I've noticed a lot of references to routing your trip through scoopable systems. I have not been able to find that filter in the navigation panel. Am I missing something?
Yes, it means filtering the star types to only show O, B, A, F, G, K & M
Open Galaxy Map.
Click the View tab (3rd along).
Click the Map button (as opposed to Realistic).
Choose Star Class from the dropdown.
Untick the star classes until only O,B,A,F,G,K and M are ticked.
What you see on the map are the stars that you can scoop from.
You can use the same method to filter only the neutron stars and black holes by choosing "Non main-sequence".