Garmin Dive Computers

Garmin Dive Computers — The Descent Series

Garmin entered the dive computer market with a clear ambition: build the most technically capable wrist dive computer on the market, combining professional-grade underwater instrumentation with the full-featured smartwatch platform divers wear every day. The result is the Descent series — a lineup that now spans accessible entry-level models through the most advanced wrist dive computers ever made, including the world's first dive computers with SubWave sonar diver-to-diver communication technology.

What makes Garmin's approach distinctive is the depth of integration between diving and life on the surface. A Descent Mk3i isn't a dive computer that also tells time — it's a full Garmin smartwatch platform that also happens to be the most capable dive computer available, with Firstbeat Analytics powering metrics like Diver Readiness (which evaluates your physical state before a dive based on sleep, recovery, and body battery), VO2 Max, training load, and recovery time. The result is a device that's genuinely useful on the 350 days a year you're not diving, and exceptional on the days you are.

At DiveCatalog.com, we carry the full current Descent lineup, Descent T2 transceivers, QuickFit watch bands, and the Descent S1 Communication Buoy as an authorized Garmin dealer.

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The Descent Lineup

Descent G1 Solar — The Entry Point

The Descent G1 Solar is the most accessible entry into Garmin's dive computer ecosystem — a multisport GPS smartwatch with solar charging capability and a full dive computer built in. Available in Standard (no solar) and Solar editions, and in multiple colorways including the Ocean Edition Azure. Multiple dive modes cover single-gas and multi-gas recreational profiles, gauge mode, freediving, and apnea. Garmin Connect integration syncs dive logs wirelessly. Solar charging extends battery between charges without requiring daily cable charging — practical for liveaboard and expedition use. The right choice for recreational divers who want Garmin dive logging and a capable everyday smartwatch at the most accessible entry point.

Descent G2 — AMOLED Entry (Launched February 2025)

The Descent G2 is Garmin's current AMOLED entry-level dive computer, launched February 2025. It brings a vivid AMOLED display, GPS surface navigation, multi-gas support, and full smartwatch functionality in a clean, wearable profile. Available in Black and Paloma (light colorway). The G2 is the step up from the G1 for divers who want a better display and more capable GPS without the SubWave and air integration of the Mk3i. An excellent choice for advanced recreational divers who want a capable connected dive computer with smartwatch versatility.

Descent Mk3 — Advanced Wrist Computer (43mm, No Air Integration)

The Descent Mk3 is the non-air-integration version in the Mk3 family — available only in 43mm, with the same AMOLED 454×454 touchscreen display, the same dive modes, and the same Firstbeat Analytics smartwatch features as the Mk3i. Key distinction: the Mk3 is not compatible with T2 transceivers and does not include SubWave sonar communication. If air integration and diver-to-diver messaging are not priorities, the Mk3 offers the Mk3i's dive and fitness experience at a more accessible price in the 43mm form factor. Includes Diver Readiness, Red-Shift/Night Vision display mode, and the full Garmin fitness and health platform.

Descent Mk3i — The Flagship Dive Computer (43mm and 51mm)

The Descent Mk3i is Garmin's most technically advanced wrist dive computer and the benchmark in the dive industry. The flagship features:

SubWave Sonar Diver-to-Diver Communication: Send and receive preset messages (Are You OK?, Come to Me, Safely End Dive, and more) between connected divers up to 30 meters away. Up to 8 divers in a SubWave network. Requires T2 transceivers (sold separately).

Air Integration via T2 Transceivers: Monitor tank pressure and depth for up to 8 cylinders simultaneously within 10 meters. T2 transceivers attach to cylinder valve HP ports and communicate wirelessly via SubWave.

CCR Compatible: Closed-circuit rebreather dive mode for technical rebreather divers.

Diver Readiness: Powered by Firstbeat Analytics — evaluates sleep score, body battery, training load, stress, dive history, and recovery to give a concrete readiness score before each dive day.

AMOLED 454×454 Display: A 25-day battery life (a 50% improvement over the Mk2i), AMOLED touchscreen with Red-Shift mode for night vision preservation and Night Vision mode for NVG compatibility.

Full Smartwatch Platform: 100+ sport modes, Garmin Connect health metrics, Garmin Pay, music storage, and all Firstbeat health analytics including VO2 Max, Body Battery, sleep score, and HRV status.

Available in 43mm (Bronze PVD Titanium/French Gray or Carbon Gray DLC Titanium/Black) and 51mm (Carbon Gray DLC Titanium/Black or DLC Titanium band). Also available bundled with a Descent T2 Transceiver for a complete air integration setup.

Descent Mk2i — Previous Generation

The Descent Mk2i remains available in titanium Carbon Gray DLC configuration. While superseded by the Mk3i in display, battery, and SubWave capabilities, the Mk2i is a proven platform that continues to offer full air integration (via T1 transceivers) and complete smartwatch functionality. A practical option if budget is a primary consideration.

Descent X30 — Mid-Format Dive Computer (Launched September 2025)

The Descent X30 is Garmin's mid-format dive computer — a 2.4" color screen form factor that sits between the wristwatch Descent models and the larger X50i. SubWave sonar capability. Full dive modes. A strong option for divers who want a larger display than a wrist watch but a more manageable size than the X50i's 3" screen.

