More and more scuba divers are choosing a watch sized diving computer as improving technology allows more powerful and varied functionality to be squeezed into dive instruments that can be worn day-to-day.
Diving computers tend to be a big investment, so it’s critical that you have the right information to choose the best option for your needs as a diver. In this article, I will give you the details and specifications needed to make the best-informed choice.
What are the different types of watch sized diving computers?
There are two categories of watch sized diving computers:
Smart watch
Basic watch
Some computers offer a huge range of smart functionality; everything you might expect to find on a latest generation watch, including:
GPS
Heart rate monitors
Blood oxygen sensors
Music players
Bluetooth connection for linking wireless headphones, smartphones and internet music streaming services.
Other models have nothing more than basic watch functionality on dry land.
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What dive functionality do watch sized diving computers have?
In terms of dive functionality, there can be big differences in watch sized diving computers. High end models offer all the functionality necessary for trimix technical and CCR diving.
More economical models are restricted to recreational diving, without options for helium or multiple gas mixtures.
Different decompression models
A majority of watch sized diving computers use the Bühlmann ZH-L16 algorithm to plan and conduct dives. This is the most popular decompression model with higher-level divers; especially those doing technical dives.
Some manufacturers use proprietary models that may be more conservative or adaptive on the dive – which makes them unpredictable for tech diving.
Air integration (AI)
The other big difference in functionality amongst watch sized diving computers is whether they utlize air integration (AI) or not.
The use of transmitters to monitor gas supplies and predict remaining gas consumption time is becoming very popular in the dive community.
Some AI-capable computers permit just one transmitter, while others can link with multiple transmitters; making them attractive to sidemount or technical divers.
How much do watch sized diving computers cost?
The cost for a watch sized diving computer ranges from $299 to well over $1500. The price typically reflects the level of funtionality provided by the computer, along with the materials used in construction. Smart watches cost more than basic watches.
High-end watch sized dive computers
Computers manufactured from titanium or stainless steel tend to cost more than those made from Delrin and other composites. Likewise, screen material has a cost effect. Some are plastic, whilst others are mineral glass or sapphire crystal; which are increasingly more scratch resistant and durable.
Air integration costs more
If you are seeking air-integration functionality, do remember that you’ll also have to budget for the cost of the transmitters. These are typically sold separately by manufacturers; with prices usually starting at ~$500.
What are the best watch sized diving computers?
Here’s my list of the best watch sized diving computers currently on the market. Use the information provided to decide which computer best suits your individual diving needs and financial budget.
Shearwater Teric *best for tech diving
Garmin Descent Mk2 *best smartwatch
Garmin Descent G1 Solar *best mid-range
Deep6 Excursion *best economy range
Garmin Descent Mk1
Ratio iDive Color Tech+
Suunto D5
Aqualung i470TC
Suunto D41 Novo
Suunto DX Titanium
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Best Watch Sized Diving Computer For Technical Diving
Shearwater Teric
Algorithm: Bühlmann ZH-L16 with Gradient Factors
PC Link: Bluetooth Smart LE
No. Gasses: 5 + CCR mode
Air Integration: 4 transmitters
Depth Rating: 200m
Screen Type: 1.39″(400 x 400 pixel) Full Color AMOLED
Strap: Silicon 22mm standard, with multiple color options available
Materials: Ballistic nylon polymer case and 316 Stainless bezel/buttons with sapphire crystal screen
Compass: 3D digital compass
Price: ~$1150
The Teric has open-circuit recreational, open-circuit technical, CCR, gauge and freediving modes.
You can connect up to four AI transmitters for wireless gas tracking and the screen display is vibrant and easy to view, even in bright conditions with a lot of glare.
Shearwater are incredibly popular
Shearwater energized the market with its release of the Teric in 2018. It’s been a firm favorite of many divers ever since. This watch sized diving computer squeezes in all of the functionality and firmware that you’d be accustomed to seeing on Shearwater’s full-size models, like the Petrel, Perdix and Peregrine. I know numerous technical divers who use it as either primary or backup computer for serious decompression diving.
A more dedicated diving instrument than Garmin
Whilst the Teric doesn’t have the vast suite of sports and outdoors features offered by its competitor, the Garmin Descent (see below), it is significantly more functional as a dedicated recreational and technical diving computer; especially in regards to the in-water information supply; such as the GF99, GFSurf, tissue compartment graphs displays. As a technical diving instructor, I find that detailed information indispendible on my dives; and it has safety benefits in respect to on-the-fly decision making.
It’s worth noting that Shearwater has an exceptional reputation amongst the dive community for their customer service. This factor alone is why many divers choose to invest in their computers.
