If anyone is working on a future version of ANRB:
What about including a feature that will allow annotation of outlines, the positions and direction of which can be altered. Something like the degrees that are in the Radar Rings.
Motivation:
Operators that listen to the air band would be able to see the boarders of the different radio frequencies and be able to identify them as: ATC Approach; ATC Tower; ATC Ground and so on, like they are on the aeronautical charts.
There could be many other uses for such a feature.