Garmin Descent™ Mk3i, Dive Computer and Multisport GPS

Product Overview

The Garmin Descent™ Mk3i is a watch-style dive computer and multisport GPS smartwatch engineered for serious divers who demand precision, durability, and advanced underwater capabilities. Designed specifically for scuba and freediving, it combines professional-grade dive features with everyday smartwatch functionality, making it ideal for both underwater exploration and daily fitness tracking. Whether you’re planning a technical dive or exploring new dive sites, the Mk3i supports your preparation with intelligent insights and real-time data. Its rugged build and high-contrast display ensure reliability in extreme conditions, while smart connectivity keeps you linked to your digital life when you’re back on land.

Key Features

• Advanced Dive Modes & Air Integration: Supports recreational to technical scuba diving and freediving with multiple dive modes. When paired with the Descent™ T2 transceiver (sold separately), it enables monitoring of tank pressures and depth for up to eight networked divers within a 10-meter range, providing critical group dive support.
• SubWave™ Sonar Communication: Exchange preset diver-to-diver messages up to 30 meters apart using sonar technology—available with software version 15.70 or later. This feature enhances safety and coordination during underwater excursions without requiring physical contact or hand signals.
• Bright 1.4” AMOLED Display with Sapphire Lens: Offers exceptional clarity and readability in all lighting conditions, including deep or murky water. The scratch-resistant sapphire lens and 51 mm titanium bezel ensure long-term durability against impacts and corrosion.
• Built-in LED Flashlight: Provides variable intensities and strobe modes in red or white light, improving visibility in low-light environments both above and below the surface. Ideal for night dives or navigating dark underwater caves.
• Dive Readiness Tool: Analyzes lifestyle factors such as sleep quality, exercise, stress levels, and jet lag to estimate your body’s preparedness for diving. This Garmin-developed feature helps you make informed decisions about dive planning based on your current physical state (data is an estimation and not a medical diagnosis).
• DiveView™ Maps: Access bathymetric depth contours and over 4,000 preloaded dive sites to locate ideal dive spots and orient yourself underwater. Combined with multi-band GPS and underwater compass functionality, navigation is precise from entry to exit (note: GPS does not function underwater).
• Comprehensive Dive Logging: Store and review data from up to 200 dives directly on the device. Sync with the Garmin Dive app on your smartphone to share logs, analyze performance, and plan future dives.
• Multisport & Smart Features: Built-in sports apps support fitness training with actionable insights for strength and endurance. Smart capabilities include Garmin Pay™ contactless payments, music storage, and smart notifications—all requiring a compatible smartphone.
• 24/7 Health Monitoring: Tracks wrist-based heart rate, advanced sleep stages, respiration, and Pulse Ox (not available in all countries). These metrics support overall wellness but are not intended for medical use (data presented is an estimation).

Technical Specifications

• Display: 1.4” AMOLED
• Lens Material: Scratch-resistant sapphire
• Bezel Material: 51 mm titanium
• Case Rating: 200-meter dive-rated
• Buttons: Metal leakproof inductive
• Dive Log Capacity: Up to 200 dives
• SubWave Sonar Range: Up to 30 meters (for messaging)
• Networked Diver Support: Up to 8 divers (with Descent T2 transceiver, sold separately, within 10 meters)
• LED Flashlight: Red and white light, variable intensity and strobe modes
• GPS: Multi-band GPS (does not work underwater)
• ABC Sensors: Includes underwater compass
• Health Sensors: Wrist-based heart rate, Pulse Ox, respiration, advanced sleep monitoring
• Smart Features: Garmin Pay, music storage, smart notifications (requires compatible smartphone)

Benefits & Use Cases

The Descent Mk3i is built for divers who want a single device that performs at depth and adapts to life on land. It’s ideal for recreational divers exploring new sites with DiveView maps, technical divers managing complex dives with air integration, and freedivers tracking performance across sessions. The dive readiness tool helps travelers and frequent divers assess their condition before entering the water, especially after long flights or intense training. Onshore, the multisport apps and health tracking support consistent fitness routines, while smart features like Garmin Pay and notifications keep you connected without needing your phone. Its titanium construction and sapphire lens make it suitable for harsh marine environments, and the inductive buttons ensure reliable operation even when wet or gloved.

Important Notes

• The Descent T2 transceiver is required for tank pressure monitoring and diver networking and is sold separately.
• SubWave sonar messaging requires software version 15.70 or later.
• GPS functionality does not operate underwater; positioning is only available on the surface.
• Pulse Ox sensor is not available in all countries.
• Health and dive readiness data are estimates and not intended for medical diagnosis or treatment.
• Smart features require a compatible smartphone for full functionality.