Garmin · 2023
Descent™ Mk3i – 51 mmSize, Dimensions & Wrist Fit
The Garmin Descent™ Mk3i – 51 mm sits best on flat wrist widths of about 54–73mm (≈ 14.4–19.5cm wrist circumference). Adjust the slider below to check your wrist.
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The Descent™ Mk3i – 51 mm in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- Between 17 hours and 31 days per charge depending on the power mode — battery saver at best, all satellite systems + music at worst.
- Water rated to Dive (200 meters).
- 77.8g on the wrist. Lighter than 88% of the 51mm watches we have weights for.
- 1.4” diameter (35.56 mm) AMOLED display.
- Takes 26mm bands, so third-party straps fit without an adapter.
Does the Descent™ Mk3i – 51 mm fit your wrist?
Drag the slider to your wrist width and see the Descent™ Mk3i – 51 mm overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.
Happy with the fit? Check current availability for the Descent™ Mk3i – 51 mm.
Check offer2D Dimension Schematics
The Descent™ Mk3i – 51 mm drawn to scale — from above, and in profile against the wrist.
- Garmin Descent™ Mk3i – 51 mm51mm · 16.4mm thick
3D preview
Garmin Descent™ Mk3i – 51 mm on a wrist
On an arm sized to your own wrist — the view a product photo never gives you.
Shapes are built from published measurements, not manufacturer 3D models — accurate proportions, generic dial.
Which Descent Mk3i size fits you?
This model comes in 2 versions. Set your measurement and each one reports its own verdict — tap any size to open its page.
Which of these fits your wrist?
Roughly a 14.7cm wrist circumference — the measurement a tape gives you. Compared against lug-to-lug where we have it, case width otherwise.
All 2 Descent Mk3i variants fit this wrist. The 51mm gives you the most presence without overhanging; the smallest is the discreet end of the range.
- Width
- 43mm
- Thick
- 14.3mm
- Weight
- 49.3g
6.0mm clear a side
View this size- Width
- 51mm
- Thick
- 16.4mm
- Weight
- 77.8g
2.0mm clear a side
How long the Descent™ Mk3i – 51 mm lasts, by power mode
Runtime changes by a factor of 44 depending on what you leave switched on. Bars are scaled against the longest mode.
always-on displayraise-to-wake
- Battery Saver31 days
- Smartwatch25 days · 10 days always-on
- Expedition GPS24 days
- Max Battery GPS118 hours
- GPS Only76 hours · 56 hours always-on
- Dive66 hours
- All Satellite Systems55 hours · 43 hours always-on
- All Satellite Systems + Multi-band48 hours · 38 hours always-on
- Dive with Air Integration40 hours
- All Satellite Systems + Music17 hours
How the Descent™ Mk3i – 51 mm ranks on battery
Against the 268 Garmin watches in our database, ranked on each figure Garmin publishes.
- Everyday use25 days#53 of 257
- GPS tracking76 hours#26 of 233
- Power save31 days#69 of 106
What size band does the Descent™ Mk3i – 51 mm take?
Lug width
26mm
Any 26mm strap fits, so you are not restricted to Garmin's own bands. Quick-release pins let you swap without tools — check that a replacement lists 26mm and quick-release before buying.
Affiliate disclosure: As an Amazon Associate, WatchFitTool earns from qualifying purchases. If you buy through links on this page, we may earn a commission at no extra cost to you. Learn more.
Descent™ Mk3i – 51 mm specifications
The figures that decide a purchase, followed by every line Garmin publishes.
