Garmin smartwatch users have raised concerns about the new heart rate dynamic source switching tool. The feature arrived for beta testers earlier this year and is now rolling out in stable updates for models like the Forerunner 965 (v19.18) and the Fenix 7 (v17.20). A complete list of compatible smartwatches can be found on the company's website.
The heart rate source switching feature has been designed to improve the accuracy of heart rate data captured during exercise. It works for users who wear their smartwatch and an eligible Garmin heart rate monitor strap simultaneously, with the source of the heart rate data said to change dynamically in situations like a drop in connection. However, several Garmin smartwatch users have taken to the forum to flag issues with the new tool. A few wearable owners indicated that the tool was causing the watch’s battery to drain faster than usual.
Others said that data collected in the first 20 minutes of their workout was erratic, or they observed abnormally high spikes. Garmin does note that heart rate data can be inaccurate at the start of the run due to a poor connection between the skin and electrodes, which is resolved when you start to sweat. Despite this, several users suggest that this issue with inaccurate heart rate data at the beginning of a workout is worse with the new dynamic source switching tool. Some Garmin smartwatch users may be pleased to learn that you can switch off the dynamic heart rate source tool, a feature that appeared in beta releases like v19.13 for the Forerunner 955. You can find instructions on how to do this in the screenshot below.
Source(s)
Garmin, Garmin Forum (1) (2), Gadgets & Wearables