Garmin Forerunner 255 is the training watch for serious trail runners. We looked at how GPS accuracy and battery life compare to the Fenix 7 and evaluated the training metrics.
Who it's for
Buy this if: Trail runners and mountain athletes who prioritize training metrics over mapping features.
Skip this if: Mountaineers and multi-day wilderness navigators who need TopoActive maps — the 255 doesn't include mapping.
In practice
Training vs. Navigation Watch
Fenix 7: topoactive maps, solar, ABC sensors, 100+ sports modes — the outdoor adventure watch. Forerunner 255: training load, body battery, sleep tracking, running dynamics — the athlete watch. For runners who navigate by planned course rather than map, the 255 provides identical GPS performance for 50% less.
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