Indicator in Navigation mode not working properly

What is the little indicator (arrow) in the top right corner supposed to show, when navigating?

> Where north is?
> In which direction to go?
> Direction of trailend?

For me this indicator seems to be moving in a completely arbitrary manner since I have the watch.
Hence I have no idea what it all about and it seems either like a bug or hardware defect to me.
Compass is calibrated and usually pointing in the right direction, when in ABC mode.

SW Version: 2.60.

Best, ciq.forums.garmin.com/.../1441825.jpg