@Vrba007 Here’s the test I use to see if the compass is calibrated when I don’t know where North is.
Hold the watch level and let the red North pointer settle. Note the pointer’s direction and ideally line it up on a terrain feature.
Now rotate the watch in your hands and see what the pointer does.
If the pointer returns quickly to its original direction then that direction should be North and the compass should be calibrated.
If the pointer wanders around the edge of the screen before stopping at some arbitrary point then I assume it’s not calibrated.
Of course, you need to recalibrate every time you charge your watch, as the charging cable connects magnetically.