Fenix 5 - Altimeter/Barometer Major Issues

Former Member
Former Member
Background:
I recently purchased the Fenix 5 watch around Christmas time. I live in Boulder, CO and do a lot of trail running, backcountry skiing, and general outdoor activities. I was a Suunto user for the past 5 years, but I wanted to give Garmin due to a variety of perceived upgrades. There are a lot of things I like about my move to Garmin, but a major issue seems to be surfacing regarding elevation reading and tracking. For the past few weeks I was under the impression that I didn't understand the Barometer/Altimeter settings and that this was likely the source of my problem. However, after trying different settings and reading information on these forums I've unfortunately concluded that regardless of what setting I have the elevation is simply never accurate.

Issue:
Inaccurate elevation reading and tracking throughout the day and during activities.

Most Recent Examples:
1) I calibrated my watch manually last night before bed. When I woke up, the elevation reading changed from approximately 5,300 ft to approximately -6,700 ft.
2) I calibrated my watch manually when I arrived at the office and since I have typed this message I've gained roughly 3,000 ft in elevation.
3) I went for a run and upon finishing my watch informed me that I gained roughly 2,700 ft when I know for a fact it was only 1,500 ft. This is really troubling since I'd hope that when GPS is on that the elevation would be accurate, but evidently this isn't the case.

On other random days I've looked at my watch and it has varied from -65,000 ft to 67,000 ft. I simply have no idea how it is even registering those types of elevations.

HELP!!!! This is a very frustrating issue. Am I correct to think my only option is to send the watch back to Garmin and hope to receive a replacement that has functioning sensors?

Any thoughts or suggestions are appreciated.
  • I'm familiar with how buildings are pressurized and it's affects on a barometric altimeter.

    ...and it is not a large effect.

    I have measured ambient pressure on both sides of a door, which had so large pressure difference that the resistance could be felt when opening the door. The pressure difference was still only a few tenths of a millibar. One millibar is equal to 8-9 meter, so the pressurizing of the building would only give an error of a few meter in that case.

    Regarding changes in ambient pressure measurement, caused by temperature (assuming that there was no real change in ambient pressure, of course):
    I would consider that an error of the watch. Users have a right to complain about that.
  • Former Member
    0 Former Member over 6 years ago
    Regarding changes in ambient pressure measurement, caused by temperature (assuming that there was no real change in ambient pressure, of course):
    I would consider that an error of the watch. Users have a right to complain about that.


    I would agree, especially since your wrist temperature far outweighs the ambient air temperature when it comes to the temperature of the device. I do a lot of hiking, which is my primary activity, and even when it is 0F out, the watch doesn't get much below 70F due to my body heat and typically wearing gloves or a jacket over the F5. In other words, the temperature swing on the device is typically small relative to air temperature, and if that small change is enough to throw off elevation by 100s of meters, there is certainly a problem. Especially since the little sensors usually come pre-calibrated for this.

    Again, with that said, my F5 has never had a problem with elevation, whereas my older VivoActive 3 certainly did. In that case I was 90% certain it was a software flaw. That is why I did not go back to the VA3 after having lost it.

  • Former Member
    0 Former Member over 6 years ago
    Is there any way to display the real ambient pressure, and not the calculated sea level pressure?
  • Is there any way to display the real ambient pressure, and not the calculated sea level pressure?


    Yes, you can enable the ambient pressure datafield within an activity. It is in the last group of data fields, together with time of day and other stuff.
  • Former Member
    0 Former Member over 6 years ago
    Thanks.
    That worked
  • Former Member
    0 Former Member over 6 years ago
    Hi have a Fenix 5S, which I used for a short ride today (normally I use a Garmin Edge but the battery was low). The elevation gain is under 100m overall. At the end of the ride I found I had climbed 1472m (4830ft) in the last 25 minutes! I also had a Netatmo device at home, but the pressure had only risen from 1020.3 to 1020.4 during this period! Something's wrong!
  • I have a Forerunner 935 that was having the same elevation gain issues. My last track workout read over 2900 feet of elevation gain. Turns out the barometer broke and Garmin issued a replacement even though I was 4 months outside of the warranty. Apparently, the barometer has a diaphragm that must be sensitive to salt or skin debris or something which effects it's performance after some time. Mine started having issues after about one year of wearing daily. Super happy Garmin covered the replacement.
  • Former Member
    0 Former Member over 5 years ago

    Hi All! bringing this thread back up to see if anyone knows i this altimeter issue has been resolved? i'm thinking about buying a fenix 5s and i certainly don't want to if the altimeter is still a big problem! 

    Thanks in advance,

    Michelle