Just bough an Active 2 and so far am very disappointed with the accuracy of the HRM. So much so that I connected up my Polar M7 HRM chest strap only to find that the Active 2 will very often over-estimate by 10 beats a min and sometimes much worse. This especially seems to be the case at the start of a jog, my chest strap says my HR is, say, 120, but my watch has reported up to 170! I have tried re-positioning my watch etc but the result is the same.
Anyone else had this problem?
