Garmin Descent™ Mk3i, Dive Computer and Multisport GPS

Product Overview

The Garmin Descent™ Mk3i is a high-performance dive computer and multisport GPS smartwatch engineered for serious divers and active adventurers. Designed with a 200-meter dive-rated case and purpose-built dive features, it supports recreational, technical, and freediving with precision and reliability. Its advanced SubWave™ sonar technology enables diver-to-diver communication and real-time monitoring of tank pressures and depths for up to eight divers when used with the optional Descent™ T2 transceiver. Whether exploring underwater environments or training on land, the Mk3i delivers essential data, navigation, and health insights in a durable, titanium-clad design. With integrated smartwatch capabilities, it keeps users connected and informed above and below the surface.

Key Features

• 1.4” AMOLED Display with Sapphire Lens: A bright, high-resolution screen ensures clear visibility in all lighting conditions, while the scratch-resistant sapphire lens and 51 mm titanium bezel provide long-term durability in harsh environments.
• SubWave™ Sonar Communication: Enables diver-to-diver messaging via preset messages up to 30 meters underwater (requires software v.15.70 or later). When paired with the Descent™ T2 transceiver (sold separately), it supports tank pressure and depth monitoring for up to eight divers within a 10-meter range, enhancing group safety and coordination.
• Built-in LED Flashlight: Offers variable intensities and strobe modes in red or white light, improving visibility in low-light conditions both underwater and on land.
• Dive Readiness Tool: Analyzes lifestyle factors such as sleep, exercise, stress, and jet lag to estimate your body’s preparedness for diving, helping you make informed decisions about dive planning (data is an estimation based on tracked metrics).
• DiveView™ Maps: Includes bathymetric depth contours and access to over 4,000 dive sites to assist with dive site selection, orientation, and navigation.
• Multi-Band GPS & ABC Sensors: Delivers accurate positioning on the surface, while built-in sensors—including an altimeter, barometer, compass, and underwater compass—support navigation from entry to exit (GPS does not function underwater).
• Dive Logging & Sharing: Stores up to 200 dives directly on the device, with the ability to review and share logs via the Garmin Dive app on a compatible smartphone.
• Multisport & Fitness Apps: Built-in sports apps support training and fitness tracking, offering actionable insights to improve strength, endurance, and overall performance.
• 24/7 Health Monitoring: Tracks wrist-based heart rate, sleep stages, respiration, Pulse Ox, and more for continuous wellness insights (not a medical device; Pulse Ox availability varies by region).
• Smart Connectivity: Features Garmin Pay™ for contactless payments, music storage, and smart notifications—keeping you connected when away from your phone (requires compatible smartphone).

Technical Specifications

• Display: 1.4” AMOLED, scratch-resistant sapphire lens
• Physical Size: 51 x 51 x 16.4 mm
• Wrist Fit: Silicone band (135–230 mm), Extra long silicone band (135–355 mm), Titanium bracelet (135–220 mm)
• Dive Rating: 200 meters
• Bezel Material: Titanium
• Buttons: Metal leakproof inductive buttons
• SubWave Sonar Range: Up to 30 meters for messaging; up to 10 meters for diver monitoring (with Descent™ T2)
• Supported Dive Modes: Recreational, technical scuba, and freediving
• Max Dive Logs: 200
• Health Sensors: Wrist-based heart rate, Pulse Ox, advanced sleep monitoring, respiration tracking
• Navigation: Multi-band GPS, ABC sensors (altimeter, barometer, compass), underwater compass
• Connectivity: Bluetooth, ANT+, Wi-Fi
• Additional Features: LED flashlight (red/white), Garmin Pay, music storage, smart notifications

Benefits & Use Cases

The Garmin Descent™ Mk3i is ideal for divers who demand reliability, advanced communication, and comprehensive data tracking. Its SubWave sonar system enhances safety during group dives by enabling real-time monitoring of tank levels and depth across multiple divers, while preset messaging keeps teams in sync without hand signals. The dive readiness feature helps users assess their physical and mental state before entering the water, promoting safer dive practices. On land, the multisport apps and health monitoring tools support training goals, recovery, and daily wellness. The rugged titanium build, sapphire lens, and inductive buttons ensure the device withstands extreme conditions, making it suitable for both deep-sea exploration and everyday wear. With DiveView maps and GPS navigation, it’s also a valuable tool for discovering new dive sites and planning expeditions.

Important Notes

The Descent™ Mk3i requires software version 15.70 or later to access SubWave messaging and diver monitoring features. The Descent™ T2 transceiver is sold separately and necessary for tank pressure and depth monitoring of other divers. GPS functionality is limited to surface use and does not operate underwater. Pulse Ox sensor availability varies by country. The dive readiness tool and health metrics are intended for informational purposes only and are not a substitute for medical advice. Always follow safe diving practices and consult a professional when planning technical dives.