This is a simple question about Monitoring Significant Location Changes that don't seem to be clear in the documentation.
Could the location points generated by "Significant Location Changes" come from cached GPS locations generated for other apps?
The documentation specifies that "Significant Location Changes" relies on lower-power alternatives (such as Wi-Fi and cellular information) to determine the user’s location. Check documentation
Additionally, testing this functionality I found that the system could provide a really old location point to the app, a cached location point and I also found that a user could do some testing about that suggesting that the location could come from cached GPS location because the accuracy seem to improve while using other apps that generate GPS location point meanwhile. Check StackOverflow link