It examined 118 trackers the usage of a treadmill to finish the space of a marathon – 26.2 miles (42km).
It observed that the least dependable changed into the Garmin Vivosmart 4, which underestimated the distance with the aid of 10.8 miles – which means the researcher definitely ran 37 miles.
Garmin said it changed into due to the fact that specific tracker did no longer incorporate GPS.
It described the Vivosmart 4 as an “all-spherical smart fitness tracker” and advised that marathon runners use its Forerunner variety which is GPS-enabled.
Of the 8 Apple models worried within the test, the Apple Watch collection 1 turned into the most correct, over-estimating the space by 1%, while the collection 3 hyped up by way of thirteen% – stating that the runner had completed the marathon distance after 22.Eight miles.
“Our checks have discovered some of the models from massive-call manufacturers that can’t be relied on the subject of measuring distance, so before you purchase, make sure you do your research to find a version that you could depend upon,” stated Natalie Hitchins, head of domestic product and services at Which?
Other results for the variety of miles reached before the tracker recorded the professional marathon distance blanketed:
Samsung Gear S2 – 36.2 miles
Xiaomi Amazfit Bip – 34 miles
Huawei Watch 2 Sport – 18.9 miles
A Huawei spokesman informed the BBC “man or woman runner variances” should have affected the take a look at effects.
“With regards to running indoors, as this unique check become finished on a treadmill,” he stated. “The set of rules of Huawei Watch 2 Sport calculates the user’s stride period from the acceleration sensor records while walking at special speeds.”

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