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Spec drill · Water resistance

Fenix 8 (47mm) vs Vantage V3

A side-by-side readout for water resistance.

Garmin · Fenix 8 (47mm)
10ATM
▲ Lead
Polar · Vantage V3
5ATM
VerdictFenix 8 (47mm) wins on water resistance.
Context

Understanding water resistance

Water resistance is a numeric spec measured in ATM. On this metric, higher values are generally better, but returns diminish past category-typical thresholds — going from a low value to a mid value usually matters far more than going from a mid value to a high one. When comparing two products, focus on the percentage gap rather than the raw delta: a 200-unit lead means something very different at the low end of the range than at the high end. Pay attention to the unit, too — manufacturers sometimes quote peak or burst figures that are not sustained in real-world use. Cross-check the published number against independent measurements where possible, especially for performance and battery claims. Finally, remember that a single spec rarely tells the whole story; the Mars Score weighs water resistance together with the rest of the spec sheet so one outlier doesn't distort the verdict.

This matchupFenix 8 (47mm)'s 10ATM is roughly 100% higher than Vantage V3's 5ATM (a 5ATM gap). Whether that gap is noticeable depends on workload — small percentage gaps rarely change day-to-day experience, while gaps of 20% or more usually do.

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Other specs on this comparison

See the full Smartwatches category for all products ranked by Mars Score.