The aircraft dropped into ATTI mode due to compass errors at 69 s, but it's not clear what caused them. That's most likely due to taking off from a magnetically distorted location, but there could be other causes, including a faulty IMU (less likely though).
After that it drifted since you applied relatively little stick input apart from climbing it to its maximum flight altitude. Looking at the rate of battery depletion and extrapolating to 15% and 10%, and then extrapolating distance in that time gives the following:
View attachment 27791
That suggests that it would have drifted out to between 10,300 m and 11,200 m before autolanding. Plotting that on GE gives the following location estimate (between the radials and the range rings):
View attachment 27792
Note that that is significantly further than
@Cyberpower678's estimate, but I'm not sure how he arrived at his.