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Anyone STILL having heart rate accuracy issues with their Fenix 6?

Former Member
Former Member

Hi all,

Super frustrated, but I am still having issues with my Fenix 6S and heart rate accuracy even with the 4.20 software update. I'm wondering if it's just me or what the deal is? I had a 5S Plus before this and had no issues doing the same activities so I really don't think it's user error. My heart rate hardly reads over 110 during really vigorous exercise when my heart rate is closer to 160+. I have tried wearing on the inside of my wrist, tried my other wrist with no luck. It consistently reads 80-110 bpm the whole time. I wouldn't have bothered to upgrade if I knew this was going to be an issue. I know that wearing a chest strap is the most accurate, but I don't like to have to wear it for all of my work outs and my old Fenix was totally fine as well as my apple watch before that. Any suggestions? 

  • Garmin is completley silent and doing noting about this problem. I dont know if that is the right strategy. People wont buy Garmim watch for 900 euros anymore

  • I first got a Xiaomi band which many told is so good and how awesome is and why to pay for Garmin. This was for my wife and I tested against the Edge 820 with chest strap and results were just hilarious. Then I got her a FR35 which is good enough. Not perfect, but not far away like Xiaomi was.

    Lesson learnt, then, that many just think what they see, is what is supposed. Maybe the only few that gets a Fenix will see the difference because they know how they should feel at the HR zone and the watch is showing something else. Now, if the watch was a FR, then more intended to an active person, then some more will complain. But this is a fancy watch too. Is like getting the BMW to show off and you really think you have the fastest car around, not just a luxurious one. You'll not go on Dyno for tests on your own, you just know it should be awesome.

    However, I hope, we, the ones who realize the measurements are wrong, we are not such a few to be interesting for Garmin.

    @Garmin, why not adding the option for Ultra FullHD 4K 8K HRM in and not in activity as an option, even if this will halve the battery in half. It will still be better than less than a day of an Apple Watch.

  • This from last night on a cycle trainer. Some small differences between the strap and the wrist but negligible overall.

  • I've had a new Edge, Forerunner, or fenix every year of the last decade (probably longer). The fenix 6 HRM issues finally pushed me to pick up a Polar Grit X instead of waiting for this silence to end. I won't be buying any more Garmin.

  • What is the trick you did?

    What was the activity selected in the FR6 for this?

    Have you used the best practices by keeping upper on the wrist or it worked even by not caring where it sits?

  • Former Member
    0 Former Member over 5 years ago

    It's total pants:

  • Put this in another thread but figured I should drop it here also.

    Used the new widget to calculate the difference between a strap and the OHRM on the F6 this morning during strength training. It clearly shows that the F6 simply cannot catch rapid increases and decreases in HR. I know strength training is challenging, but like I said previously, my old AW2 did much better than this. I am not looking for perfection, but this is simply unacceptable for an $800 watch! Especially when cheaper competitors perform much better.

    Data from F6 OHRM

    Data from Wahoo strap.

    Difference in the F6 OHRM and the strap. The F6 reads low almost the entire workout until the very end where it starts to read 30 bpm higher? As others have said, it is almost a random number generator at this point. 

    I get that the watch is trying to "catch up" to the strap, but this is a major issue. It takes 20-30 seconds for it to even register an elevated HR and then it goes shooting by the actual rate. The biggest problem is it is never able to catch anaerobic training because it never catches the high HRs either during sets or right afterwards. 

    Edit: I should also add that I was doing strictly leg exercises this morning, so very limited wrist movement.

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    This won't ever get fixed.  The previous sensor with the 3 lights in a triangle didn't have these problems.  The Fenix 6 HR is rubbish.  Ruins all of the data.

  • guess which one works properly..

  • Former Member
    0 Former Member over 5 years ago

    The Fenix 5 uses the old configuration of 3 LED's in a triangle around the sensor.  It works very well.  And, you can pick up a 5 pretty darned cheap!