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Elevation all whacked on Garmin 935
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I have a new (Jan '17) Garmin 935 that all of the sudden the elevation, on both runs and swims is all messed up. At times the elevation shows "0" and at times it shows 1600+ft when running on a flat surface. I contacted Garmin who sent me an email with a tip to re calibrate, which I did and no change. They also said soak in soapy water...which I did and no change either. They did say that if it continues, they would replace. Which is great, just frustrating and additionally I have heard of others with same issue. Have read that chlorine can be the cause, although no evidence to support and have a difficult time believing this, given the intention of this watch.

Although a nice gesture to replace, I have concerns that it will happen again.

Anyone have similar issues and able to fix without sending back? I know best to send back, I know, I know...but damn, seems like this shouldn't be happening.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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Yep, my 2017 935 does the same thing. I haven’t done anything with it as I don’t really care about elevation data anymore

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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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I've been having the same issue. I would do a simple 4 mile run in my neighborhood which is super flat and my Garmin would show a 600ft elevation gain. I called them and they told me the same thing...soak it in soapy water, send it back, etc. Didn't really want to send it back so I dealt with it, but it was frustrating.

One day I was on the Garmin Connect website looking at one of my activities. Near the picture of the watch there's something that says "elevations correction." On mine it said disabled. I enabled it and elevation was corrected. My 4 mile neighborhood run went from 600ft of elevation gain to 96ft. I can't figure out how to do it on the app and I have to do it for every activity. I'm sure there's a way to set it as a default; I just haven't figured it out (maybe someone else knows).

The one thing I can never get to work is the temperature. I can never get it to read and if it does it shows 72 degrees for the entire workout.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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If you swim or shower with the watch, it will happen again.

get comfortable being uncomfortable
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Re: Elevation all whacked on Garmin 935 [stevej] [ In reply to ]
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This is a known issue to Garmin. Their 8.0 software updated F*d up the watch somehow that can't even be fixed by downgrading the version, beginning mid-March. Garmin support will give you the "have been swimming with it, and do you soak it" routine, but it's their fault. Elevations come out randomly doubled or tripled. When my 920xt lost the barometer, everything read as 32,000 feet. And I cared, because that kind of causes my effort to look awesome, but makes my training numbers all wrong.

Anyway, they have just RMA'd both my 935 and my wife's 935. Look on the Garmin forums for "elevation and temperature data is screwed on 935".

I'm closer to the feathered end of the spear than the point.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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I don't think this is unique to the 935. There were lots of reports of issues with the 920, too.

I have a 920. So far I have not had the issues YOU describe (0, 1600, 0, etc). However, I do get skewed altitude readings when I go from inside to outside quickly. I can see the "right shape", but it loos slanted. Like my whole run was on a hill instead of an out and back. I can see where the "normal" peaks are still. However, I find that if I've been outside for a while then the altitude curve looks about like the "corrected" curve, and I usually don't bother with the correction. I don't remember having this problem last year (same watch), but it has been consistent since the outside temps have been in excess of indoor temps (aka summer).

I assume this has something to do with a temperature correction factor that either isn't working right, or that the 920 doesn't have. I never really looked into the inner workings of the 920 altitude.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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This was a widely reported issue with the 920xt, which I've experienced also. Garmin was good about warranty replacement. My best guess was that it was caused by salt build-up from ocean swims, but it's possible it was chlorine from pool swims, or something else. I don't know whether it's technically feasible to design a barometric altimeter that wouldn't be susceptible to similar issues, though.
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Re: Elevation all whacked on Garmin 935 [Tom_hampton] [ In reply to ]
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Tom_hampton wrote:
I don't think this is unique to the 935. There were lots of reports of issues with the 920, too.

I have a 920. So far I have not had the issues YOU describe (0, 1600, 0, etc). However, I do get skewed altitude readings when I go from inside to outside quickly. I can see the "right shape", but it loos slanted. Like my whole run was on a hill instead of an out and back. I can see where the "normal" peaks are still. However, I find that if I've been outside for a while then the altitude curve looks about like the "corrected" curve, and I usually don't bother with the correction. I don't remember having this problem last year (same watch), but it has been consistent since the outside temps have been in excess of indoor temps (aka summer).

I assume this has something to do with a temperature correction factor that either isn't working right, or that the 920 doesn't have. I never really looked into the inner workings of the 920 altitude.

