vs
7.5Display7.5
8.4Battery life9.4
9.4Health tracking8.3
7.0Sports & outdoor8.2
6.5Smart features3.2
9.6Build & durability6.0
Dimensions
Size comparison
Descent Mk3i 51mmFenix 8 51mm AMOLED
| Descent Mk3i 51mm | Fenix 8 51mm AMOLED | Difference | |
|---|---|---|---|
| Height | 51 mm | 51 mm | = |
| Width | 51 mm | 51 mm | = |
| Thickness | 16.4 mm | 14.7 mm | +1.7 mm |
| Weight | 78 g | 102 g | −24 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Descent Mk3i 51mm better than Fenix 8 51mm AMOLED?
- Water resistance20 ATM vs 10 ATM2×
- Rated dive depth200 m vs 40 m5×
- Weight77.8 g vs 102 g+31%
Why is Fenix 8 51mm AMOLED better than Descent Mk3i 51mm?
- Battery life (smartwatch mode)25 days vs 29 days+16%
- GPS battery life76 h vs 84 h+11%
- Battery saver mode31 days vs 41 days+32%
- Battery life with always-on display10 days vs 13 days+30%
- GPS battery life (dual-band)48 h vs 62 h+29%
- Thickness16.4 mm vs 14.7 mm+12%
Specifications
Side by side
| Design & durability | ||
| Case size | 51 mm | 51 mm |
| Weight | 77.8 g | 102 g |
| Thickness | 16.4 mm | 14.7 mm |
| Height | 51 mm | 51 mm |
| Width | 51 mm | 51 mm |
| Case material | Titanium | Titanium |
| Sapphire crystal | Yes | Yes |
| Lens / cover glass | sapphire crystal | Corning® Gorilla® Glass or sapphire crystal |
| Strap material | silicone or DLC coated titanium | silicone |
| Water resistance | 20 ATM | 10 ATM |
| Water rating (maker) | Dive (200 meters) | 10 ATM |
| Rated dive depth | 200 m | 40 m |
| Display | ||
| Screen size | 1.4″ | 1.4″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Touchscreen | Yes | Yes |
| Resolution (width) | 454 px | 454 px |
| Resolution (height) | 454 px | 454 px |
| Pixel density | 324 ppi | 324 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 25 days | 29 days |
| Battery life with always-on display | 10 days | 13 days |
| Battery saver mode | 31 days | 41 days |
| GPS battery life | 76 h | 84 h |
| GPS battery life (dual-band) | 48 h | 62 h |
| Battery type | — | Lithium ion |
| Wireless charging | No | No |
| Charging | Garmin proprietary clip charger | Garmin proprietary plug charger |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | — | Yes |
| Skin temperature | Yes | Yes |
| Temperature sensor | Yes | Yes |
| HRV tracking | Yes | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | GPS, GLONASS, Galileo, SatIQ technology, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer, Ambient light sensor, Depth sensor | GPS, GLONASS, Galileo, QZSS, BeiDou, SatIQ technology, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer, Ambient light sensor, Depth sensor |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | Yes | Yes |
| Satellite systems | GLONASS, GALILEO | GLONASS, GALILEO, BDS, QZSS |
| Offline maps | Yes | Yes |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | Yes | Yes |
| Sport profiles | 98 | 99 |
| Dive mode | Yes | Yes |
| LED flashlight | Yes | Yes |
| Connectivity | ||
| NFC payments | Yes | Yes |
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| ANT+ sensors | Yes | Yes |
| Smart features | ||
| Calls from the wrist | — | Yes |
| Speaker | — | Yes |
| Microphone | — | Yes |
| Voice assistant | — | Yes |
| Music on the watch | Yes | Yes |
| Storage | 32 GB | 32 GB |
| Third-party apps | Yes | Yes |
| Platform | ||
| Operating system | Garmin OS | Garmin OS |
| Platform | Proprietary | Proprietary |
| Works with | iOS, Android | iOS, Android |
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