So I have posted here before, cause the heart rate on my vivoactive 4s is way off comparing to my old vivoactive 3.
Today I went for a walk, tracking the walk with the 4s and the a heart rate chest strap (synced with runtastic.)
Afterwards I combined the two heart rate curves and it's just poor as ***... but have a look yourself.
Is it just me or is it the new heart rate sensor of the 4s, which is just crap?
www.bilder-upload.eu/bild-9c6917-1572874435.jpg.html
Blue is Garmin, red is runtastic synced with the Garmin HRM-Dual.