- Battery life
- Smartwatch: Up to 25 days (10 days always-on) Battery Saver Watch Mode: Up to 31 days GPS Only: Up to 76 hours (56 hours always-on) All Satellite Systems: Up to 55 hours (43 hours always-on) All Satellite Systems + Multi-band: Up to 48 hours (38 hours always-on) All Satellite Systems + Music: Up to 17 hours Max Battery GPS: Up to 118 hours Expedition GPS: Up to 24 days Dive Mode: Up to 66 hours Dive Mode with Air Integration: Up to 40 hours
- Display
- 1.4” diameter (35.56 mm)
- Resolution
- 454 x 454 pixels
- Water rating
- Dive (200 meters)
- Case material
- fiber-reinforced polymer with titanium rear cover
- Bezel
- Diamond-like Carbon (DLC) coated titanium
- Glass
- sapphire crystal
- Strap
- silicone or DLC coated titanium
- Storage
- 32 GB
- Charging
- Garmin proprietary clip charger
Full specification sheet
348 published lines across 23 groups, unedited
Overview
- Family
- Garmin
General
- Battery life
- Smartwatch: Up to 25 days (10 days always-on) Battery Saver Watch Mode: Up to 31 days GPS Only: Up to 76 hours (56 hours always-on) All Satellite Systems: Up to 55 hours (43 hours always-on) All Satellite Systems + Multi-band: Up to 48 hours (38 hours always-on) All Satellite Systems + Music: Up to 17 hours Max Battery GPS: Up to 118 hours Expedition GPS: Up to 24 days Dive Mode: Up to 66 hours Dive Mode with Air Integration: Up to 40 hours
- Display Size
- 1.4” diameter (35.56 mm)
- Case material
- fiber-reinforced polymer with titanium rear cover
- Color display
- Lens Material
- sapphire crystal
- Bezel Material
- Diamond-like Carbon (DLC) coated titanium
- Memory/History
- 32 GB
- Strap material
- silicone or DLC coated titanium
- Charging method
- Garmin proprietary clip charger
- Large font option
- Display resolution
- 454 x 454 pixels
- Leakproof inductive buttons
- QuickFit® watch band compatible
- yes (26 mm)
Sensors
- GPS
- Compass
- GLONASS
- Galileo
- Gyroscope
- Thermometer
- Depth sensor
- Accelerometer
- SatIQ™ Technology
- Ambient light sensor
- Barometric altimeter
- Pulse Ox Blood Oxygen Saturation Monitor
- Garmin Elevate™ wrist heart rate monitor
Product Info
- Main SKU
- 010-02752-10
- Product ID
- 852159
- Product Name
- Descent™ Mk3i – 51 mm
- Release Date
- 11/15/2023
- Product Variation
- Carbon Gray DLC Titanium with Black Silicone Band
Clock Features
- Timer
- Stopwatch
- Time/date
- Alarm clock
- GPS Time Sync
- Sunrise/sunset times
- Automatic daylight saving time
Diving Features
- PO2
- Up to 2.0 with customizable deco PO2 setting
- Tides
- Backlight
- yes (configurable time and intensity; auto-on at depth)
- Gas mixes
- Air, Nitrox and Trimix, up to 100% O2; 1 bottom gas and up to 11 deco and/or backup gasses.
- APNEA mode
- Deep Stops
- yes (using custom gradient factors)
- Gauge mode
- Pool APNEA
- No fly time
- Safety Stop
- yes (customizable off/3min/5min)
- Dive planner
- yes (basic NDL + multi-gas deco planner)
- Multi-gas mode
- Nitrox support
- Trimix support
- APNEA hunt mode
- Air integration
- yes (via Subwave™)
- Alerts & alarms
- Audible and vibration alarms for ascent rate, PO2, CNS/OTU, NDL, deco, gas switching, tank pressure, gas consumption rate. Customizable (up to 40) audible and/or vibration per dive mode, based on depth or time
- Single-gas mode
- Gas time remaining
- Subwave™ Support
- 3-axis dive compass
- yes (with adjustable heading, quick change to 90R, 90L and reciprocal). Indicates degrees and direction back to set heading
- Auto start/end dive
- Decompression model
- Bühlmann ZHL-16c with gradient factors
- Missed Deco Lockout
- yes (can be disabled prior to dive with user acknowledgement)
- Gas consumption rate
- Custom end-dive timeout
- yes (20s to 10 m)
- Custom dive data screens
- Customizable conservatism
- yes (low/medium/high or custom using gradient factors)
- Surface diver status widget
- yes (surface interval, N2/HE loading, CNS, OTU and tissue compartment status)
- Automatic altitude adjustment
- Residual Tissue Loading Reset
- yes (on the surface with user acknowledgement)
- Closed Circuit Rebreather (CCR)
- Number of transmitters supported
- 8
- Dive ascent/descent rate indicator
- Dive activity maximum operating depth
- 200 meters
- Sync dive log to Garmin Dive™ Mobile app
- Automatically saves dive entry and exit locations
Gaming Features
- Gaming Activity
- GameOn™ app compatible
Boating Features
- Anchor Alarm
- Countdown timer
- Tack assist mode
- Autopilot Control
- Boat Data Streaming
- CIQ
- Virtual starting line
- Available Boating Profiles
- Boating, Sailing, Sail Racing
- Wearable trolling motor remote
- Built-in barometer and tide tables
- yes (downloadable tides)
Cycling Features
- Courses
