1.7.62 Distance Measurements Off
I run frequently on a rail trail with measured 1/4 miles. Previously, when doing 1/2 mile repeats, my Spark 2 would measure .48-.50 for the interval, mostly in the .49-.50 range. Now it measures .42-.48, mostly in the .44-.45 range.
As you'd expect, there's a tremendous impact on pace for the interval, and since the Spark shows pace vs. split time for each interval, I thought I was getting slower, till I got home and checked the actual split times.