Heart rate gap at start activity / gps accuracy

I confirm significant GPS inaccuracies with the setting for maximum accuracy – recording every second, multi-band, and all satellites... :((

Could Garmin please look into this? Garmin-Laurie

Do You use external HRM? I have similar issues when using hrm, I suspect "source switching" causes problems as I did warmup before run and HRM reported much higher heart rate than watch recorded at first minutes. 

Workaround: download hr from hrm at end of the workout if hrm supports this 

Before dl:

After dl: 

(GPS, on the other hand, works fine on my e3) 

The delay in accurate HR recording during an activity is well known across many if not all recent Garmin models. As with you, my Fenix 6 Pro recorded HR accurately from the start of a workout. My Epix Gen2 does not. Or rather, sometimes it does, often it doesn't. A hard reset sometimes fixes it (temporarily), sometimes not. This is a problem Garmin created somehow and, rather than fix it, has resorted to claiming it is a feature of the watch. We users are, presumably, expected to applaud this new feature. I can't yet bring myself to do so.

7017726 said:

This is a problem Garmin created somehow and, rather than fix it, has resorted to claiming it is a feature of the watch.

Where? AFAIIA Garmin have responded well to people who have contacted them about heart rate issues.