Garmin D2 Mach 2

Works with: iPhone and Android
Display: AMOLED, 1.4 in
Case sizes: 47 / 51 mm
Battery: 14 days
GPS battery: 47 hours
Water resistance: 10 ATM
Weight: 73 g

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Garmin D2 Mach 2 at a glance

Battery

Around two weeks

Up to 14 days in smartwatch mode. 47 hours with GPS.
GPS

Multi-band GPS

Maps on the wrist. Runs and rides without your phone.
Display

AMOLED, 1.4 in

1.4 in, always-on option and touchscreen.
Health

ECG on the wrist

Measures ECG, blood oxygen, skin temperature and HRV.
Phone & smart

iPhone and Android

Payments, music and calls.
Build

10 ATM water rating

73 g. 2 case sizes. Sapphire lens.

Garmin D2 Mach 2 full specifications

Overview

Brand	Garmin
Model	D2 Mach 2
Series	D2
Versions	51 mm

Platform & apps

Works with iPhone and Android phones, running Garmin.

It has an app store for extra apps and watch faces. Garmin Golf adds extra insights, but the core features are free.

Operating system	Garmin
Works with	iPhone and Android
Storage	32 GB
App store	Yes
Subscription	Optional
Subscription name	Garmin Golf
Subscription features	Green Contours

Display

A bright, colourful screen that looks like a phone display.

1.4 in, always-on option and touchscreen.

Display type	AMOLED
Screen size	1.4 in
Resolution	454 x 454
Colour display	Yes
Always-on display	Yes
Touchscreen	Yes
Controls	touchscreen, buttons

Design & durability

Comes in 2 case sizes (47, 51 mm) weighing 73 g.

Rated 10 ATM: fine for swimming, snorkelling and water sports. A sapphire lens resists scratches.

Case sizes	47 / 51 mm
Case shape	Round
Dimensions	47 x 47 x 13.8 mm
Thickness	13.8 mm
Weight (case)	73 g
Weight with band	73 g
Case material	fiber-reinforced polymer with metal rear cover
Bezel material	titanium
Lens	Sapphire crystal
Back material	metal rear cover
Band material	silicone, Italian leather and silicone
Band width	22 mm
Band fitting	QuickFit 22 mm
Fits wrists	125-208 mm
Water resistance	10 ATM

Battery

Around two weeks: up to 14 days in smartwatch mode.

With the always-on display, about 7 days. With GPS on, up to 47 hours, or 35 hours in multi-band mode. Makers test with their own settings, so treat these as best-case figures.

Battery (smartwatch mode)	14 days
Battery (GPS)	47 hours
Battery (multi-band GPS)	35 hours
All battery modes	Smartwatch: 14 days; Always-on display: 7 days; Battery saver: 23 days; GPS: 47 hours; All satellite systems: 38 hours; Multi-band GPS: 35 hours; All satellite systems: 10 hours; Max battery GPS: 3.4 days; Max battery GPS: 17 days; GPS: 37 hours
Battery type	Lithium ion
Charging	proprietary-plug

GPS & navigation

Built-in multi-band GPS for accurate tracks, even near tall buildings and trees.

Maps come preloaded on the watch.

GPS	Built-in
Multi-band GPS	Yes
Satellite systems	GPS, GLONASS, Galileo, QZSS, BeiDou
Automatic GNSS mode	Yes
Maps	Preloaded maps
Navigation features	point-to-point navigation, back-to-start, round-trip routing, climb planner, waypoints
Golf courses	43,000
Ski maps	Yes

Health & sensors

A health-focused watch: it measures ECG, blood oxygen, skin temperature and HRV.

For sleep, it offers sleep coaching. ECG availability can depend on your country.

Sensors	optical HR, SpO2, skin temperature, accelerometer, gyroscope, barometer, compass, ambient light, thermometer, depth
Heart-rate sensor	Garmin Elevate
Heart-rate tracking	24/7
ECG	Yes
High/low heart-rate alerts	Yes
Heart-rate variability	Yes
Blood oxygen (SpO2)	Yes
Skin temperature	Yes
Respiration rate	Yes
Sleep tracking	Sleep coaching
Stress tracking	Yes
Energy score	Body Battery
Readiness score	Training Readiness
Cycle tracking	Yes

Safety

Has an emergency SOS feature.

SOS works through your paired phone. Live tracking lets friends follow your workouts.

Emergency SOS	Via phone
Incident detection	Yes
Live tracking	Yes

Training

Built for training, with the metrics serious athletes use.

It adds a triathlon mode, running power and daily suggested workouts.

Auto activity detection	Yes
Triathlon / multisport	Yes
Swim tracking	Pool and open water
Underwater heart rate	Yes
Training metrics	VO2 max, training load, training effect, recovery time, race predictor, endurance score, lactate threshold, HRV status
Adaptive coaching	Yes
Running dynamics	Yes
Wrist running power	Yes
Strength rep counting	Yes
Heart-rate broadcast	Yes
External sensors	ANT+, HRM-Swim, HRM-Pro, HRM-Pro Plus, HRM 600 chest straps, power meter, foot pod, speed/cadence, bike radar/lights, golf club tags
Smart trainer control	Yes

Smart features

Smart extras include contactless payments, music storage and calls on the wrist.

Notifications	Yes
Message replies	Android
Calls on the watch	Yes
Speaker	Yes
Microphone	Yes
Contactless payments	Yes
Payment service	Garmin Pay
Music storage	Yes
Find my phone	Yes
Find my watch	Yes
Flashlight	Yes

Diving, golf & more

It works as a dive computer for single-gas scuba.

Rated to 40 m.

Specialist modes	golf, tactical, aviation, marine, ski
Diving	Single-gas dive computer
Max dive depth	40 m
Decompression model	Bühlmann ZHL-16c with Gradient Factors
Gases	air, nitrox

Specs compiled from Garmin's product pages and datasheets. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.