Best Watch Sized Diving Computer For Non-Diving Functions
Garmin Descent 51mm Mk3i
Algorithm: Bühlmann ZH-L16c with Gradient Factors
PC Link: Bluetooth® Smart, ANT+®, Wi-Fi®
No. Gasses: 11 + CCR mode
Air Integration: 8 transmitters
Depth Rating: 200m
Screen Type: 1.4” (454 x 454 pixels) AMOLED colour
Battery: Rechargeable Li-Ion with proprietary clip charger: 25 days in smartwatch mode, 66 hours in dive mode (40 hours for Mk2i using transmitters), and 55 hours in GPS mode.
Strap: 22mm QUICKFIT™ Silicone
Materials: Fiber-reinforced polymer case with titanium rear cover and diamond-like carbon (DLC) coated titanium and scratch-resistant sapphire crystal screen
Compass: 3D digital compass
Price: $1599 (51mm Mk3i)
Garmin released two new models of the Descent Mk3 in November 2023: the Mk3 and Mk3i (air integration). The Garmin Descent Mk3i model is available in two sizes, a smaller 43mm or a large 51mm. The larger size watch offers more functionality, a significantly larger screen, and much longer battery life. Additionally, the 51mm Mk3 has a built-in LED light, with strobe function, for emergencies.
In addition to all of the functionality offered on the older Mk2 (see below), the new 51mm Mk3i has a larger screen with much higher resolution and allows up to 8x T2 transmitters to be connected. This can allow inter-diver monitoring and can also enable preset diver-to-diver messaging (Subwave Sonar Messaging).
Technical divers may appreciate the improved depth rating of the Mk3, with 200m of pressure resistance, rather than the 100m of the Mk2.
New software apps on the M3i include a ‘Dive Readiness Tool‘ which monitors your biodata pre-diving to suggest DCS susceptibility, and ‘DiveView Maps‘ showing depth contours for over 4000 dive sites around the world.
Garmin Descent 43mm Mk3 and M3i
Algorithm: Bühlmann ZH-L16c with Gradient Factors
PC Link: Bluetooth® Smart, ANT+®, Wi-Fi®
No. Gasses: 11 + CCR mode
Air Integration: 8 transmitters (Mk3i only)
Depth Rating: 200m
Screen Type: 1.2” (390 x 390 pixels) AMOLED colour
Battery: Rechargeable Li-Ion with proprietary clip charger: up to 12 days in battery-saver watch mode, 10 days in smartwatch mode, 30 hours in dive mode (15 hours for Mk2i using transmitters) and 20 hours in GPS mode.
Strap: 22mm QUICKFIT™ Silicone
Materials:
Mk3: Fiber-reinforced polymer case with a stainless steel bezel and sapphire crystal screen.
Mk3i: Fiber-reinforced polymer with titanium rear cover, Diamond-like Carbon (DLC) coated titanium or bronze PVD coated titanium bezel, and sapphire crystal screen.
Compass: 3D digital compass
Price: $1399 (43mm Mk3i) and $1199 (43mm Mk3)
There are two models available in the 43mm size; with air-integration (Mk3i) and without (Mk3).
The Garmin Descent 43mm Mk3 is slightly smaller than the older Mk2 (43x43x14.15mm versus 52x52x17.8mm), which may be desirable for smaller divers. However, it also has a smaller screen size (1.2″ vs 1.4″) which some may find less easy to read.
The disadvantage of a smaller screen size is somewhat balanced by a significantly higher resolution compared to the Mk2 (390x390px versus 280x280px).
One of the biggest drawbacks of the 43mm version of the Mk3 is its shorter battery life compared to the 51mm model. You will need to recharge far more frequently. Additionally, the small version of the Descent Mk3 does not feature an in-built LED emergency light.
Battery: Rechargeable Li-Ion with proprietary clip charger: up to 50 days in battery-saver watch mode, 16 days in smartwatch mode, 80 hours in dive mode (32 hours for Mk2i using transmitters) and 24 hours in GPS mode.
Strap: 22mm QUICKFIT™ Silicone or Titanium (Mk2i)
Materials: Fiber-reinforced polymer case with a stainless steel (Mk2/Mk2S) or Titanium bezel (Mk2i) and scratch-resistant sapphire crystal screen
Compass: 3D digital compass
Price: Mk2 $1299/ Mk2i $1499 / Mk2S: $999
The Garmin Descent Mk2 is a full function trimix computer, with added functionality as a fully smartphone compatible (with smart notifications and controls) outdoors, fitness and sports watch.
