I understand. I was confused initially by Tide's statement as I couldn't see how he would know he was out of LOS. There are not many LOS obstacles in his approach.
Curious how a building hex affects LOS. Take for example the hex just S of your unit on the rail embankment. Is the 250m-hex considered to be full of buildings and no LOS gets through. Or is it just the building graphics that block LOS such that some LOS through it is possible.