NAV Mode Not Working

Pilatus PC-12 NGX
Direct EGGW (Luton) to EHAM (Schipol)
Photo of “working” diplay below.

As a sidenote, it seems to be working now. Not sure what I did.

Is there a point where it “becomes avaialble” after takoff?

Edit: Is that what you mean, or did you need something closer?