- Useless for cycling - somewhat correlated but the F5 missed all peaks
- Running seems somewhat ok - poor tracking within the first 5-7 minutes; much better after that. At times regular and optical track extremely well but the F5 is missing a lot of peaks
- Average HR on a run has an absolute difference of around 2-3 beats. Not much but the max is off by ten beats
- Recovery HR after activities is completely off as compared to my F3 paired with the HRM run. Example: F3 read a 30 beat drop, the F5 recorded a 5 beat drop
- Casual activities seem a bit random - one moment my HR is at 45 reading a book, then 70
I have tried various positions on my wrist. Does not seem to make a huge difference. Just want to get a feeling for how much can be expected from the optical sensor.