I see that weight in KGs is tracked to one decimal point.
The mobile Garmin Connect App (on my iPhone) only displays it to 1 KG precision though. This looks just like a flat line at some periods, and not as useful or interesting as looking at the precision to 0.1 KG on the FitBit or Withings Healthmate applications.
(I have my Withings scales, via MyFitnessPal, auto recording my weight, and recently moved from a Fitbit, so familiar with these other tools.)
It would be very good if you think carefully about getting the KGs precision of display corrected - particularly in the Garmin Connect App, but also if possible the Forerunner 620.
If one weighed themselves on the scale, they are likely going to want to enter their weight to 0.1 KG precision - but the watch does not allow that.
thanks