I've just bought a Samsung Galaxy J6 and, naturally, the first app I downloaded was the geocaching app. But, I'm having a directional problem - the  map and compass don't rotate.  When I turn on the map, I would expect it to be automatically 'track up' but it is stuck - it isn't auto-rotating. If I rotate the map on the screen by touch, then a north-pointing compass arrow icon appears in the top left showing which way is true north -  all good. If I touch that north arrow icon, it dis