Whilst the Teric is a dedicated technical diving computer with a lot of the excellent diving functionality you’d see in Shearwater’s full-size devices, the Garmin Descent Mk2 is much more of an all-round, watch sized diving computer.
The Garmin will appeal to those who also want the features of both a modern smart-watch and a highly capable sports/outdoors instrument; in addition to being an excellent dive instrument.
In dive mode it offers forty customizable alarms, has three conservatism settings plus custom settings for gradient factors, and has several safety stop options, including custom stop settings. It has a CCR diving mode.
The Descent Mk2 is available in black, light gold and mineral blue colors.
A vast array of sports and outdoors functions
It features a vast array of sensors, including; GPS, GLONASS, constant heart rate monitor, blood oxygen (spO2) sensor, barometric altimeter, compass, gyroscope, accelerometer and thermometer.
These allow specific multisport operating modes, which can be linked to the internet via a smartphone, for swimming, cycling, golf, fitness tracking, running, and outdoors (hiking/climbing, mountain biking, skiing, snowboarding, rowing, jumpmaster and tactical).
You can download digital maps onto the watch, for use with the abovementioned modes, and record the entry and end points of your dive using GPS/GLOSNASS/Galileo satellite systems.
It has a music player feature (2000 songs storage); you can link bluetooth headphones and connect to streaming apps, like Spotify. The Descent Mk2 is also smartphone compatible with Android and iPhone.
The Mk2S and Mk2i versions
Mk2S version: The Mk2s is smaller in size; 43mm compared to the other options which have a 52mm case size. It has a smaller screen diameter of 1.2″ (240 x 240 pixels) and weighs just over 100 grams/2oz (silicone band: 60 g/ case 41g). It is available in three color options.
Mk2i version: The Mk2i has air integration (AI) technology and links to Garmin’s T1 gas transmitters; this tracks your gas consumption and provides information on the remaining time available. It has functionality to pair with up to five different transmitters, which are sold separately. The watch has a Diamond-like Carbon (DLC) coated titanium bezel and option for a titanium metal strap. It weighs silicone band: 99.6 g with a silicon band and 160.3g with the titanium band.
Additional apps can be installed via Garmin’s online store.
Screen Type: two-window design: 0.9” x 0.9” (176 x 176 pixel) monochrome sunlight-visible, transflective memory-in-pixel (MIP)
Battery: Rechargeable Li-Ion with proprietary clip charger: unlimited with solar watch mode, 4 months in smartwatch mode, 25 hours in dive mode and 26 hours in GPS mode. Solar charging, assuming all-day wear with 3 hours per day outside in 50,000 lux conditions
Strap: QUICKFIT™ Silicone (22 mm)
Materials: Fiber-reinforced polymer case and bezel, with ‘Power Sapphire’ screen
Compass: 3D digital compass
Price: ~$650
The Garmin G1 solar has all of the functionality of the Mk2, but offers solar recharging. This dramatically extends the amount of time between necessary charging. The computer has a smaller screen size and a monochrome display. It is available in black and hurricane blue colors. The G1 Solar is the only solar powered watch sized diving computer on the market.
Additional apps can be installed via Garmin’s online store.
Battery: Rechargeable Lithium with clip-style charging. 25 hours with backlight active in dive mode and 3 months in standby watch mode
Strap: Nylon (NATO-style)
Materials: 316 Stainless Steel case and bezel with K1 tempered glass screen
Compass: none
Price: $299
BEST BUDGET BUY. The Deep6 Excursion isn’t comparable with watch sized diving computers like the Shearwater and Garmin, but it only costs a fraction of the price and provides everything the average recreational diver needs.
It has air, nitrox, gauge and apnea/free-diving modes, It doesn’t have custom gradient factors, but there are three conservatism settings, based upon GF 35/75, 40/85, 45/95.
Battery: Rechargeable Li-Ion docking type: up to 19 days in watch mode, 10 days in smartwatch mode, 40 hours in dive mode and 20 hours in GPS mode4
Strap: Silicone or Titanium
Materials: Fiber-reinforced polymer case with a stainless steel or Titanium bezel and scratch-resistant sapphire crystal screen
Compass: 3D digital compass
Price: ~$999 (expect to pay ~$700 pre-owned)
The Garmin Descent Mk1 was superseded by the Mk2, but they are still being sold by some retailers and many are becoming available on the second-hand market as divers upgrade to newer versions.
Despite not being Garmin’s latest model, the Mk1 remains very competitive against other watch sized dive computers on the market.