- Power guide
- MTB Grit & Flow
- Race an activity
- Power meter compatible
- Advanced cycling dynamics
- Power curve and % FTP workouts
- Compatible with Varia™ lights
- FTP (Functional Threshold Power)
- yes (with compatible accessory)
- Compatible with Varia headlight camera
- Speed and cadence sensor support (w/sensor)
- Cycle Map (routable cycling-specific street map)
- Bike lap and lap maximum power (with power sensor)
- Compatible with Varia™ radar (rear-facing radar)
- Compatible with Vector™ and Rally™ (power meters)
- Compatible with Varia Vision™ (head-mounted display)
- Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)
Golfing Features
- PinPointer
- Custom targets
- Tempo Training
- Virtual caddie
- Full vector map
- Handicap scoring
- Tournament legal
- Digital scorecard
- Garmin AutoShot™
- PlaysLike distance
- Round timer/odometer
- Auto CourseView updates
- Yardage to layups/doglegs
- Hazards and course targets
- Pairs with Garmin Golf app
- Green View with manual pin position
- Preloaded with 43,000 courses worldwide
- Green Contours (with Garmin Golf membership)
- CT10 Automatic club tracking compatible (requires accessory)
- Yardage to F/M/B (distance to front, middle and back of green)
- Stat tracking (strokes, putts per round, greens and fairways hit)
- Wind speed and direction (requires connection to Garmin Golf app)
- Touch-targeting (touch target on display to see the distance to any point)
- Measures shot distance (calculates exact yardage for shots from anywhere on course)
- automatic
Running Features
- Hill score
- Run workouts
- Running power
- Race predictor
- Foot pod capable
- Running dynamics
- Lactate threshold
- yes (with compatible accessory)
- Grade-adjusted pace
- Trail run auto climb
- Performance condition
- Run/Walk/Stand detection
- Stride length (real time)
- PacePro™ Pacing Strategies
- Vertical oscillation and ratio
- Ground contact time and balance
- GPS-based distance, time and pace
- Course- and weather-specific race predictor
- Cadence (provides real-time number of steps per minute)
What You'll Love
- Touchscreen
- Display type
- AMOLED
- Water rating
- Dive (200 meters)
- Garmin Pay™
- Music storage
- LED flashlight
- Multi-band GPS
- Training status
- yes (improved)
- Built-in mapping
- Training readiness
- Pulse Ox blood oxygen
- Sleep score and insights
- Battery life (smartwatch mode)
- Up to 25 days (10 days always-on)
Activity Profiles
- Gym
- Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing
- Swim
- Pool Swimming, Open Water Swimming
- Cycling
- Biking, Road Biking, Mountain Biking, Gravel Biking, Bike Commuting, Bike Touring, eBiking, eMountain Biking, Indoor Biking, Cyclocross, BMX
- Wellness
- Walking, Pilates, Yoga, Indoor Walking
- Multisport
- Swimming/Running, Triathlon
- In the ring
- Boxing, Mixed Martial Arts
- Team sports
- Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball
- Motor sports
- Motorcycling, Overlanding, Motocrossing, ATVing, Snowmobiling
- On the Water
- Stand Up Paddleboarding, Rowing, Kayaking, Surfing, Kiteboarding, Windsurfing, Fishing, Boating, Sailing, Sail Racing, Water Skiing, Wakeboarding, Wakesurfing, Tubing, Snorkeling, Sailing Expedition, Whitewater
- Racket sports
- Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball
- Snow & winter
- Skiing, Snowboarding, Backcountry Snowboarding, XC Classic Skiing, Backcountry Skiing, Ice Skating, Snowshoeing
- Indoor running
- Treadmill Running, Indoor Track Running, Virtual Running
- Outdoor running
- Running, Outdoor Track Running, Trail Running, Ultra Running, Obstacle Racing
- Outdoor recreation
- Hiking, Indoor Climbing, Bouldering, Climbing, Hunting, Horseback Riding, Golfing, Disc Golf, Archery
- Other activity profiles
- Jumpmaster, Tactical, Inline Skating
Swimming Features
- Pool swim workouts
- Critical swim speed
- Time and distance alerts
- Auto rest (pool swim only)
- Drill logging (pool swim only)
- Pacing alerts (pool swim only)
- Countdown start (pool swim only)
- Underwater wrist-based heart rate
- "Repeat on" rest timer (pool swim only)
- Basic rest timer (up from 0) (pool swim only)
- Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only)
- Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories)
- Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories)
- Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim)
- yes (with HRM-Tri, HRM-Swim, HRM-Pro or HRM-Pro Plus)
Tactical Features
- Kill switch
- Stealth Mode
- Ballistics solver
- yes (unlock required)
- Night vision mode
- XERO™ Locations
- Dual grid coordinates
Outdoor Recreation
- Tides
- Up Ahead
- Auto rest
- TracBack®
- Sight 'N Go
- Tide glance
- Back to start
