ChillPascal schreef op donderdag 13 januari 2022 @ 10:54:
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Zoals al vaker werd gezegd kreeg ik razend snel een reactie. Hierbij het mailverkeer.
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Dit was daarop zijn eerste reactie:
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Omdat ik toch nog het gevoel had dat hij het niet helemaal begreep nog een reactie teruggestuurd met de onderstaande afbeelding
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[Afbeelding]
En zijn (voorlopig) laatste reactie:
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Tldr;
De developer verwacht dat het combinatie van GPS-bereik en smoothing door Apple is. Het is voor 3rd-partij apps niet mogelijk om te schakelen tussen het GPS-signaal van de Apple Watch of de iPhone. Schijnbaar wordt het signaal van de iPhone geforceerd.
Ik ga binnenkort in ieder geval even enkele tests uitvoeren op hetzelfde moment om de weersinvloeden uit te sluiten. I'll keep you posted.
We zijn onderhand een stapje verder. Na het delen van de GPS-signaal gegevens en een wkt-file schrok hij toch wel enigszins. Het GPS-signaal is namelijk uitstekend, maar de route is simpelweg niet juist. Het lijkt daarbij ook locatiespecifiek, wat wel opvallend is. Daarbij heb ik gister nog enkele testst uitgevoerd. Wat blijkt; de connectie met de iPhone lijkt het probleem. Bluetooth uitschakelen is hierbij niet voldoende, maar het uitzetten van de iPhone lijkt de oplossing.
Nu hopen dat hij de issue ook kan oplossen in de app. Gezien de default workout-app er geen lijst van heeft.
Hieronder een afbeelding van mijn tests van gisteravond.
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Voor de geïnteresseerden hierbij ook de laatste communicatie.
Hey Ian,
Thanks once again. Ah didn't know the app recorded the GPS-signal strength, but I think the results are clear. The GPS-signal seems excellent during the workout. See the image below.
I'm not sure what the large collumns mean, but everywhere I track the accuracy seems to be <4m.
What do you think? Does this mean anything to you?
I'll try again tonight with three different settings:
Workoutdoors on Apple Watch, along with iPhone Bluetooth ON
Workoutdoors on Apple Watch, along with iPhone Bluetooth OFF
Default workout-app on Apple Watch, along with iPhone Bluetooth ON
I'll be in touch with the results.
Pascal
That is strange. Usually when the GPS is off track as much as it was then the reported accuracy is poor.
Are you using the latest iOS and watchOS software? I haven't seen that bad a track with a reportedly high accuracy signal for over a year. It used to be quite common a year or two ago to see that when the watch was using the iPhone GPS but I thought that Apple had fixed that.
If you are using the latest iOS and watchOS then please reboot both devices before trying again. That often fixes strange problems.
Also if you are planning to try with the iPhone Bluetooth switched off I recommend actually switching the whole iPhone off just in case. If that works then try with just the Bluetooth off. In the past the watch could use the iPhone GPS even if Bluetooth was off so I worry about Apple allowing that again.
Please can you also send me the wkt file for that workout. To do that tap the Export button 3 times quickly. I am interested to see what the rest of the workout looks like.
Thanks,
Ian
Hey Ian,
Thanks for your responds. I'm kind of relieved you also see an issue, that's not due to a poor GPS-signal.
Both the devices are running the latest software. I'll give all the options you mentioned a try. Hopefully I can come back to you with the results this weekend.
Attached you find the wkt-file. Do you see anything out of the ordinary?
Pascal
Hi Pascal,
Thanks for that. It looks like that place is the only problem. Apart from that the workout looks normal.
I wonder if the problem is location specific. I have seen this a couple of times before, especially when using the iPhone GPS. It works fine except for in one particular location. Apple's tidying up is probably compensating for it (maybe by snapping tracks to known roads).
My assumption is that there is a problem with a WiFi router or maybe even a cell tower having the wrong location. The phone (and the watch) use location information from such devices to help the GPS (something called Assisted GPS). The phone doesn't have to able to connect to the WiFi - it just knows its location.
Such WiFi routers are another reason to switch the whole phone off when testing. If you do have access to a WiFi router in town (maybe a coffee shop or pub etc) then the watch and phone may both connect to that and decide to briefly use the GPS from the iPhone.
So, as well as trying with the iPhone switched off, it would be interesting if you only see the problem there or if you also see it elsewhere.
Thanks,
Ian
Hi Ian,
Thanks again for thinking along with me on this issue!
If I check other workouts they seem to be fine. The minor hick-ups in the trail can be explained by visualizing the raw data instead of smoothing. I doubt a WiFi router is the problem, since it's an industrial area in my neighborhood. I know for sure that my iPhone isn't connecting to any possible WiFi routes if there is even one in range.
I'll make some test runs tonight and come back to you with any results I'm getting.
Pascal
Hey Ian,
I didn't have much time yesterday, but I managed to do some test runs (on my bike). The issue seems to be related to the iPhone connection. With my iPhone and Bluetooth OFF the issue is still there, however when I turn my iPhone completely off the issue is resolved. See the image below:
image.png
I also attached the wkt-files for you to take a look at. Please keep me posted if you find anything that might resolve the issue. I would like to use the app, but also be available on my iPhone in case of emergency.
Anyhow, there are some other things I want to try to specify the problem, like turning off location, WiFi or Cellular on my iPhone.
Looking forward hearing from you.
Pascal
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