Trying a bluetooth GPS...

[Giox040]

On my Redmi note 7 I tried to use OruxMaps beta with an external Bluetooth GPS, from "Tracks", "Start external GPS".
It seems to work fine but about every 30 seconds I hear a notification sound on the phone. This is not the lost signal notification, because
i set a different sound. What can this notification mean?

Also, using "Start external GPS", the "GPS test" and "GPS status" apps don't work, I tried to use the "Bluetooth GPS" app (which I used years ago) to activate the dummy positions but without success.
Can anyone recommend me an alternative app that works with Android 10?

Thank you in advance