Unfortunately it seems like the best thing is to look around in the
property browser while playing with the radios and instruments. Reading in how the the navigation instruments are supposed to work, from say FAA's Pilot’s Handbook of Aeronautical Knowledge,
Chapter 16: Navigation (PDF, 36 MB), pages 22-31, will help a bit but might take a bit of experimentation and shorter navigation flights to fully grasp.
The next step is the
source code...