How Does Heart Rate Dynamic Source Switching Work?
Dynamic source switching is available for all activity types to provide seamless heart rate data if the heart rate strap becomes unavailable. The biggest benefit of the feature is for running activities. A heart rate strap is usually the most accurate source of heart rate data for running but occasionally there can be inaccurate heart rate at the beginning of runs, often referred to as start-up noise. This is caused by poor connection between the skin and the electrodes and typically resolves once you start to sweat. With dynamic source switching, when a heart rate strap detects low signal quality, heart rate from the optical heart rate sensor on the watch is displayed and logged instead. The heart rate strap remains connected to the watch and the heart rate source will automatically switch back to the strap once the signal quality improves.
I'll probably hold off for now and disable this new feature. Previously it performed quite poorly on more expensive models. Write if this is not the case and for whom it works as it should.
I’ve tested and can confirm that the watch will record Chest Strap HR even if there is no activity being recorded and/or you aren’t even wearing the watch (but are in BT range). However (while not recording activity) the Time watch face does not display Chest Strap HR, but the HR App does.
