The magnetic North pole is shifting but the magnetic South pole isn't . I don't think the compass readings in Australia would notice any change caused by the shifting magnetic North pole.
The Spark is becoming very famous for it's GPS unit failures . It indicates " Weak GPS " but it really means that the GPS is somehow sending bad data to the IMU. Unfortunately DJI doesn't want to admit that it's selling a product that's faulty.
I just bought my DJI Spark a couple of weeks ago . The first problem I had was that the SD card won't format. It still records video though. The second problem was that the remote controller bricked after it was updated. I don't trust the GPS unit so I've decided to use my DJI 550 Flamewheel to...
Unfortunately DJI doesn't want to admit that it's selling a product that has a faulty GPS unit. There's no problem finding articles that discuss the Spark fly aways .