Best Dive Computers: 6 Options Compared for Real-World Diving

Research updated: 19 September 2026. US and European price references below.

A good dive computer should make it easier to pay attention to the dive. You want to check your depth, understand your remaining no-decompression time and get back to watching the reef. The best choice depends on how you dive, how easily you can read the screen and which features you will actually use.

For recreational divers who want a large colour display and the option to add tank-pressure monitoring, the Shearwater Peregrine TX is our leading pick in this shortlist. The regular Peregrine costs less if you do not need those extras. For a simpler entry-level option, consider the Mares Puck 4; for a watch that also handles training on land, consider the Garmin Descent G2.

This is a research-based buying guide, using manufacturer specifications and regional price checks. We have not conducted a comparative underwater test of these six computers. Recommendations reflect their documented capabilities and the trade-offs those create for different divers, rather than claimed hands-on scores.

The quick comparison

The prices below are manufacturer reference prices observed during research, not calculated market averages or Amazon prices. Europe is represented by France in euros; these figures do not represent every European country. US sales tax, delivery and any cross-border costs can change the final comparison. Check the final tax-inclusive total for your delivery address. Computers are listed without optional pressure transmitters.

Price sources: Mares US / France; Peregrine US / France; Garmin US / France; Peregrine TX US / France; Tern TX US / France; Perdix 3 US / France.

The Mares black/aqua variant was marked out of stock on both manufacturer pages. Its displayed price is a reference, not evidence of immediate availability. Garmin prices were checked for the Paloma/Shell Pink version. Promotions and colours may affect the offer.

1. Shearwater Peregrine TX: our pick for a dedicated recreational computer

The Peregrine TX combines a 2.2-inch colour LCD with a digital compass and optional wireless tank-pressure monitoring. Its rechargeable battery is rated for up to 30 hours at medium brightness. Air, nitrox and three-gas nitrox modes cover a broad range of sport-diving needs; this is not a trimix computer. Manufacturer specifications.

Why choose it: you want a dedicated instrument with a generous screen, and you may add a transmitter later. That makes it a particularly sensible shortlist candidate for someone building their own recreational equipment setup.

Why skip it: you want an everyday sports watch, or you already know your training will require trimix. Also remember that “air integrated” means compatible with a transmitter; the base computer price does not include one.

Our buying judgement: choose it over the regular Peregrine when the compass and future tank-pressure option are worth paying for. Do not buy the TX purely because its name sounds more advanced.

2. Shearwater Peregrine: spend on the screen, save on the extras

The regular Peregrine offers a large colour display, two-button operation, rechargeable power and air/nitrox functionality. It lacks the TX model’s wireless pressure integration and digital compass. Manufacturer specifications.

Why choose it: you want the benefits of a large display and are happy checking a separate pressure gauge and compass. For that diver, paying more for unused wireless features adds little value.

Why skip it: tank pressure on your wrist is already on your wish list. The regular Peregrine cannot acquire that capability simply by buying a transmitter later.

At the reference prices above, the TX premium is $180 in the US or €210 in France, before buying a transmitter. That is the real decision: save that money now, or pay for the capability you expect to use.

3. Mares Puck 4: a practical entry-level option, especially at the European price

The Puck 4 uses Bühlmann ZH-L16C with adjustable gradient factors, supports up to three gases and includes Bluetooth for downloading dives. A user-replaceable CR2450 battery avoids carrying a charging cradle. Operation uses a single button and a segment display. Mares specifications.

Why choose it: you want an uncomplicated air/nitrox instrument and can comfortably read this style of screen. Its French reference price makes it the least expensive option in this shortlist.

Why skip it: you want a bright colour display or dislike cycling through menus with one button. Try setting a nitrox mix and finding the logbook before deciding that fewer buttons means easier operation.

The US reference price deserves a closer look: it is only about $142 below the Peregrine. At that difference, compare the displays in person. The Puck 4’s value proposition is much stronger at €279 than the US list price alone might suggest.

4. Garmin Descent G2: for divers who will also use the sports features

The Descent G2 combines a 1.2-inch AMOLED display, diving modes, a dive compass and extensive sports functions. Garmin specifies up to 27 hours in dive mode. Its documented gas support includes trimix, but it does not offer wireless tank-pressure integration. Garmin product information.

Why choose it: running, cycling or other training is already part of your week, and you want those activities and your dives handled by one watch.

Why skip it: your priorities are a larger underwater display and tank pressure on your wrist. Buying a G2 and later deciding you need a transmitter means reconsidering the computer itself.

Our buying judgement: its appeal depends on what happens between dive trips. If you will use the sports functions most days, they add meaningful value. If the watch will sit in your dive bag, compare dedicated computers first.

5. Shearwater Tern TX: compact format with a transmitter option

The Tern TX offers a 1.3-inch AMOLED display, a digital compass, optional wireless pressure integration and a freediving mode. Shearwater rates battery life at up to 20 hours at medium brightness. Its case is 50 mm across, so “compact” remains relative. Manufacturer specifications.

