The fenix 5, 5S, and 5X have advanced features that are impacted by the output of heart rate variability. These features are HRV Stress Test, Lactate Threshold, and FTP estimates.
Not all 3rd party heart rate monitors provide the necessary HRV data. If you are using a 3rd party heart rate monitor you will need to confirm if it has the ability to output heart rate variability.
Garmin can only guarantee proper functionality of these features when using a Garmin heart rate monitor.
The fenix 5, 5S, and 5X have advanced features that are impacted by the output of heart rate variability. These features are HRV Stress Test, Lactate Threshold, and FTP estimates.
Not all 3rd party heart rate monitors provide the necessary HRV data. If you are using a 3rd party heart rate monitor you will need to confirm if it has the ability to output heart rate variability.
Garmin can only guarantee proper functionality of these features when using a Garmin heart rate monitor.