Heart rate data from Garmin Fenix 7 often incorrectly received by Karoo3

I am recording my training data with a Garmin Fenix 7 Pro. The heart rate sensor is a Polar H10, which works mostly stable with the watch. I have paired the Fenix with the Karoo. I use the heart rate from the Fenix to show it in a Karoo data field.

I am observing during bike rides that the heart rate data transmission is sometimes way off from that of the Fenix display for longer periods. The graph below shows the rates from the Fenix and from the Karoo. Any idea, why that data transmission is partially wrong?

Is this an issue also observed by others or just by me?

LKerch

September 07, 2025 13:27
Edited

You may get a better result by pairing your Karoo to your Polar H10. I think what you are seeing is the difference between the sensor on your watch and your H10. This is quite common when comparing wrist based heart rate with chest strap heart rate. Since chest strap sensors such as the H10 are typically more accurate, pair that with both your Garmin and Karoo.

Heart rate data from Garmin Fenix 7 often incorrectly received by Karoo3

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