Editing Openai/691a5ca1-2b1c-8010-8cbd-8797f95aa8d9 (section)

==== Key truths: ====
* CMMotionActivityManager.startActivityUpdates does not wake a suspended/terminated app. It only delivers events while your process is actually running (foreground or kept alive by some background mode).Apple Developer<ref>{{cite web|title=Apple Developer|url=https://developer.apple.com/documentation/coremotion/cmmotionactivitymanager/startactivityupdates%28to%3Awithhandler%3A%29|publisher=Apple Developer|access-date=2025-11-17}}</ref>
* Core Motion history (via queryActivityStarting(from:to:to:withHandler:)) can be queried when your app is brought back, giving you up to 7 days of activity segments (including .automotive).devfright.com<ref>{{cite web|title=devfright.com|url=https://www.devfright.com/how-to-use-the-cmmotionactivitymanager/|publisher=devfright.com|access-date=2025-11-17}}</ref>
* BGTaskScheduler (BGAppRefreshTask, BGProcessingTask) gives you opportunistic wake-ups, not “wake me right at hour 4 of driving” precision. iOS decides when to run your task based on usage, power, etc.Apple Developer<ref>{{cite web|title=Apple Developer|url=https://developer.apple.com/documentation/backgroundtasks/bgtaskscheduler|publisher=Apple Developer|access-date=2025-11-17}}</ref>
* Background modes (Location, Audio, VoIP, etc.) are heavily scoped. Apple expects you to actually be doing that foregroundly-reasonable use case (navigation, fitness tracking, turn-by-turn, etc.). Misusing them just to keep the app alive is very likely to get flagged.Apple Developer<ref>{{cite web|title=Apple Developer|url=https://developer.apple.com/documentation/xcode/configuring-background-execution-modes|publisher=Apple Developer|access-date=2025-11-17}}</ref>
* Even with the newer “continued processing” style APIs in iOS 26, Apple is focused on user-initiated, bounded tasks (exports, uploads, etc.), not open-ended sensing like “watch for 4 hours of future driving”.Apple Developer<ref>{{cite web|title=Apple Developer|url=https://developer.apple.com/videos/play/wwdc2025/227/|publisher=Apple Developer|access-date=2025-11-17}}</ref>

So:

: 

Your current manual Start/Stop approach is actually very in line with what Apple wants: user-initiated, explicit, and bounded.