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Coros PACE 3 vs Garmin D2 Mach 2 Pro

Physical
Case diameter 51 mm
Case thickness 16.5 mm
Weight 39 g 90 g
Case material Titanium
Bezel material Polymer Titanium
Lens / crystal sapphire crystal
Strap material Silicone / Nylon leather and silicone
Strap width
Colors available
Water resistance 50 m 100 m
Military standard
Display
Display type LCD AMOLED
Display diagonal 30.48 mm 1.4 mm
Resolution width 240 px 454 px
Resolution height 240 px 454 px
Touchscreen Yes No
Always-on display No No
Max brightness
Battery
Smartwatch mode 576 h
GPS-only mode
All-systems GPS mode 25 h
Max battery saver mode
Charging type Garmin proprietary plug charger
Solar charging No No
Wireless charging No No
Positioning
GNSS systems GPS, GLONASS, Galileo, BeiDou, QZSS
Multi-band / dual-frequency Yes No
Offline maps No No
Built-in maps No Yes
Turn-by-turn navigation Yes No
Sensors
Optical heart rate Yes Yes
ECG No Yes
SpO2 / pulse oximeter Yes Yes
Skin temperature No No
Accelerometer No No
Gyroscope No No
Compass Yes Yes
Barometric altimeter Yes Yes
Ambient thermometer No No
Microphone No No
Speaker No No
Connectivity
Bluetooth No No
Wi-Fi Yes Yes
NFC payments No No
Cellular / LTE No Yes
ANT+ No No
Music storage Yes No
Third-party apps No No
Satellite communication No Yes
Health & Fitness
Sleep tracking Yes Yes
Stress tracking No Yes
HRV tracking Yes Yes
Training load Yes Yes
Training readiness / recovery No No
VO2 max estimate Yes Yes
Running dynamics No No
Body battery / energy score No No
Menstrual cycle tracking No Yes
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode Yes Yes
Software
Operating system
Companion app
Voice assistant
Contactless payments No No