COROS
Device summary
Garmin
Descent Mk3 43mm
Full specifications
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2023 |
| Starting price | $429 | — |
| Display size | 1.2-inch | 1.2-inch |
| Dimensions | 42.6 mm × 42.6 mm × 14.0 mm | 43.0 mm × 43.0 mm × 14.2 mm |
| Weight | 44 g | 54 g |
| Front material | Sapphire glass | — |
| Back material | Fiber-reinforced polymer | — |
| Display | ||
| Display technology | Memory-in-Pixel (3rd gen MIP touch) | AMOLED |
| Resolution | 240 × 240 | 390 × 390 |
| Protection | Sapphire glass | — |
| Performance | ||
| Chipset | All-satellite dual-frequency GNSS | — |
| Storage | 32 GB | — |
| Expandable storage | No | — |
| Battery & charging | ||
| Charging standard | Magnetic charging (<2 h). Daily use 15 days; all-systems GPS 34 h; dual-frequency GPS 26 h; Endurance all-systems 41 h (extended mode — not everyday life); music modes shorter | Garmin proprietary clip / USB charging |
| Battery type | Lithium-ion | Lithium-ion |
| Connectivity | ||
| Cellular | GPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency), Downloadable global Landscape / Topo maps, Speaker + dual microphone, ECG sensor | GPS / multi-GNSS |
| Wi‑Fi | Wi-Fi / COROS App | — |
| Bluetooth | Bluetooth | Bluetooth |
| NFC | — | Yes |
| Build & durability | ||
| Frame | Fiber-reinforced polymer; Grade 5 titanium bezel | Fiber-reinforced polymer; stainless-steel bezel |
| Ingress protection | 5 ATM | Dive 200 m |
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2023 |
| Starting price | $429 | — |
| Display size | 1.2-inch | 1.2-inch |
| Dimensions | 42.6 mm × 42.6 mm × 14.0 mm | 43.0 mm × 43.0 mm × 14.2 mm |
| Weight | 44 g | 54 g |
| Front material | Sapphire glass | — |
| Back material | Fiber-reinforced polymer | — |
| Display | ||
| Display technology | Memory-in-Pixel (3rd gen MIP touch) | AMOLED |
| Resolution | 240 × 240 | 390 × 390 |
| Protection | Sapphire glass | — |
| Performance | ||
| Chipset | All-satellite dual-frequency GNSS | — |
| Storage | 32 GB | — |
| Expandable storage | No | — |
| Battery & charging | ||
| Charging standard | Magnetic charging (<2 h). Daily use 15 days; all-systems GPS 34 h; dual-frequency GPS 26 h; Endurance all-systems 41 h (extended mode — not everyday life); music modes shorter | Garmin proprietary clip / USB charging |
| Battery type | Lithium-ion | Lithium-ion |
| Connectivity | ||
| Cellular | GPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency), Downloadable global Landscape / Topo maps, Speaker + dual microphone, ECG sensor | GPS / multi-GNSS |
| Wi‑Fi | Wi-Fi / COROS App | — |
| Bluetooth | Bluetooth | Bluetooth |
| NFC | — | Yes |
| Build & durability | ||
| Frame | Fiber-reinforced polymer; Grade 5 titanium bezel | Fiber-reinforced polymer; stainless-steel bezel |
| Ingress protection | 5 ATM | Dive 200 m |
Key differences
The most meaningful measured gaps in size and weight — not an overall winner.
Height
Very similar height
Width
Very similar width
Thickness
Very similar thickness
Display size
Very similar display size
Height, width, thickness, and weight are very similar between these devices.
What these size differences mean
Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.
- Descent Mk3 43mm is 0.4 mm (0.9% relative to APEX 4 42mm) wider. Check this difference against the width of your current device and pocket opening.
- Descent Mk3 43mm is 0.4 mm (0.9% relative to APEX 4 42mm) taller. This describes the body outline; screen diagonal alone does not tell you the overall size.
- Descent Mk3 43mm is 0.2 mm (1.4% relative to APEX 4 42mm) thicker. Cases and camera protrusions can change the clearance you need.
- A direct weight difference is not shown because comparable fixed device weights are unavailable or include a strap.
Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.
Sources and measurement notes
Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.
Descent Mk3 43mm
Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.