Garmin Descent Mk3 & Mk3i 51 mm & 43 mm, Titanium Dive

Product Overview

The Garmin Descent Mk3i is a premium watch-style dive computer engineered for serious divers who demand precision, durability, and advanced underwater communication. Built with a 51 mm titanium case and featuring a vibrant 1.4” AMOLED display protected by a scratch-resistant sapphire lens, it blends rugged performance with smartwatch functionality. Designed specifically for scuba and freediving, it supports multiple dive modes and integrates SubWave sonar technology for diver-to-diver messaging and tank monitoring when used with the optional Descent T2 transceiver. Beyond the water, it doubles as a high-performance GPS smartwatch with fitness tracking, music storage, and smart notifications, making it ideal for adventurers who want one device for diving and daily life.

Key Features

• Advanced Dive Computer with SubWave Sonar: Communicate with up to eight divers using preset messages at distances up to 30 meters (requires software v.15.70 or later). When paired with the Descent T2 transceiver (sold separately), monitor real-time tank pressure and depth for each diver within a 10-meter range, enhancing safety during group dives.
• Bright 1.4” AMOLED Display & Sapphire Lens: The high-resolution AMOLED screen delivers crisp visuals in all lighting conditions, while the scratch-resistant sapphire lens ensures long-term clarity and durability, even in harsh underwater environments.
• 200-Meter Dive-Rated Titanium Build: The 51 mm titanium bezel and case are engineered to withstand depths up to 200 meters. Metal leakproof inductive buttons ensure reliable operation underwater without compromising the watch’s structural integrity.
• Built-In LED Flashlight: A versatile LED flashlight offers variable intensities and strobe modes in both red and white light, providing essential visibility during night dives or low-light surface conditions without disturbing marine life.
• Dive Readiness Tool: This Garmin-developed feature analyzes lifestyle factors like sleep quality, stress levels, physical activity, and jet lag to estimate your body’s preparedness for diving. While not a medical diagnostic tool, it helps inform smarter dive planning decisions.
• DiveView Mapping & Navigation: Access bathymetric depth contours and over 4,000 preloaded dive sites to locate ideal diving spots and maintain orientation. Multi-band GPS ensures accurate positioning on the surface, and built-in ABC sensors—including an underwater compass—support navigation from entry to exit (note: GPS does not function underwater).
• Comprehensive Dive Logging: Store detailed data from up to 200 dives directly on the device, including depth, time, and environmental conditions. Sync and review logs via the Garmin Dive app on your compatible smartphone for post-dive analysis and sharing.
• Smartwatch & Fitness Integration: When not diving, use built-in sports apps to track workouts, monitor heart rate, and manage daily activity. Enjoy Garmin Pay for contactless payments, store music for offline listening, and receive smart notifications—all requiring a compatible smartphone.

Technical Specifications

• Model: Garmin Descent Mk3i (51 mm)
• Display: 1.4” AMOLED, scratch-resistant sapphire lens
• Case Material: Titanium with DLC coating
• Dive Rating: 200 meters
• Buttons: Metal leakproof inductive
• SubWave Sonar: Diver-to-diver messaging up to 30m (software v.15.70+), tank and depth monitoring for up to 8 divers (with Descent T2 transceiver, sold separately)
• LED Flashlight: Red and white light, variable intensity and strobe modes
• GPS: Multi-band GPS (surface use only)
• ABC Sensors: Underwater compass, altimeter, barometer
• Dive Log Capacity: Up to 200 dives
• Smart Features: Garmin Pay, music storage, smart notifications (smartphone required)
• Battery Life: Up to 25 days in smartwatch mode

Benefits & Use Cases

The Descent Mk3i is ideal for recreational and technical divers seeking a reliable, full-featured dive computer that transitions seamlessly to everyday wear. Its titanium construction and sapphire lens ensure long-term durability, while the AMOLED display offers excellent readability in bright sunlight or dim underwater settings. The SubWave sonar system enhances group dive safety by enabling silent communication and real-time tank monitoring—perfect for dive teams or guided excursions. The dive readiness tool helps divers assess their physical and mental state before entering the water, promoting safer practices. On land, the device supports active lifestyles with fitness tracking, GPS navigation, and smart connectivity, making it a true multi-sport companion. Whether exploring coral reefs, conducting deep technical dives, or training for freediving, the Mk3i delivers the tools needed for confident underwater exploration.

Important Notes

• The Descent T2 transceiver is required for tank pressure and multi-diver depth monitoring and is sold separately.
• SubWave diver-to-diver messaging requires software version 15.70 or later—ensure your device is updated.
• GPS functionality is available on the surface only and does not operate underwater.
• Smart features such as notifications, Garmin Pay, and music require a compatible smartphone.
• The dive readiness tool provides estimated insights based on tracked metrics and is not a substitute for medical advice.
• In the box: 1x Garmin Descent Mk3i 51 mm Carbon Gray DLC Titanium with DLC Titanium Band, 1x black silicone band, 1x black extra-long adjustment strap, 1x USB-C to clip, 1x charging/data cable, 1x Wearable4U Power Bank, 1x USB C-type adapter.