Compare HRM-Pro with internal Epix 2 HR sensor

Azo said:

How can I compare HRM-Pro data with internal Epix 2 HR sensor?

Export the activity file in the default FIT file format, load it to FIT File Viewer, click Chart at the top, select "wrist heart rate" for Y1 and "external heart rate" for Y2

Thank you, it looks that the external HRM-Pro is just recorded and not used for activity evaluation. Under Stats in Activity details is shown the WHR graph and not the HRM-Pro graph. It means the HRM-Pro is useless. 

Is there a setting to force the watch to use the external HR for calculations? 

Sounds strange. The external HRM has always the priority, as long as it transmits credible data. However, if you disable the option "Source Switching" in the settings Sensors & Accessories » Wrist HR, or if you disable the wrist HR sensor (i.e. by activating the Jacket Power Mode in the activity profile), the watch will use only the external HRM.

This is the superimposed WHR and HRM. Next is the HR graph from the activity Stats. it is clearly the WHR.

In the Activity Stats is shown the WHR. And this is what is considered for Activity evaluation. 

Sounds indeed strange.

You can also select "wrist heart rate" and "heart rate" (instead of "external heart rate") in fitfileviewer. The option "heart rate" is what Garmin Connect then shows, so you can see whether it is 100% identical to the wrist HR, or whether there is some influence of the external HRM, anyway.

"Wrist heart rate" and "heart rate"are identical. External HR is clearly different.