native navigation apps do loose track of current location when display gets dark.
not immediately but after few minutes
recently i 've found out that android apps run nicely without screen
this is handy, e.g on motobike i can use magic earth for a complete day without charging.
also in car on highway i do need the screen on for hours …
so here my question: why does it not work for native apps ? is it an app or os issue ?