Descent X50i — Large-Format Premium Dive Computer (Launched November 2024)

The Descent X50i was Garmin's first large-format dive computer — and it's genuinely different in kind from the wristwatch Descent models. Key specs: 3" color touchscreen display (surface operation only), 20 ATM / 200-meter depth rating, leakproof metal buttons, integrated backup dive light, SubWave sonar for diver-to-diver messaging and T2 air integration, DiveView maps with bathymetric contours for 4,000+ dive sites, Projected Ascent data field for decompression planning visualization, in-dive depth chart and real-time history, tide data, 3D dive compass, and 60-hour battery life. Wrist-mounted via dual elastic arrowhead-buckle straps. The choice for technical divers who want the largest, most readable display available.

Descent S1 Communication Buoy

The Descent S1 is a surface communication buoy that integrates with the Garmin SubWave sonar network. It extends SubWave connectivity from underwater to the surface — allowing dive operations on the surface (dive boats, shore support) to communicate with divers below using the SubWave network. A professional-grade safety and operations tool for commercial and technical dive teams.

Descent T2 Transceiver

The Descent T2 is the current generation wireless tank monitoring transmitter, enabling SubWave air integration on compatible Descent and Fenix devices. Attaches to the HP port of a cylinder valve and transmits tank pressure and depth data wirelessly via SubWave sonar to up to 8 paired devices simultaneously. Also enables diver-to-diver messaging when paired with T2-compatible devices. The T1 is the previous generation and does not enable messaging, only tank pressure monitoring.

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Choosing the Right Descent

Diver Type	Recommended Model	Key Reason
Recreational entry — first Garmin dive computer	Descent G1 Solar or G2	Accessible; dive logging; GPS; solar charging (G1) or AMOLED (G2)
Advanced recreational — no air integration needed	Descent Mk3 (43mm)	AMOLED; Diver Readiness; full smartwatch; no T2 required
Technical / dive professional — air integration	Descent Mk3i (43mm or 51mm)	SubWave; T2 air integration; 8 tanks; CCR; 25-day battery
Divers preferring a large display	Descent X50i or X30	3" or 2.4" color screen; SubWave; DiveView maps; integrated dive light (X50i)
Dive operations / boat support	Descent S1 Communication Buoy	Surface SubWave networking for dive team operations
Divers who also train heavily in other sports	Garmin Fenix 8	Full dive computer + flagship multisport + maps + SubWave + adventure features

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SubWave Air Integration — What You Need

To enable wireless air integration and diver-to-diver messaging on a compatible Descent:

1. You need a Descent Mk3i (not Mk3), X50i, X30, or compatible Fenix 8.

2. You need one or more Descent T2 Transceivers (sold separately) — one per cylinder you want to monitor.

3. T2 transceivers attach to the HP port of each cylinder valve.

4. Once paired, the watch displays tank pressure, remaining gas time, and depth for each connected cylinder.

5. Diver-to-diver messaging works when two or more T2-equipped Descent Mk3i/X50i/X30/Fenix 8 devices are in the SubWave network (up to 8 total).

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Why Buy Garmin Dive Computers from DiveCatalog.com?

• Authorized Garmin dealer — genuine products, full manufacturer warranty
• Dive computer expertise — our team dives and can guide you through the Descent lineup
• T2 transceivers available — complete your air integration setup in one order
• QuickFit watch bands available — customize your Descent with silicone, leather, or woven bands
• Fast shipping — in-stock items ship within one business day
• Financing available — for Mk3i and X50i premium systems
• Rewards program — earn points on every purchase

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Frequently Asked Questions — Garmin Dive Computers

What is the difference between the Descent Mk3 and Mk3i?

The Mk3 (43mm only) and Mk3i (43mm and 51mm) share the same AMOLED display, dive modes, Diver Readiness, and fitness smartwatch features. The Mk3i adds SubWave sonar diver-to-diver messaging, compatibility with Descent T2 transceivers for wireless air integration, and CCR (closed-circuit rebreather) dive mode. The Mk3 is not compatible with T2 transceivers and cannot do air integration or diver-to-diver messaging.

Does the Descent X50i's touchscreen work underwater?

No — the 3" touchscreen on the Descent X50i operates on the surface only. Underwater operation uses the physical leakproof metal buttons. This is noted in the product specifications.

Can I use T1 transceivers with the Descent Mk3i?

Yes, T1 transceivers work with the Mk3i for tank pressure monitoring. However, T1 transceivers do not support the diver-to-diver messaging function — that requires T2 transceivers.

What is Diver Readiness?

A Garmin-exclusive pre-dive readiness score (available on Mk3, Mk3i, X50i, and Fenix 8) powered by Firstbeat Analytics. It combines sleep score, body battery, HRV, stress level, dive history, and training load into a concrete readiness indicator before each dive day. Higher scores indicate better physical preparation for demanding dive profiles.

Does the Descent Mk3i work as a fitness watch when not diving?

Yes — the Mk3i is a full Garmin smartwatch with 100+ sport modes, Garmin Pay, music storage, Body Battery, sleep tracking, stress monitoring, VO2 Max, and all Firstbeat health analytics. Many owners use it as their primary everyday watch.

What subscription is required for inReach connectivity?

Garmin inReach satellite communicators (separate from dive computers) require a Garmin inReach subscription plan for two-way messaging and SOS capabilities. Dive computers themselves don't require subscriptions — they communicate with the Garmin Connect app via Bluetooth at no charge.

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Browse the full Garmin dive computer collection above. Whether you're buying your first Garmin dive computer or upgrading to the Descent Mk3i or X50i, our team can help you choose the right model and configure air integration. Reach out anytime.