Hi bastien.bolota
We are sorry to hear that you are having this issue.
Does this issue happen to every app that requires GPS ?Which verion of the app do you use?
Was the phone connected to the internet in any way? WIFI or mobile data?
Please help testing your phone GPS functionality under safe mode.
In safe mode, only the factory pre-installed applications will be loaded.
For instructions, please refer to the link below:
https://www.asus.com/support/faq/1005163
Thank you:)