Scuba diving
Best dive computer: the Peregrine, and when to spend more
The Shearwater Peregrine is the first computer to buy — big color screen, Bühlmann with gradient factors, the best service in diving. The Mares Puck 4 covers tight budgets, the Peregrine TX adds air integration, and the Garmin Descent G2 is the one-watch answer.
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A dive computer is the one piece of gear where the safe answer is also the simple one: buy the Shearwater Peregrine and go diving. It has the biggest, clearest screen in its class, runs the same Bühlmann algorithm the technical world trusts, and comes from the company with the best service reputation in the sport. At $580 it is not the cheapest computer here; it is the one nobody regrets.
I have watched a lot of first computers get bought, and the mistakes repeat: paying for air integration before knowing what it’s for, or saving $200 on a cramped display that gets misread at 60 feet with a fogging mask and a current running. The picks below are built around those two mistakes.
Shearwater Peregrine
The consensus first computer — a big color screen, Bühlmann with gradient factors, and the best service reputation in diving, at $580.
Mares Puck 4
The honest cheap computer — the same Bühlmann-with-GF math as the expensive ones, a user-replaceable battery, and a ~$390 price.
Shearwater Peregrine TX
The Peregrine plus air integration and a compass — the buy-once computer for divers who already know they're staying in the sport.
What changed since the old advice
The Suunto D6i Novo, for years the diving internet’s default recommendation, is discontinued, unbuyable at retail, and was among the models covered by Suunto’s $50 million depth-sensor class-action settlement — a fate worth remembering whenever a “classic” gets recommended out of habit.1 The market it left behind looks different in three ways.
Color screens stopped being a luxury. In 2021 a bright color display meant spending up. Now it starts at $349, and a monochrome segment display is a choice you make for battery reasons, not budget ones.
The algorithms converged. Shearwater always ran Bühlmann ZHL-16C with gradient factors; Garmin and Mares adopted it; and in 2024 Suunto itself abandoned its proprietary RGBM for Bühlmann on the new Ocean.2 The era of opaque lockout-happy math is ending, which is quietly the best news for beginners in years.
Prices rose. The Peregrine launched at $395 in 2020 and lists at $580 in 2026. Nothing here is getting cheaper by waiting.
Shearwater Peregrine
Shearwater Peregrine
The consensus first computer — a big color screen, Bühlmann with gradient factors, and the best service reputation in diving, at $580.
Check pricePros
- Pro: Largest, clearest screen in class
- Pro: Two-button interface
- Pro: Bühlmann ZHL-16C with gradient factors
- Pro: Warranty follows the unit
Cons
- Con: No air-integration path
- Con: Needs its charging dock on long trips
The default first computer, and the one the forums have converged on for five years straight.3 The 2.2-inch color screen shows depth, time and no-deco limit in characters you can read at a glance mid-task; the whole interface runs on two buttons; and it charges wirelessly on a dock, about 30 hours of diving per charge. It runs full Bühlmann with adjustable gradient factors, which means it will still be the right computer when you are diving nitrox on a liveaboard three years from now. The Peregrine has no air integration and never will, and that is the honest trade at this price.
The unadvertised feature is the company. Shearwater’s warranty follows the unit rather than the original buyer, and its service culture is the standing benchmark in the industry (out-of-warranty repairs done free, loaners shipped abroad), which matters more for a safety instrument than any spec line.4
Mares Puck 4
Mares Puck 4
The honest cheap computer — the same Bühlmann-with-GF math as the expensive ones, a user-replaceable battery, and a ~$390 price.
Check pricePros
- Pro: Bühlmann ZHL-16C with gradient factors
- Pro: Coin cell you swap anywhere
- Pro: Bluetooth log sync
- Pro: Slim watch-style body
Cons
- Con: Segment display, not color
- Con: One-button menus mean more clicking
The honest budget pick at about $390. One button, a clean segment display, Bluetooth log sync, and, the part that matters, the same Bühlmann ZHL-16C with gradient factors the expensive computers run, in a package whose coin cell you replace yourself anywhere on earth. What you give up against the Peregrine is the big color screen and some interface grace; one-button menus mean more clicking. What you don’t give up is the math keeping you out of trouble.
The color-screen alternative in this bracket is the Aqualung i330R, a ScubaLab budget favorite at $349 with a bright display and rechargeable battery5 — worth buying if you find it in stock, but its availability has been patchy enough that the reliable recommendation at this price is the Mares.
Shearwater Peregrine TX
Shearwater Peregrine TX
The Peregrine plus air integration and a compass — the buy-once computer for divers who already know they're staying in the sport.
Check pricePros
- Pro: Everything the Peregrine does
- Pro: Air integration for up to four transmitters
- Pro: Digital compass
Cons
- Con: Transmitter adds ~$300–350
- Con: Overkill for a first season
The Peregrine with the two things its little brother lacks: air integration (up to four transmitters) and a digital compass, at about $700 plus roughly $300–350 for the transmitter. This is the buy-once computer: everything that makes the Peregrine right for a beginner, plus the gas-planning data that becomes genuinely useful once you dive enough to care about surface-air-consumption rates. If you already know diving is your sport and you’d rather not buy twice, start here and add the transmitter when the wrist unit stops feeling new.