I get something similar with my 920, usually on morning runs. I have an out and back 5k that's a gradual 100' uphill to the turnaround, but often the 920 shows me as starting 200' higher than the actual elevation, going level or slightly downhill to the turnaround, and then about 200' downhill on the way back...

"I'm thinking of a number between 1 and 10, and I don't know why!"
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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I'm on my third 935. First was a warranty replacement due to altitude meter / thermostat failing. Second was a crash replacement where I chatted with the support guy for a while. He said chlorine kills the protective membrane for the thermostat/barometric pressure sensor (altitude). He recommended rinsing the watch after every pool swim to let it last longer.

https://www.strava.com/athletes/nbrowne1
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Re: Elevation all whacked on Garmin 935 [Tom_hampton] [ In reply to ]
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I have the same problem with my Fenix 3 HR from 2016.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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I had to return my 935 for the similar issue when the barometer failed in April. Garmin support was excellent and I had new watch in a few days. You can restart your 935 in debug/test mode and find various test screens as shown in the attachment:
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Re: Elevation all whacked on Garmin 935 [niccolo] [ In reply to ]
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I had my 920xt replaced under warranty for wonky altitude data after about a year of ownership. But I'm a duathlete - that watch was never in salt water and I never went swimming with it in a pool or otherwise. Still, wonky-ass and replaced.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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Chiming in to report that I'm having the same issues with my 935. Garmin Support was no help either. Very frustrating.
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Re: Elevation all whacked on Garmin 935 [JonathanNYC] [ In reply to ]
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My F5 has the same problem. It’s stuck at 26k feet. I pretty much Everest every run and ride now. But I don’t care about elevation except at races but I use my Edge520 for that.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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I have three Garmin devises and not one of them is close to the other as far as elevation. Chalked up as poor Garmin software.
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Re: Elevation all whacked on Garmin 935 [David_Tris] [ In reply to ]
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David_Tris wrote:
Anyway, they have just RMA'd both my 935 and my wife's 935. Look on the Garmin forums for "elevation and temperature data is screwed on 935".

Both my wife's and mine are having the same 0 or gigantic elevation gain issue. Mine is RMA'd for a different issue at the moment. Might do the same for my wife's 935 later.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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I was thinking of buying a 935/F5 so I could use the Garmin running power, glad I didn't.
Guess the 735 w/Stryd is a safer bet.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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Has anyone tried to update the firmware to "beta v8.99" and see if it would resolve the issue?


Forerunner 935 software version 8.99 Beta
as of May 11, 2018

https://www8.garmin.com/...details.jsp?id=11751
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Re: Elevation all whacked on Garmin 935 [tie3] [ In reply to ]
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tie3 wrote:
Has anyone tried to update the firmware to "beta v8.99" and see if it would resolve the issue?


Forerunner 935 software version 8.99 Beta
as of May 11, 2018

https://www8.garmin.com/...details.jsp?id=11751

Just to answer my own question. No, v8.99 beta firmware didn’t fix the problem. :-(
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Re: Elevation all whacked on Garmin 935 [Tom_hampton] [ In reply to ]
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This is definitely not a new issue for Garmin. I have a Fenix3HR with the same issue and I know people with 910 and 920 that have the same issue. In the past I had great success with Garmin customer service but this time was very frustrating.
As of now before a run where I care about elevation i will manually calibrate the altimeter with GPS and 95% of the time it holds up for the length of the run (sometimes even a few more after). Based on history I would not expect this issue to go away any time soon.
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Re: Elevation all whacked on Garmin 935 [rdros] [ In reply to ]
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I do a lot of pool swimming, mine is also wacked.
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Re: Elevation all whacked on Garmin 935 [jonnies] [ In reply to ]
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Mine did the same thing
I had it replaced
Kind of crazy they are basing the altimeter readings on the barometric readings fit this watch ( that’s the way they explained it to me )
Seems lots of the other versions have good altitude readings with no barometer
I thought cleaning my 600 watch in soapy water to get a basic function to work seemed crazy
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Re: Elevation all whacked on Garmin 935 [simsburytri] [ In reply to ]
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When a barometric altimeter works, it is way better than a GPS based altitude.

It would be cool if you could hit a menu option to change to GPS when the barometer goes bad.
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Re: Elevation all whacked on Garmin 935 [dfroelich] [ In reply to ]
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Has anyone experienced this problem in relation to using the garmin running power?

I know in order to use their power you need the running dynamics chest strap or running pod and the altimeter/ barometer has to be working.
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