- Fish forecast
- Explore Nearby
- UltraTrac mode
- Vertical speed
- GPS coordinates
- Reference point
- Area calculation
- yes (via Connect IQ™)
- Elevation profile
- Projected waypoint
- Total ascent/descent
- Future elevation plot
- NextFork™ navigation
- Distance to destination
- Expedition GPS Activity
- Sun and moon information
- Point-to-point navigation
- Preloaded ski resort maps
- ClimbPro™ Ascent Planner
- Rest Timer (Ultra Run only)
- Preloaded road and trail maps
- Bread crumb trail in real time
- Downloadable cartography support
- Barometric trend indicator with Storm Alert
Daily Smart Features
- Stocks
- Calendar
- Connectivity
- Bluetooth®, ANT+®, Wi-Fi®, Subwave™
- Garmin Share
- Find My Phone
- Find My Watch
- VIRB® Remote
- Morning report
- Red shift mode
- Weather forecasts
- Smart Notifications
- Smart trainer control
- Smartphone compatibility
- iPhone®, Android™
- Controls smartphone music
- On-device Connect IQ™ Store
- Plays and controls watch music
- Find My Phone during GPS activity
- Pairs with Garmin Connect™ Mobile
- Compatible with Garmin Messenger app
- Battery saver (customizable low power watch)
- Realtime settings sync with Garmin Connect™ mobile
- View images from notifications on watch (Android™ only)
- Text response/reject phone call with text (Android™ only)
- Connect IQ™ (downloadable watch faces, data fields and apps)
Activity Tracking Features
- TrueUp™
- Move IQ™
- Step counter
- Floors climbed
- Calories burned
- Distance traveled
- Intensity minutes
- Automatic rep counting
- Garmin Connect™ Challenges app
- yes (optional Connect IQ app)
- Move alerts (displays on device after a period of inactivity)
- Auto goal (learns your activity level and assigns a daily step goal)
Workout and Training Plans
- HIIT workouts
- Yoga workouts
- Cardio workouts
- Pilates workouts
- Strength workouts
- Garmin Cycling Coach
- Garmin Running Coach
- Garmin Running Coach Experts
- On-screen workout animations
- On-screen workout muscle maps
- Daily Suggested Workout - Cycling
- Daily Suggested Workout - Running
- Garmin Coach - Prebuilt Cycling Plans
Health & Wellness Monitoring
- Sleep
- yes (advanced)
- Hydration
- yes (in Garmin Connect™)
- Breathwork
- Fitness age
- yes (in app)
- Nap detection
- All-day stress
- Women's health
- yes (in Garmin Connect™)
- Health snapshot
- Jet lag adviser
- Respiration rate
- Skin temperature
- Resting heart rate
- Abnormal heart rate alerts
- yes (high and low)
- Relaxation breathing timer
- Body Battery™ energy monitor
- Wrist-based heart rate (constant, every second)
Safety and Tracking Features
- Assistance
- Live Event Sharing
- Incident Detection during select activities
- Incident detection alert on phone for wearables
Kid Activity Tracking Features
- Toe-to-Toe™ Challenges app
- yes (optional Connect IQ Toe-to-Toe™ Challenges app)
Training, Planning and Analysis Features
- % HRR
- % HR max
- HR zones
- HR alerts
- Shortcuts
- HRV status
- Load ratio
- Manual lap
- Rest timer
- Auto max HR
- Auto scroll
- Finish time
- HR calories
- Voice alerts
- Custom alerts
- Physio TrueUp
- Recovery time
- Training load
- VO2 Max (Run)
- Course guidance
- Endurance score
- Training effect
- Virtual Partner
- Race an Activity
- Realtime stamina
- Advanced workouts
- Interval training
- Race glance/widget
- Training load focus
- VO2 Max (Trail Run)
- Garmin Live Segments
- Strava Live Segments
- GPS speed and distance
- Improved recovery time
- Configurable lap alerts
- Customizable data pages
- Unified training status
- Touch and/or button lock
- Activity history on watch
- Downloadable training plans
- Training effect (anaerobic)
- Manual multisport activities
- HRM running pace and distance
- Heat and altitude acclimation
- Customizable activity profiles
- Trendline™ Popularity Routing
- Auto Pause® automatic timer halt
- Respiration rate (during exercise)
- yes (with compatible accessory)
- Auto Lap® interval tracking feature
- Primary benefit (Training Effect labels)
- Round-trip course creator (running/cycling)
- Power Modes - customizable in-activity battery settings
- HR broadcast (broadcasts HR data over ANT+® to paired devices)
- Improved interval (includes open repeats, intervals data page, rest screen and auto detection)
- HRV stress test (measures your heart rate variability while standing still, for 3 minutes, to provide you with an estimated stress level; the scale of this is 1 to 100; low scores indicate lower stress levels)
- yes (with compatible accessory)
Compare the Descent™ Mk3i – 51 mm head to head
How each one differs in the three measurements you can feel on the wrist. Figures are relative to the Descent™ Mk3i – 51 mm.
