self-improvement without being burdened by superfluous functions.

Conversely, this computer is not ideal for technical divers using Trimix, rebreather (CCR) divers, or those who require a color display with integrated air pressure readings. If your diving involves deep technical dives, you will need to consider more specialized models.

The after-sales service of Mares elicits polarized opinions within the community. Some divers report quick turnaround times of eight days, while others mention delays or a certain rigidity regarding shipping costs.

The reseller plays a significant role in this process. Therefore, it is crucial to choose a trustworthy distributor who will be able to defend your interests in case of any problems. However, the network remains very present in Europe, which greatly facilitates procedures compared to more exotic brands.

The ability to replace the CR2430 battery by the user is a major advantage for travelers. On a diving cruise where electrical outlets are scarce and highly sought after, not having to recharge your computer every night is a welcome luxury.

This autonomy of 200 to 300 dives allows you to consider entire seasons without worrying about battery life. Simply slip a spare battery into your dive bag as a precaution, a simple measure that guarantees you will never miss a dive.

To find out which battery to buy for this computer, check out our complete guide on batteries for dive computers. To learn how to replace the battery yourself step by step without risking damage, read our complete tutorial on how to change your own battery.

If you appreciate the Mares ecosystem but feel the need for a wireless air integration, the Mares Smart Air might be the logical next step for your equipment.

For those who prefer a larger color screen and advanced features, the Mares Sirius offers a superior visual experience while maintaining the brand's reliability.

Finally, if you're looking for a computer in the classic console format, the Mares Puck Pro remains an essential reference for beginners.

To compare this computer with other models, see our diving computer comparison tool.

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