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Garmin

Garmin Descent Mk3i 51mm Dive Computer

$2,299.98
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Color: Carbon Gray/Titanium

FREE 2-day delivery is available on this item

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Limited Warranty 2 year coverage Limited
Warranty 2
Year Coverage

Description



Dive deeper and explore the underwater world like never before with the Garmin Descent Mk3i! This advanced watch-style dive computer allows you to achieve new depths with confidence, featuring a stunning 1.4" AMOLED display that's designed to dazzle even in bright sunlight. The super tough titanium bezel and sapphire lens ensure durability, while the 200-meter dive-rated case guarantees you can take it on all your aquatic adventures.

With its innovative SubWave sonar technology, stay connected with fellow divers by sending messages up to 30 meters away! Plus, monitor tank pressures and depth for up to eight divers when paired with the Descent T2 transceiver, enhancing your group diving support. Whether you're scuba diving or freediving, the multiple dive modes cater to all your underwater needs. Navigate seamlessly with the built-in underwater compass, and enjoy your dive without worrying about swimming in the wrong direction!

Illuminate your underwater escapades with the built-in LED flashlight, which boasts variable intensities and strobe modes for optimum visibility. The integrated dive readiness tool offers insights based on your lifestyle factorshelping you dive smarter. Ready to explore over 4,000 dive sites? The DiveView maps have got you covered. Join a community of divers and share your adventures with the Garmin Dive app. Experience a dive computer thats more than just a piece of equipment; its your guide to underwater freedom!

What's Included?

  • Garmin Descent Mk3i 51mm Dive Computer
  • Silicone wrist band
  • Charging cable

Your Dive, Our Priority

Get support from passionate diving experts dedicated to going the extra mile for you.

  • Troubleshooting a product issue
  • Finding the right setup for your dive
  • Installing components
Live Chat

Dive Modes

Recreational Scuba

Recreational Scuba

With Buehlmann ZHL-16c algorithm, supporting single gas or multi-gas for NDL and decompression diving.

Apnea / Freedive Mode

Apnea / Freedive Mode

Dedicated apnea tracking with high-frequency depth and surface interval sampling, recording freediving sessions separately from scuba dives.

Technical Scuba

Technical Scuba

Nitrox and Trimix support, closed circuit rebreather (CCR), gas mixes (air, Nitrox, Trimix, up to 100% O2; 1 bottom gas & up to 11 deco and/or backup gases), PO2 up to 2.0 with customized deco PO2 setting.

Recreational Scuba

Recreational Scuba

With Buehlmann ZHL-16c algorithm, supporting single gas or multi-gas for NDL and decompression diving.

Apnea / Freedive Mode

Apnea / Freedive Mode

Dedicated apnea tracking with high-frequency depth and surface interval sampling, recording freediving sessions separately from scuba dives.

Technical Scuba

Technical Scuba

Nitrox and Trimix support, closed circuit rebreather (CCR), gas mixes (air, Nitrox, Trimix, up to 100% O2; 1 bottom gas & up to 11 deco and/or backup gases), PO2 up to 2.0 with customized deco PO2 setting.

Product Features

Product feature

Send text messages to fellow divers up to 30 meters underwater via SubWave sonar technology - a revolutionary underwater communication feature.

Product feature

Monitor tank pressures for up to 8 divers simultaneously when paired with Descent T2 transceivers - ideal for group diving and dive masters.

Product feature

Integrated variable-intensity LED flashlight with strobe mode provides illumination for night dives, low-visibility conditions, and underwater navigation.

Product feature

Proprietary Dive Readiness tool plus full smartwatch health: wrist heart rate, Body Battery, advanced sleep, and stress monitoring.

Product feature

Send text messages to fellow divers up to 30 meters underwater via SubWave sonar technology - a revolutionary underwater communication feature.

Product feature

Monitor tank pressures for up to 8 divers simultaneously when paired with Descent T2 transceivers - ideal for group diving and dive masters.

Product feature

Integrated variable-intensity LED flashlight with strobe mode provides illumination for night dives, low-visibility conditions, and underwater navigation.

Product feature

Proprietary Dive Readiness tool plus full smartwatch health: wrist heart rate, Body Battery, advanced sleep, and stress monitoring.

Product Details

Specifications

Algorithm: Buehlmann ZHL-16c

Dive Modes: Single Gas, Multi-Gas, Apnea/Freedive, Gauge, Nitrox, Trimix, CCR

Depth Rating: 200 m / 656 ft

Display: 1.4 inch AMOLED

Lens: Sapphire crystal

SubWave Sonar: Yes (messaging, 30 m)

Air Integration: Yes (T2 transceiver, up to 8 divers)

LED Flashlight: Yes (variable + strobe)

Dive Sites: 4,000+

Bathymetric Maps: Yes

Dive Readiness: Yes

Nitrox: Yes

Logbook: Yes

Bluetooth: Yes

ANT+: Yes

GPS: Yes

Compass: Yes

Battery (Dive): ~36 h

Battery (Watch): ~11 days

Case Size: 51 mm

User Guide
Shipping & Returns
  • Free standard shipping on orders over $50
  • Free 2-day shipping on orders over $300
  • Standard Ground delivery in 3–5 business days
  • Most orders process within 1 business day
  • Free returns within 60 days — buyer covers return shipping unless it's our error
  • Free return shipping on exchanges

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Questions? Email info@sbaquatics.com or see our full Shipping & Returns Policy.

Reviews

Frequently Asked Questions?

How does the Mk3i 51mm differ from the 43mm?
The 51mm has a larger 1.4 inch display vs the 43mm 1.2 inch screen. Battery life is slightly shorter (11 vs 14 days smartwatch) due to the larger display. All dive features are identical between the two sizes.
What is the battery life of the Mk3i 51mm?
Approximately 36 hours in dive mode and up to 11 days in smartwatch mode per charge.
Does the Mk3i 51mm have the same dive features as the 43mm?
Yes - both Mk3i sizes have identical dive functionality: Buehlmann ZHL-16c algorithm, SubWave sonar (30 m), multi-tank AI (up to 8 divers), LED flashlight, and DiveView maps.
Is the Mk3i 51mm comfortable for daily wear?
The 51mm suits divers with larger wrists or those who prefer a bold display. The premium sapphire lens and titanium/stainless case are appropriate for both diving and everyday dress.

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