iOS 13 now shows you a map of where apps have been tracking you

As you can see in the screenshots above, iOS 13 presents popup notifications when an app is using your location in the background. This is Tesla’s explanation:

And the explanation for the Apple Store app:

Apple says that you’ll get periodic pop-ups like this in iOS 13, giving you the option to continue to give a specific app background access to your location, or to change it to “only while using.” iOS 13 also includes a new option to allow applications access to location “just once,” as opposed to having to give constant access when using an app or continuous background access.

Source: 9to5mac.com