...we noticed regular, large map shifts when flying in the Taiwan area. It transpired that the FMCS was locking on to a military installation, which was located on the back of a lorry and therefore moved! Maybe similar in Russia?
Is this life imitating art, said art in turn imitating life? Ernie Gann's "Band Of Brothers" describes such a scene, and it in turn was inspired by a real 727 accident.
...In Taiwan!