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Garmin D2 Mach 2 Pro vs Samsung Galaxy Watch9

Physical
Case diameter 51 mm
Case thickness 16.5 mm
Weight 90 g
Case material Titanium
Bezel material Titanium
Lens / crystal sapphire crystal
Strap material leather and silicone
Strap width
Colors available
Water resistance 100 m
Military standard
Display
Display type AMOLED
Display diagonal 1.4 mm
Resolution width 454 px
Resolution height 454 px
Touchscreen No No
Always-on display No Yes
Max brightness
Battery
Smartwatch mode 576 h
GPS-only mode
All-systems GPS mode
Max battery saver mode
Charging type Garmin proprietary plug charger
Solar charging No No
Wireless charging No No
Positioning
GNSS systems
Multi-band / dual-frequency No No
Offline maps No No
Built-in maps Yes No
Turn-by-turn navigation No No
Sensors
Optical heart rate Yes Yes
ECG Yes No
SpO2 / pulse oximeter Yes No
Skin temperature No No
Accelerometer No No
Gyroscope No No
Compass Yes No
Barometric altimeter Yes No
Ambient thermometer No No
Microphone No No
Speaker No No
Connectivity
Bluetooth No No
Wi-Fi Yes No
NFC payments No No
Cellular / LTE Yes Yes
ANT+ No No
Music storage No No
Third-party apps No No
Satellite communication Yes No
Health & Fitness
Sleep tracking Yes Yes
Stress tracking Yes No
HRV tracking Yes No
Training load Yes No
Training readiness / recovery No No
VO2 max estimate Yes No
Running dynamics No No
Body battery / energy score No No
Menstrual cycle tracking Yes No
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode Yes No
Software
Operating system
Companion app
Voice assistant
Contactless payments No No