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Analysis of Apple Watch running data

applewatchrunner.substack.com

41–50 of 171 posts

Re: Analysis of Apple Watch running data

#41
post #27

From a discussion on Garmin nav accuracy: > Russia (GLONASS) may intentionally give wrong results in your area. Try switching to just GPS, or GPS & Galileo. https://www.reddit.com/r/Garmin/comments/vo9w0l/comment/ied5...

If you read down in that thread it turns out it was nothing so mysterious; the ephemeris file for Sony gps chips was expired and had to be updated.

Re: Analysis of Apple Watch running data

#42
The watch needs updated GPS ephemeris data to accurately calculate the position, received by an aGPS (Assisted GPS) server (over IP) or by satellite. This takes at least 30 seconds by satellite.

Solution: Tether with IPhone before leaving until fix is achieved, otherwise keep watch outside or near a window for 10-15 minutes before running so that it can update its almanac from overhead satellites and get a fix.

There is no software solution. Buy a newer watch with cellular connectivity and aGPS-support.

Re: Analysis of Apple Watch running data

#43
post #12

Earlier quoted context omitted.

Weird hill to die on with Apple. That's a 10 year old issue with an iPhone 4, said by a CEO that is long dead. They gave everyone free bumpers, because sweaty fingers would close the antenna gaps. The statement was true, the gaps were placed where they were expected to least affect the grip. What exactly would you expect in this case? The messaging worked. If your iPhone 4 was having signal issue, consider readjustin…

The problem is that it exposes exactly the rhetoric that people hate from Apple. They're genuinely incapable of admitting when they're wrong, which is unfortunate since they make so many opinionated decisions. It's about as asinine as when Nintendo shipped Mario Party owners a free pair of gloves instead of admitting that their minigames encouraged skin irritation. It's pure posturing, and hardly a solution. You're w…

> The problem is that it exposes exactly the rhetoric that people hate from Apple. […] It's about as asinine as when Nintendo

So, you admin Apple isn’t the only one. I think you can find examples from any company, especially the publicly traded ones.

Similarly, you’ll never hear a CEO say their new product is decent while the previous one was so-so. The new one always is better, and the old one doesn’t get mentioned, but is implied to be good.

> this is the sort of behavior that will be heavily scrutinized during antitrust hearings.

I doubt it. Even if Apple were exceptional in making this kind of statements, what’s anti-competitive in making them, or in making bad products?

Re: Analysis of Apple Watch running data

#44

Assuming it is an aerboic work out, what's the difference if the watch tells you that it's 9.6k, 9.7k, or 9.8k? The only thing that I need to know the accurate distance is to train a specific event, e.g. mile run, 5k, or 10k. If I train to run a mile within four minutes, all I need to know is to run 60s for each 400m on track.

>Assuming it is an aerboic work out, what's the difference if the watch tells you that it's 9.6k, 9.7k, or 9.8k?

If you're tracking incremental progress than such variability makes the data less useful. But that's why I prefer to use natural landmarks and a stopwatch - the smart watches I've used so far are off to the point where I don't trust them.

Re: Analysis of Apple Watch running data

#45
post #28

Earlier quoted context omitted.

> I wonder if the dual-band GPS on the Apple Watch Ultra is an attempt to fix these problems? The author said their watch worked fine in the past. It also works fine after a warm up period, which suggests it’s not getting a GPS lock at the start of the workout. It’s a new issue of either a software regression, hardware degradation, or RF interference near their start point.

I thought this was a well known issue with the Apple watches? They only start looking for a GPS fix once you start the workout, which is the worst time since, well, you already started the workout and are running, making getting that fix that much harder. I think the Ultra watches now have an option to wait for a fix before starting (which is what always happens on the Garmin's).

Apple Watch uses the iPhone’s gps when the phone is close by.

Re: Analysis of Apple Watch running data

#47
post #30

I have never seen and cannot find the pace graph the author shows as a screenshot from the fitness app. Would love that data. Just spent 10 min googling and gave up. Reminds me of this thread from yesterday https://news.ycombinator.com/item?id=32965288

In iOS 16 it’s tap on the workout, then anywhere under Workout details and scroll a bit. That is really no discoverability issue, because there is even a show more button next to it, that has the same function.

But maybe it changed on iOS 16?

Re: Analysis of Apple Watch running data

#49
post #33

Does anyone know how OP exported this data? I want to see if my watch has the same data quality issues

Open health app and press on your profile picture in the upper right corner (scroll to the top). Then scroll down and press export all health data. Also OP mentioned the exported XML has some errors in iOS 16, so beware of that.

Re: Analysis of Apple Watch running data

#50
post #5

I’m part of a running group with a mix of Garmin and Apple Watches and the Apple Watches always have pretty different distant readings according to Strava, maybe 2%-5%. The Garmin devices are generally much closer together. I wonder if the dual-band GPS on the Apple Watch Ultra is an attempt to fix these problems? I would guess that it’s software, with the author, if for no other reason than I’d be surprised if Garmi…

> I wonder if the dual-band GPS on the Apple Watch Ultra is an attempt to fix these problems? The author said their watch worked fine in the past. It also works fine after a warm up period, which suggests it’s not getting a GPS lock at the start of the workout. It’s a new issue of either a software regression, hardware degradation, or RF interference near their start point.

I have just started using an Apple Watch Ultra for running and it does seem more accurate to me. My old Series 6 would underreport distance, e.g. a 5k park run would be measured as 4.9km. I also noticed with the Series 6 that if I did a u-turn that my pace would drop considerably as the watch was presumably missing some of the distance I had travelled whereas the Ultra seems much better in this regard.
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