Here is a preview of a replica I have done from a WW2 U-Boat wiz-wheel:
I'd very much like to adapt this graphics to your fabulous tool, gutted
The outer black one is the yellow compass card, the inner white one is the target wheel. The red pointer is here the large squared one with arrows. This one has a one wheel less than the one in your tool, as it works with true bearings, not with relative ones.