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How to choose a sports watch in 2026

Sports watches sit above fitness trackers and below adventure-grade ultra watches. The Mars Score weights GPS & sensors (40%), battery (40%) and design (20%). Multi-band GPS, weeks-long battery, and a barometric altimeter are the three features that separate this category from smartwatches.

Multi-band GPS is now the standard

has_multiband_gps (dual-frequency L1+L5) cuts urban-canyon drift to a fraction of single-band tracking. The Garmin Fenix 8 Solar, Forerunner 965, Suunto Race and Coros Apex 2 Pro all support it. If you run in cities or under heavy tree cover, this spec is decisive.

Battery in days and GPS hours

Sports watches are rated by two numbers: battery_smartwatch_days (idle/notifications) and battery_gps_hours (active GPS recording). A Garmin Fenix 8 Solar gets 20+ days of smartwatch time and 80+ hours of continuous GPS. The Polar Grit X2 Pro sits in the same envelope. Match GPS hours to your longest planned activity.

Sensors that matter for training

has_altimeter, has_ecg and has_pulse_ox separate training-focused watches from generic fitness wearables. Altimeter is mandatory for trail running, ski touring and mountaineering. ECG and pulse-ox are nice-to-haves for general health monitoring.

Solar charging

has_solar adds 2–10 days of additional battery for outdoor users. Indoor-only owners see negligible benefit; through-hikers and ultra-runners see weeks of extension.

Water resistance and case size

10 ATM minimum for ocean swimmers; 20 ATM for divers. Case size (case_size_mm) decides whether the watch sits comfortably on smaller wrists. See Buyer's Guides and Mars Labs for sport-specific picks.

How vsMars scores sports watches

Mars Score for sports watches weights GPS and battery equally — both are decisive for the training use case. See methodology for the full formula.