Garmin Descent G2
Garmin Descent G2
A real Bühlmann dive computer inside a 46 mm AMOLED sports watch — the one-device answer for divers who are also runners.
Check pricePros
- Pro: Full dive computer and full sports watch
- Pro: AMOLED display
- Pro: Garmin fitness ecosystem
Cons
- Con: Air integration locks you into Garmin transceivers
- Con: Costs Peregrine TX money
The answer to a different question: not “which dive computer” but “which watch do I wear every day that also handles my diving.” The G2 is a real Bühlmann dive computer in a 46 mm AMOLED sports watch, with the whole Garmin fitness stack around it: sleep, runs, a dive-readiness score of debatable science but real charm.6 At $699.99 it costs Peregrine-TX money; air integration requires Garmin’s own transceiver and locks you into their ecosystem, which is the trade Garmin always offers. For the diver who is also a runner, it replaces two devices well.
The rest of the field
The premium tier is where preference takes over from advice. The Shearwater Teric remains the divers-first luxury watch (AMOLED, audible and vibration alarms, trimix-ready) at around $1,100, though Shearwater’s own Tern TX now undercuts it with air integration at about $795. The Suunto Ocean at $799 is the comeback story: a genuinely handsome GPS sports watch that marks Suunto’s move to Bühlmann. The Garmin Descent Mk3i at $1,399.99 adds sonar diver-to-diver messaging, a solution to a problem hand signals solved for free.
Below the fold: the Garmin Descent G1 Solar ($649.99) is the G2’s tougher, dimmer sibling with solar trickle-charging; the Cressi Neon is Cressi’s current entry watch, made in Italy, still on RGBM-derived math; and the Oceanic Geo Air bundles the cheapest path to air integration at $650 with transmitter. The old Cressi Donatello soldiers on, but at its current $429.95 list it is outclassed by everything above.
How to choose, in three decisions
Battery. Rechargeable (Peregrine, G2, i330R) means a dock or cable in your kit and a charge routine; coin cell (Puck 4) means a yearly swap and nothing to forget. Travel-heavy divers should think honestly about which they’ll fail at.
Air integration. Skip it on computer one unless you buy the TX path deliberately. The transmitter’s ~$300–350 buys no safety a gauge doesn’t already provide; it buys data you will care about later, if you keep diving.
Algorithm. Insist on Bühlmann with gradient factors; every card here has it. It is predictable, adjustable, and the computer will tell you why it wants what it wants, which is exactly the relationship you want with a safety instrument.
Dive computer FAQ
Frequently asked questions
Should a beginner get a rechargeable or coin-battery dive computer?
For home diving, rechargeable is painless. For remote travel, think about it: the Peregrine's charge lasts about 30 hours of diving, but a forgotten charging dock in a place without one ends your trip's logging. Coin-cell computers like the Puck 4 run for a season and swap batteries anywhere. Neither is wrong; know which failure you'd rather manage.
Do I need air integration on my first dive computer?
No. Air integration repeats your tank pressure on your wrist; your gauge already shows it. It adds roughly $300–350 in transmitter cost and one more battery to manage. Worth it later for gas-planning data — which is why the Peregrine TX exists — but no beginner dive is improved by it. Spend the difference on dives.
What are gradient factors, and should a new diver care?
Gradient factors tune how conservative a Bühlmann-algorithm computer is — lower numbers keep you further from the no-decompression limit. You don't need to touch them: every computer here ships with sensible defaults. What matters is that a GF computer tells you what it is doing, instead of locking you out on opaque penalty logic the way older proprietary algorithms did.
Can an Apple Watch or Garmin replace a dedicated dive computer?
A Garmin Descent genuinely is a dive computer with a watch attached, so yes. An Apple Watch Ultra running Oceanic+ is a real Bühlmann computer too, but it stops at 40 meters, has no air-integration path, and bills a subscription. Fine as a second computer or for guided warm-water trips; a progressing diver outgrows it.
Resources
Footnotes
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Suunto dive computer depth-sensor class-action settlement, models manufactured 2006–Aug 2018, topclassactions.com. ↩
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Suunto Ocean announcement and the move to Bühlmann 16 GF, June 2024, divemagazine.com. ↩
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Consensus first-computer rankings, DiveIn best beginner computers 2026 and Bluewater’s 2026 guide. ↩
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Shearwater service record and unit-following warranty, ScubaBoard, service thread and authorized-retailer thread. ↩
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Aqualung i330R, ScubaLab Testers Choice under $450, scubadiving.com. ↩
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Garmin Descent G2 announcement, February 2025, garmin.com. ↩
Liz Meyer — Travel writer
Liz is a full-time traveler and a PADI Rescue Diver. She loves to explore new places in and out of the water and share her experiences with others.
