Non-Directional radio Beacon
the thing you tune your ADF in to!
i covered it during PPL studies, but ms flightsim taught me about it first and is just as good and if youve got any interest at all in flying, surely bill gates finest is a good investment?
by the way, those that have testing on the 18th, when did you submit your applications? did mine on the 20th dec, got the confirmation email and not a sound since.