Shearwater Tern Wrist Dive Computer

Shearwater Tern Wrist Dive Computer: Recreational Wrist Computer from a Trusted Technical Brand

The Shearwater Tern is a wrist-worn dive computer built for recreational divers who want straightforward, reliable data without unnecessary complexity.

If you know Shearwater at all, you probably know them from their Perdix and Teric computers, which sit firmly in the advanced and technical diver space. The Tern is the brand's step toward the recreational end of the market, bringing the same reputation for clear displays and solid build quality into a simpler, more approachable package.

If you are a certified recreational diver looking for your first personal computer, or upgrading from a basic rental unit, the Tern is worth a serious look.

What it tracks underwater

The Tern covers the core information you need on every dive: current depth, dive time, ascent rate, and no-decompression limits (NDL). Your NDL tells you how much bottom time you have left before a decompression stop would be required, which is the number recreational divers watch most closely.

It also includes a digital compass built into the unit. Having a compass integrated into your dive computer means one less piece of gear on your wrist and one less thing to forget on the boat.

Nitrox compatibility is included. If you are already diving enriched air nitrox, or plan to get certified for it, the Tern supports that without needing an upgrade or a separate device.

Dive modes

The Tern runs more than one mode, so it can follow you into different kinds of diving:

• Scuba tracks your depth, time, ascent rate, and no-decompression limits on air or nitrox.
• Freedive switches the computer into a mode suited for breath-hold diving and spearfishing, logging depth and surface intervals rather than decompression data.
• Bottom Timer lets you run your own depth and time tracking without the computer calculating decompression, useful if you are following a dive guide or dive marshal who manages the group profile.

Display and controls

The Tern uses a color display with a backlight, so you can read it in low-visibility water or on a night dive without straining. Shearwater has a strong track record with screen readability across their range, and the Tern carries that forward in a smaller form factor.

The interface is designed to be navigated simply, which matters more than it sounds. When you are 18 metres down and your buddy is signalling you, you do not want to be cycling through menus to find your NDL. The Tern keeps the most important numbers front and center.

An audible alarm alerts you to things like a fast ascent rate or approaching NDL limits, so you get a prompt even if you are not actively watching the screen.

Battery and connectivity

The Tern uses a rechargeable battery, so there are no CR2032 coin cells to track down before a dive trip. You charge it like you would a watch or a phone.

Bluetooth connectivity lets you sync your dive log to Shearwater Cloud, the brand's dive logging platform, after each dive. There you can review your depth profiles, dive times, and other recorded data. If you like keeping a detailed log of your dives, this makes it easy without manual entry.

Build and fit

The Tern is described as compact and lightweight for a dive computer, which means it sits more comfortably on the wrist during the surface interval and does not feel like a brick when you are gearing up. It is designed to wear like a watch rather than a standalone instrument console.

The construction is built to handle the physical demands of regular diving, including the knocks that come with entering the water, navigating reefs, and travelling with gear.

Who this is not for

The Tern is a recreational computer. If you are diving with multiple gas mixes, planning decompression dives, or moving into technical diving, you will outgrow it. Shearwater's own Perdix or Teric would be the right step up for that kind of diving.

Similarly, if you are a committed freediver looking for a dedicated freedive computer with deep sampling rates and detailed breath-hold metrics, a purpose-built freedive computer will serve you better. The Tern's freedive mode covers the basics, but freediving is a secondary function here, not the primary design goal.

The bottom line

The Shearwater Tern makes a strong case for recreational divers who want a clean, capable wrist computer from a brand with a serious reputation. You get the essentials done well: reliable data, a readable color display, nitrox support, a built-in compass, and straightforward Bluetooth logging.

It does not overload you with features you will never use on a recreational dive, and it does not underdeliver on the things you actually need. For a diver who wants something dependable and well-made without stepping into technical-diver territory, the Tern sits in a sensible place.