Originally Posted by jakubl

My Edge 305 did fine when I first got it but the past 20 rides or so, my heart rate reads crazy high numbers. Like 230s while I am warming up. I am putting water under the strap when I first put it on. I have tried wearing it upside down and wearing it on my back. Nothing seems to work. Sometimes it just does it the first few miles and sometimes it is the whole ride. Any suggestions?