I got FR220 to replace my old FR610 for 6 weeks. one thing it seem to be different is that when I create custom workout such as
a long run 19km, at pace 6:03min/km with my FR610 the workout as attached screenshot work just fine. basically the watch will alert me if my average pace went lower or higher than the range I've set which is 5:50-6:03 min/km in this case.
with FR220 I think the watch is not using average pace to trigger alert. i'm pretty sure i'm running at quite constant speed for 19km in 113min. it really annoying that it keep alert me with 5:xx in red circle and 6:xx in blue circle. I guess it means i'm running too fast, too slow. since FR220 collect location every 3 sec current pace can fluctuate a lot. may be 220 alert is trigger with current pace? sometimes it alert me that I'm too fast/slower every 20-30s :(