The Mk1 is also a full function trimix computer, with added functionality as a fully smartphone compatible (with smart notifications and controls) outdoors, fitness and sports watch.
Additional apps can be installed via Garmin’s online store.
Algorithm: Bühlmann ZH-L16B w/GF and VPM-B (switchable)
PC Link: USB
No. Gasses: 10 (Air, Nitrox, Trimix, CCR)
Air Integration: 10 transmitters (+ auto-switch sidemount mode)
Depth Rating: 220mt / 721ft
Screen Type: TFT LED w/IPS, 1.3″ (240×240 pixel) 261 ppi
Battery: USB rechargeable Li-Ion (25 hours in dive mode)
Straps: Polymer (multiple color options available)
Materials: Sapphire Crystal screen with Stainless steel bezel and case.
Compass: 3D digital compass
Price: ~$999
The iDive Color Tech+ is the new 2019 flagship of Ratio’s watch sized diving computer range. It is programmed for full trimix capability and comes with many of the features you’d find on their full-sized iX3M range.
In terms of price, it is competitive with the Suunto D5 and Garmin Mk2S, Mk1 and G1 Solar computers.
The top-of-the-range Color Tech+ comes with a sapphire crystal screen. This material is second only to diamond with respect to hardness and scratch-resistance and improves the depth rating of the Tech+ to 220m compared to the Easy and Deep variants which have mineral glass screens.
An atypical choice of decompression model
As with the iX3M, the iDive Color Tech+ opts for the Bühlmann ZHL-16B algorithm; which was originally designed to produce dive tables, unlike the ‘C’ version which is intended for implementation on dive computers. The Ratio will be less conservative than other computers using Buhlmann version C.
You’ll find it has all the standard Ratio gadgets: magnetometer, luxmeter, altimeter, moon calendar, chronometer, pitch/roll display, weather forecast and barometer. It also features an (optional) USB plug-in O2 analyser and has integral gas-blending software installed.
Fancy color-coded LED transmitters
The unit is wireless air integration and illuminating colour-coded transmitters can be purchased. The illuminating transmitter LEDs are also color-coded to warn of gas pressure; Green = 100+ bar / Yellow = 50-100 bar / Red = 0-50 bar. The tech community generally hasn’t adopted air-integration yet, so I doubt this would be a valuable functionality for many buying the Color Tech+. Also, for cave and wreck divers, all those sparkly transmitter LEDs are liable to be distracting in dark environments.
More affordable models are available
Ratio also offers more economical models, restricted for nitrox or normoxic trimix diving only:
iDive Color Easy – 2 gasses (air/nitrox), 6x Bühlmann ZHL-16B pre-set (not user definable)
iDive Color Deep – 3 mixes (air/nitrox/normoxic trimix), 6x Bühlmann ZHL-16B pre-sets (not user definable) and 6x VPM-B pre-sets.
Recreational divers can set their own preferences for deep stops (standard or Pyle method) and can manually input/designate what method of safety stops they want to complete.
Screen Type: LED (320×300 pixel) memory in pixel (MIP)
Battery: rechargeable lithium-ion. 6-12 hours in dive mode and 6 days in watch mode
Mounting: silicon (24mm), multiple color options and NATO-style strap is available
Materials: Reinforced composite case, stainless steel bezel and mineral glass screen
Compass: yes
Price: ~$914
Suunto dive computers are very popular in the recreational dive community. The D5 watch sized diving computer has a modern full-color screen, a rechargeable battery, and offers air integration with one transmitter.
The D5 competes with the Ratio iDive Color Tech+ and Garmin Mk25S in terms of price.
It used Suunto’s latest proprietary algorithm, Fused RGBM-2, which is designed to cater for deeper technical dives and CCR diving.
Suunto claims the algorithm is less conservative and more tolerant of repetitive diving than their standard RGBM algorithm; which makes this watch sized diving computer more appealing to experienced divers.
Algorithm: proprietary Z+ (with deep stops) based upon Bühlmann ZHL-16c
PC Link: Bluetooth and USB
No. Gasses: 3
Air Integration: 3 transmitters
Depth Rating: 120m
Mounting: silicon, multiple color options
Materials: Reinforced composite case, stainless steel bezel and mineral glass screen
Screen Type: no details given by the manufacturer
Battery: User-changeable standard CR2430 lithium watch battery
Mounting: silicon
Materials: no details given by the manufacturer (appears nylon with glass screen)
Compass: none
Price: $525
The Aqualung i470TC appears old generation in terms of its screen display; and Aqualung cleverly omit to mention any details of the screen resolution or case/bezel/screen materials. It is a glaring omission and seems disingenuous. Divers looking to invest in a watch sized diving computer need manufacturers to supply them with full details for comparisons.
