I still haven't returned my "recalled" fitness bracelet gizmo. I show no signs of rash.
Today I took it with me as my only gizmo on a long run. At the end it was estimating maybe 16.5 miles completed. It doesn't have a GPS, just a 3-axis accelerometer.
To check its estimate, I traced my route at the USATF Map-It site, which gave me 15.94 miles. Since I don't really run in perfectly straight lines on the road, that number was surely a bit low.
So, the gizmo is pretty accurate.
I run on the grass, I run on the road,
my path isn't perfectly straight.
I run around cars that are parked on the street,
and when there's a red light... I wait.
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