bigduke - kudos. That is the most succint explanation ive ever seen!
ElNull - refer this report (unofficially translated version from russian). it represents an lnav map shifted (sic map shift) flight path, as compared to geographic flight path. the aircraft crashed at the end of a mismanaged go around
https://skybrary.aero/bookshelf/books/3640.pdf
Unadulterated russian version
https://reports.aviation-safety.net/...735_VQ-BBN.pdf