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Apple Watch Ultra Elevation Way Off - I believe this is a software issue with the Watch Compass app

Okay. I live in Denver (5280 ft) have the Apple Watch Ultra with latest watch OS (9.0.2) and latest iPhone OS (16.0.3).

When I first pair the Apple Watch Ultra with my iPhone 13 Pro, the elevation is correct. This continues until I use the activity app (native to the Apple Watch) or Strava app, and immediately after that the elevation on the always-on altimeter will show ~ 9000 feet. It will not reset itself unless I unpair and then re-pair my watch with my iPhone.

If I open the compass on my phone, it is the correct elevation, and there is no way to sync compass on the phone with compass on the Apple Watch Ultra.

The only way to repair this issue is by comparing and repairing the watch to the phone, and then it will be correct until I again use the activity app or Strava.

Despite the altitude being in correct in times of absolute reading, it will register elevation gain at the end of the workout, which seems reasonably correct.

I also had issues after a commercial plane ride (reported by others), but I only noticed it after using the activity app, so it may have been thrown off by that and not the airplane’s pressurized cabin.

Other altimeter apps seemed to work fine. So I do not think this is a hardware issue, but rather a software bug with the compass app and elevation getting off sync after using the activity app.

I even had a replacement Apple Watch Ultra sent my way, and this issue is the same on the new device. Therefore, I think this is a glitch with the compass app that needs to be fixed in a Watch OS upgrade.


Does anybody know how I can let Apple know about this? How can I file this so that they can work on fixing their native compass app? Incorporating a calibration from iPhone to Watch OS compass override in the short term might help, and ultimately fixing the Watch OS compass would be nice.


Maybe they know about it, but I think knowing the sequence of events would be helpful.

Apple Watch Ultra

Posted on Oct 20, 2022 6:38 AM

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Posted on Oct 24, 2022 12:20 AM

Running into the exact same issue myself. I live in the metro Denver area and currently I’m showing ~9,158ft where my watch usually shows ~5,170ft. I’m reading up on an issue reported by a bunch of German Series 6 and SE owners from back in 1/2021. Apparently, the altimeter use by Apple is based off of barometric pressure and particularly low pressure systems throw the whole thing off—low pressure being an indicator of weather changes like storms. We’re getting the first winter storm in the mountains and got some of their leftovers this afternoon—got some very brief graupel snow that fell at my house this afternoon. I submerged the watch and the altimeter immediately reset to the usual 5,170ft. The effect was only temporary though—I noticed about 30min later that the watch returned to an altitude similar to that of Breckenridge’s base elevation (approx. 9,200ft.) Super bummer that Apple chose to incorporate such inaccurate tech in a watch intended for outdoor enthusiasts.

34 replies

Jan 13, 2023 6:43 PM in response to PGeorgeMD

I received an Ultra watch for Xmas hoping Apple really considered athletes this time! No such luck! First, the altitude feature rounds off to closest 1,000 ft! Aggravating when boarding steeps! (10k instead on 10,285!). Second, HR function is off by several beats, wear a strap to double check. Optic? Third, using the exercise function/selection for outside the normal selections as snowboarding is a fool’s errand! PS. Completed three Ironman comps under eleven hours at 50+, surf, lift weights, basically active!

Jan 21, 2023 7:04 PM in response to PGeorgeMD

Thank-you doctor for the workaround. I tried, the elevation is still rounding off to nearest 1,000’. It does show, on occasion, what I believe is the accurate elevation, very inconsistent if at all. Especially, while on the hill at Beaver Creek or Vail. Apple adopted the habit of curing channel issues with its Genius Bar. Certain the actuarial view is that dragging users into the stores with reservations is less expensive than redesign. It’s is design issue as is the optic HR function.

Feb 4, 2023 7:28 AM in response to PGeorgeMD

You do realize that all this babbling just adds to what is a fool’s errand! AAPL is not concerned with accuracy of elevation or HR! My Ultra frequently jumps up to ~165 HR while boarding or runnings or cycling only to correct when I use the HR function button that displays accurate HR of -105! I’ve tried the exercise function, the same type of fluctuations! They can say the band needs to be adjusted; however, the accuracy improves as stated above without adjustment! The reduction is that the watch needs an overhaul and future tests with athletes!

Apple Watch Ultra Elevation Way Off - I believe this is a software issue with the Watch Compass app

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