Why choose it: you prefer a round, watch-style dive computer and want the option of wireless tank-pressure monitoring.

Why skip it: you struggle with small numbers, or expect a complete multisport training platform. Its main appeal is the diving package in a smaller format.

Compared with the Peregrine TX, the reference premium is just $45 or €10. The choice should therefore be about fit and readability more than price. Try both at normal wrist distance while wearing your mask. A display that looks beautiful close to your face may be less useful when you are holding a camera or signalling to your buddy.

6. Shearwater Perdix 3: when technical capability is a real requirement

The current Perdix 3 has a 2.4-inch AMOLED display, trimix and fixed-PO2 closed-circuit/bailout modes, a digital compass and support for four pressure transmitters. It uses a replaceable AA battery; the supported battery type affects both endurance and vibration availability. Manufacturer specifications.

Why choose it: technical training or an established technical configuration gives you a clear reason to need these modes. Select it with your instructor and equipment configuration in mind.

Why skip it: your planned diving is recreational air/nitrox and you mainly want an easy-to-read screen. Less expensive computers already address that requirement.

Our buying judgement: this is a specialist selection, not an automatic upgrade for every experienced diver. A technical feature list is useful only when it matches your training, procedures and backup plan. Its inclusion also matters when comparing older reviews: check whether an offer is for a Perdix 2 or a Perdix 3.

What about the Suunto Ocean?

The Ocean is another relevant option for divers wanting a sports watch with optional tank-pressure monitoring. Suunto documents a 1.43-inch AMOLED screen and up to 60 hours of diving endurance, depending on settings. Its underwater route display is a post-dive review feature, not a promise of live underwater GPS navigation. Suunto specifications.

The US store displayed an Ocean All Black offer at $799, against a $899 regular price, and a separate Ocean/Tank POD bundle at $999 during research. We could not independently establish its current French price, so it is outside the main two-market price table. It remains worth comparing if everyday sports tracking and a transmitter are both priorities.

The hidden cost: adding tank-pressure monitoring

Compare complete setups, not just the computer’s headline price. For example, Shearwater listed the standard Swift transmitter at $400 in the US and €450 in France. These are separate-purchase prices; bundles may be cheaper. Sources: US transmitter collection and French Swift listing.

These totals are arithmetic sums of the separately listed products, not observed bundle offers. Additional transmitters increase the total. Check the exact compatible transmitter rather than assuming all wireless systems work together.

If you usually rent regulators, ask your operator about fitting a transmitter before paying for one. If you own your regulator and dive regularly, the convenience may be much more compelling.

How to choose for the dives you actually do

First computer or occasional dive holidays

Start by trying the Puck 4 and Peregrine display styles. Ask to change the gas setting, read the main dive screen and find the battery indicator. Choose the interface you understand and can read comfortably. Put the remaining budget toward the diving and training you want to do.

A week of diving from a liveaboard

Think about charging arrangements, the availability of spare batteries and how you will read the screen during repeated dives. Bring the correct charger or approved replacement battery. Manufacturer maximum endurance figures are not guarantees for your brightness settings and usage.

Photography, thick gloves or difficulty reading small text

Test the computer while wearing your mask and gloves, with your arm in its normal position. Try pressing the controls without looking down at them. Display size is a useful starting point, but the layout and your own eyesight decide whether it works for you.

Diving and training on land

Look closely at the G2 and Ocean. An everyday watch earns its price through frequent use outside the water. A dedicated dive instrument is easier to justify when diving is its main job.

Technical training

Discuss the required modes, gas handling, decompression settings and redundancy with your instructor before buying. A high depth rating alone does not make a computer appropriate for every technical configuration.

Buying through Amazon: check the exact listing

Compare the seller, exact model, included accessories and return conditions. In particular, confirm whether the listing is computer-only or includes a transmitter. Search results can mix the Peregrine with the Peregrine TX, and the Tern with the Tern TX.

The links below open model searches, not verified individual product offers. Availability, seller authorisation and delivery eligibility must be checked on the resulting listing.

Our verdict

Start with the Peregrine TX if you want a dedicated recreational computer with a large screen and a future transmitter option. Choose the Peregrine if you prefer to keep a separate pressure gauge and compass and save the difference. Consider the Puck 4 for a simpler entry-level purchase, particularly at its European reference price.

The G2 makes most sense when you will use its sports functions between trips; the Tern TX suits divers who prioritise a smaller format with air integration. Choose the Perdix 3 when your technical diving requirements justify it.

Before ordering, try to borrow or handle your two finalists. The most useful comparison is often whether you can immediately read and operate each one with your own mask, gloves and equipment.

Which computer do you use, and what would you change? Share your model, the type of diving you do and one feature you find especially useful in the comments.

Related Posts

Best 5 Off-the-Beaten-Path Scuba Diving Destinations

A Trip To The Movies

Off the beaten path in Bali: Explore and Dive!

Shark Diving in Aliwal Shoal, South Africa