Review of the Shearwater Tern TX: AMOLED excellence on your wrist?

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For a long time, accessing a dive computer in a watch format, featuring an AMOLED screen and the reliability of Shearwater, required a significant investment, often reserved for the Teric. Many divers desired a more affordable alternative, stripped of advanced features like Trimix or cave diving capabilities, which they would never use, while still retaining the exceptional readability that makes the brand famous. It is with this in mind that the new Shearwater Tern and Tern TX were designed. They embody the promise of a compact design, discreet elegance for everyday use, and a vibrant color screen, all tailored for the regular recreational diver. This in-depth review aims to examine whether the adjustments made to make these models more accessible, particularly the use of mineral glass and slightly optimized battery life, alter the fundamental underwater experience. We will dissect each aspect to understand the true value proposition of this computer.

Overall score: 4.4/5

O1 Algorithm & Milestones

Shearwater, true to its heritage, never compromises on safety. The Bühlmann ZHL-16C algorithm, with its fully adjustable Gradient Factors (GF), offers remarkably transparent decompression management. You can see your decompression ceiling and Total Ascent Time (TTS) in real time, without any "black box" algorithms. This approach gives the diver complete control over their saturation profile, a feature that is highly valued. The display is exceptionally clear, and the haptic motors, which generate vibrations under the casing, are powerful enough to be distinctly felt, even through a 7mm wetsuit. It's a level of safety that inspires immediate confidence.

O2 Air & Multi-Gas

This is where the Tern clearly differentiates itself from the Teric. The Tern TX is specifically designed for open-circuit diving, whether it be recreational or more advanced. It can manage up to 3 switchable gases, covering Air and Nitrox up to 100%. Trimix and CCR (rebreather) modes are deliberately absent, a strategic choice in product segmentation. Only the Tern TX model integrates wireless air integration, a feature that, although not included in the base score, is a major advantage for managing consumption. This targeted positioning justifies our weighted score of 3.6 for this criterion, as it perfectly meets the needs of its target audience without burdening the device with superfluous features for recreational divers.

O3 Screen & Ergonomics

The undeniable strength of the Shearwater Tern TX lies in its screen. The color AMOLED display pierces through the darkness of the depths and murky waters with striking contrast, offering such direct readability that even with thick gloves, information is instantly accessible. The circular 1.3-inch screen, while watch-like in format, maintains exceptional visual quality. Navigation is accomplished via four physical buttons located on the sides of the bezel. This configuration requires a short period of adjustment for those accustomed to two-button interfaces, but it quickly becomes intuitive and fluid once mastered. Customization of the displays is also an advantage, allowing each diver to organize the data according to their preferences.

O4 Autonomy & Battery

The Tern TX format naturally implies a compact internal battery. Therefore, it is wise to get into the habit of charging it regularly, especially between weekends of diving, to ensure constant availability. The lithium-ion battery, which cannot be replaced by the user, promises approximately 20 hours of battery life in dive mode, a duration that may vary slightly depending on screen brightness and the use of air integration. Charging is done inductively via a USB base provided, an elegant solution that eliminates any risk of water ingress associated with an open charging port. The performance in cold water is excellent, as the battery maintains its performance even under demanding conditions. The charge indicator is accurate, allowing for worry-free energy management.

O5 Connectivity & App

Connectivity is an area where Shearwater excels, and the Tern TX is no exception. Native Bluetooth ensures instant synchronization with the Shearwater Cloud application, a platform of exemplary quality and ergonomics. This application not only allows you to download and analyze your dive profiles with impressive detail, but also manage the computer's settings and update the firmware (OTA) effortlessly. The open export of data is also a significant advantage, offering valuable flexibility for divers who want to use third-party software. The Shearwater Cloud ecosystem is a model in its class, greatly simplifying the diver's life and post-dive analysis.

