I watched that Dubrovnik B737 crash episode of Air Crash; it was their worst yet and I won't bother watching the next one.
The reporter was on the right track in some cases but filled the layman viewer's head with utter garbage when it is supposed to be presented in a format to be understood by anyone.
The heading error on final cannot, as I understand it, be attributed to INS drift and he interpreted NDB or LOC "station passage" as passing over a marker beacon.
He kept on about something to do with being able to hear the beacon and he was not referring specifically to the ident, now was he referring specifically to a marker beacon. I have no idea what he really meant and neither did he.
For a program professing to "investigate" accidents, they have no clue.
That presentation has little relevance to Australian airline aviation.