Garmin
Descent™ G2
- Width
- -5.5mm
- Thick
- -1.2mm
- Weight
- -12.8g
Garmin
Descent™ G1 Solar
- Width
- -5.5mm
- Thick
- -1.2mm
- Weight
- -11.8g
Garmin
Descent™ G1 Solar - Ocean Edition
- Width
- -5.5mm
- Thick
- -1.2mm
- Weight
- -16.8g
Garmin
Descent™ Mk3i – 43 mm
- Width
- -8mm
- Thick
- -2.1mm
- Weight
- -28.5g
Alternatives to the Descent™ Mk3i – 51 mm
Watches that cover a similar amount of wrist, with the measurements that separate them.
Garmin
tactix® 8 – 51 mm, Solar
- Width
- 51mm
- Thick
- 15.4mm
- Weight
- 95g
Garmin
tactix® 8 – 51 mm, Solar, Elite
- Width
- 51mm
- Thick
- 15.4mm
- Weight
- 95g
Garmin
tactix® 8 – 51 mm, AMOLED
- Width
- 51mm
- Thick
- 14.7mm
- Weight
- 92g
Garmin
Enduro™ 3
- Width
- 51mm
- Thick
- 15.7mm
- Weight
- 63g
Garmin
fēnix® 8 – 51 mm, Solar
- Width
- 51mm
- Thick
- 15.4mm
- Weight
- 95g
Garmin
fēnix® 8 – 51 mm, AMOLED
- Width
- 51mm
- Thick
- 14.7mm
- Weight
- 102g
Descent™ Mk3i – 51 mm — Frequently Asked Questions
Will the Garmin Descent™ Mk3i – 51 mm fit my wrist?
The Garmin Descent™ Mk3i – 51 mm looks balanced on flat wrist widths of roughly 54–73mm (about 14.4–19.5cm circumference). Drag the slider above to check it against your own measurement.
What size band does the Garmin Descent™ Mk3i – 51 mm take?
26mm. Any 26mm strap fits, so you are not limited to Garmin's own bands — look for a quick-release fitting if you want to swap without tools.
How long does the Garmin Descent™ Mk3i – 51 mm battery last?
Between 17 hours and 31 days per charge, depending on the power mode. Garmin rates Battery Saver at 31 days and All Satellite Systems + Music at 17 hours; the chart above lists all 10 modes.
How does the Garmin Descent™ Mk3i – 51 mm battery compare with other Garmin watches?
At 25 days in everyday use it ranks #53 of the 257 Garmin watches in our database — the top 21% of the range. The full ranking, including GPS and power-saving figures, is on our Garmin battery life comparison.
Is the Garmin Descent™ Mk3i – 51 mm thick for a 51mm watch?
At 16.4mm, thicker than 77% of 51mm watches — it will sit noticeably high on the wrist. Thickness, not case width, is what decides whether a watch catches on a shirt cuff.
Should I get the 43mm or 51mm Descent Mk3i?
The Descent Mk3i comes in 2 case sizes — 43mm, 51mm. Which one suits you depends on the flat width of your wrist rather than preference: the larger sizes need a wider wrist to sit inside the edge. Set your measurement in the size picker above and each variant reports its clearance in millimetres.
What other watches are the same size as the Garmin Descent™ Mk3i – 51 mm?
Huawei Watch D, Omega Seamaster Chrono-Quartz, Tissot Lepine Mechanical all sit within half a millimetre of the Garmin Descent™ Mk3i – 51 mm's 51mm case, so they cover the same amount of wrist.