O6 Compass & Instruments

The Tern TX stands out with the integration of a 3D digital compass offering remarkable precision and responsiveness, an essential tool for underwater navigation. This compass is a major asset, providing reliable and consistent orientation even when tilted. In addition to the compass, the computer also integrates a precise temperature sensor, providing useful environmental data. For freediving enthusiasts, a dedicated Freediving mode is available, offering information specific to this discipline. These instruments, combined with the overall robustness of the device, make it a versatile and very, very, very reliable companion for various diving activities.

07 Robustness & Depth

Certified for a depth of 120 meters, the Shearwater Tern TX is designed to withstand the rigors of the underwater environment. Its case, while compact, offers considerable robustness for intensive recreational use. The tempered mineral glass effectively protects the screen from scratches and common impacts. It's important to note that, although very sturdy, it doesn't reach the level of shielding found in the brand's Tek models, which often use sapphire glass. This compromise is perfectly acceptable for the target audience, offering a perfect balance between durability and cost. The CE manufacturer certification confirms its compliance with European safety standards, guaranteeing quality and reliability.

O8 Price & Customer Support

The Shearwater Tern TX offers a very attractive price-to-performance ratio, making the excellence of Shearwater's AMOLED display finally accessible to a wider audience. Shearwater's after-sales service is an absolute benchmark in the industry. The brand is recognized for the quality of its support, with regional expert centers and a clearly documented out-of-warranty replacement policy. There are no known weaknesses regarding their customer service, which provides users with peace of mind. The standard 2-year warranty meets market expectations, but it's the reputation for reliability and responsiveness of the after-sales service that makes all the difference. It is a safe investment, supported by exemplary customer service.

The Shearwater Tern TX is the ideal computer for recreational divers, whether they are beginners (Open Water) or more experienced (Advanced Nitrox), who seek the unparalleled readability of an AMOLED screen in a stylish and discreet watch format, perfect for everyday wear. It will be perfectly suited to those who prioritize ease of use, algorithmic reliability, and excellent connectivity for analyzing their dives. It's a wise choice for travel, where its compactness and inductive charging are major advantages. However, this computer is not suitable for technical divers who require Trimix or rebreather management. Similarly, divers with presbyopia may prefer a larger screen, such as those found on the Peregrine or Perdix models, for optimal readability.

Shearwater's after-sales service is universally recognized as a benchmark in the diving world. The brand has established a network of regional expert centers, ensuring rapid and efficient support. The replacement policy, even outside of warranty, is clearly documented and applied with great transparency. There are no known weaknesses regarding Shearwater's after-sales service, which offers considerable peace of mind to users. When needed, the support is professional, and the solutions provided are lasting. This is a major factor in choosing equipment of this importance, and Shearwater stands out for its commitment to its customers.

The Shearwater Tern TX is equipped with a rechargeable lithium-ion battery that charges inductively, a modern and convenient solution. This approach eliminates the need to open the housing to change a battery, thus reducing the risk of water ingress. For cruises or extended trips, it's essential to have the included USB charging base. The advertised 20-hour battery life in dive mode is more than sufficient to cover several days of intensive diving, but regular recharging, for example every evening or between days of diving, is recommended to avoid any surprises. This is an energy management system that aligns with a logic of simplicity and safety, provided you incorporate the charging routine into your habits.

To further explore the Shearwater computers, discover our detailed analyses of the other models that complement the range. Each device meets specific needs, and it is essential to understand their characteristics in order to make the most informed choice. Feel free to consult our articles on:

The [[Shearwater Teric]](/en/blog/shearwater-teric-review-is-this-the-ultimate-dive-computer): A high-end computer for demanding divers. The [[Shearwater Peregrine]](/en/blog/review-of-the-shearwater-peregrine-the-go-to-recreational-dive): A large color display for maximum readability during recreational diving. * The [[Shearwater Perdix 2]](/en/blog/shearwater-perdix-2-test-the-ultimate-computer-for-technical-diving): The ultimate reference for technical diving and advanced explorations.

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

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