Following a railway line in southern Germany headed N-S, forgot to look outside for a while and when I did, no railway line. Took some significant back tracking to see where it had turned 90 degrees and entered a very long tunnel. So back to the old adage, I wasn't lost because I knew I was in Germany, probably Bavaria, hadn't yet crossed the Alps, so I had a good stair rail check feature. Lost, certainly not - did I know where I was - not in the slightest.