Only applicationWillResignActive called when iPhone shuts down?

Hallo experts,

I've tested what's happing with my app when the iPhone is switched off while the app is active. For this purpose I logged the callback methods of the app's lifecycle in the xcode debugger console.

iOS Multi-Tasking Track GPS Location

I was just wondering if it was possible to make an iOS app that would track your location via GPS while it was in the background.