I saw today that my light rail trip had two different portions where the trip line randomly snapped off of the tracks and ran along the parallel roads before snapping back. I’ll attach photos but is that Arc or the GPS doing that?
Could also just be a weird coincidence
That’s very strange! Arc / LocoKit2 don’t do any road snapping. In practice it’s very rarely helpful, and almost always just makes things worse.
Though in one of the iOS 26 (or possible iOS 18) betas I did see iOS doing road snapping on its side, sporadically. Which was a worry, because there’s no way for apps to opt out of that.
Which iOS version are you on? I just updated to 26.4 this morning myself. I wonder if Apple are experimenting with doing automatic road snapping in 26.4. Though I really hope not! But those screenshots do look very much like road snapping 
I haven’t updated yet so I’m still on 26.3.1
I’m home now and went back to zoom the rest of the day. I found two more suspicious lines.
Probably irrelevant but I’m in the NYC metro. I don’t know if Apple ever uses us as guinea pigs
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Yeah those both look highly suspicious. If it’s not snapping to roads, it’s managing to coincidentally look very much like it.
Hmm. Not sure what we can do about that. Road snapping isn’t something Apple expose as a Core Location feature. The closest might be the manager’s “activityType”, which can be set to automotiveNavigation, fitness, otherNavigation, airborne, or other.
None of the explicit ones are suitable for Arc, which is an everything app. So I leave it on the default “other”. Perhaps iOS is foolishly trying to self adjust it and choosing automotiveNavigation*.*
But given we’re already told it we want “other”… there’s nothing else we can do there.
Hmm. At this point I guess we just have to hope it’s short lived, and goes away on its own. If it sticks around I might have to escalate it to Apple.
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