The screen display may appeal to divers who prefer a retro ’80s style digital watch style. In my own inspection, it seems to be a nylon-type case with a glass screen. They provide a plastic screen protector in the box.
The i470TC is the only economy range (~$500) watch sized dive computer that offers air integration (AI) capability with more than one transmitter. The algorithm is based upon Bühlmann ZHL-16C, but has been modified to enable deep stop functionality.
Diver reports suggest that the algorithm tends to be conservative; which makes it ideal for novice divers. I personally don’t like proprietary algorithms on my dive instruments; as they aren’t transparent about how they perform.
Screen Type: LCD matrix (49×22 pixel) with electro-luminescent backlight
Battery: CR2450 watch battery
Mounting: silicon (24mm), multiple color options and NATO-style strap is available
Materials: Reinforced composite case, stainless steel bezel and mineral glass screen
Compass: yes
Price: $499
Lower in Suunto’s watch sized diving computer range is the D4i Novo. It’s just cheaper than the Aqualung i1470TC on price, but nearly $200 more expensive than a Deep6 Excursion (which doesn’t have air integration).
The D4i offers acceptable functionality for a watch sized diving computer, but suffers from an antiquated low-resolution LCD matrix screen and not having a rechargeable battery.
Offering just one gas mix, the D4i is firmly a recreational diving computer.
Many divers will attest that the RGBM algorithm is exceptionally conservative; especially on repetitive and multi-day diving; which can be a very positive feature for new divers, but may frustrate those who have built up the experience to know their own tolerances and plan their diving prudently.
Screen Type: LCD matrix (49×22 pixel) with electro-luminescent backlight
Battery: CR2450 watch battery
Strap: Titanium
Materials: Titanium case and bezel with sapphire crystal screen
Compass: yes
Price: ~$1600
The Suunto DX Titanium is priced at the top of the premium range for a watch sized diving computer, which is shocking because it only offers a LCD matrix screen and a replaceable battery. It has no smartwatch functions, which may make it unattractive compared to similarly priced competitors that seem two generations above in technology.
The main selling feature of this computer is the all-titanium construction and sapphire crystal screen. The Fused RGBM algorithm combines recreational and technical decompression models, switching between the two depending on the dive parameters.
The algorithm is conservative compared to the newer RGBM-2 on the D5 computer. Despite offering trimix, decompression gasses and CCR functionality, the choice of algorithm is liable to make this unpopular with many experienced technical and rebreather divers.
Andy Davis is a RAID, PADI TecRec, ANDI, BSAC, and SSI-qualified independent technical diving instructor who specializes in teaching sidemount, trimix, and advanced wreck diving courses.
Currently residing in Subic Bay, Philippines; he has amassed more than 10,000 open-circuit and CCR dives over three decades of challenging diving across the globe.
Andy has published numerous diving magazine articles and designed advanced certification courses for several dive training agencies, He regularly tests and reviews new dive gear for scuba equipment manufacturers. Andy is currently writing a series of advanced diving books and creating a range of tech diving clothing and accessories.
Prior to becoming a professional technical diving educator in 2006, Andy was a commissioned officer in the Royal Air Force and has served in Iraq, Afghanistan, Belize, and Cyprus.
There are a number of watch-sized dive computers that can be worn as day-to-day timepieces. Some are smart watches with extensive sports, outdoors, and fitness functions.
What is the best dive computer brand for watch sized?
Best all-around watch computer: Shearwater Teric Top value for money computer: Garmin G1 Solar Best economy watch computer: Deep6 Excursion
Which smartwatch is best for diving?
The best all-around smartwatch for use as a diving computer is the Garmin Descent Mk2. However, the Garmin G1 Solar represents the best value for money.
Can you use a Garmin watch as a dive computer?
The Garmin Descent Mk2 and G1 Solar models are both fully-functioning dive computers.
What is the smallest dive computer?
There are many watch-sized dive computers on the market. The Garmin G1 Solar is currently the smallest, with a screen size of less than 1″x1″.
Is there a smart dive watch?
The Garmin Descent Mk2 and G1 Solar are both highly capable smart watches & fully functional diving computers.
What is the difference between the Garmin Descent and Shearwater Teric?
Both are fully functional diving computers that use Bühlmann ZHL-16c model. The Teric has more diving functionality, whereas the Descent Mk2 has more sports and smartwatch capability.
A Simple Guide To Dive Computer Algorithms Not all dive computer algorithms are created equal. Learn the differences and make an informed decision when buying your next dive computer.
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