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Coros vs. Garmin vs. Polar fitness test: How the new Vertix 2S compares to the Forerunner 965 and Vantage V3


COROS' new watch has a revamped GPS antenna and HR sensors; I tested them against two flagship fitness watches for accuracy.

Over the past week, I've pitted the new COROS VERTIX 2S against two other flagship fitness watches—the Garmin Forerunner 965 and Polar Vantage V3—to see how they compare in terms of GPS, heart rate, and elevation accuracy. (Image credit: Michael Hicks / Android Central)For this test, I wore all three fitness watches for a 5K urban run, a 2-mile track sprint workout, and an eight-mile hike on Mount Diablo trails with steep climbs and dense foliage. (Image credit: Michael Hicks / Android Central)To test these watches' accuracy, I wore a Polar H10 chest strap during my initial two runs to see how they handled sudden changes in heart rate.

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