I have 2 Mavic Pros and both do not set home point and they give me a black box in the map window, not even the flight track line. This happens when I have no internet or phone data connection, despite having the map downloaded offline. What am I doing wrong? I have updated the Go4 app. I also had gimbal issues and the app froze on last flight without data connection. In addition, it takes a while for the phone to connect to the app. I tried both the small cable and the USB cable. Same results. I never tried turning off wifi or flying in airplane mode, could that make it work somehow? Thanks for any help.