Congestion markers

[Xerxes77]

This was in the FWWC series, there was not much air recon available in 1914, but I suppose you can suggest it is possible to be spotted from the air.

Although a counter argument is that you would see it even if it was completed on a night turn! 

Its just one of those abstract features that all JTS games seem to have.

I wonder if it's a feature or an oversight... When you toggle unit visibility, which I assume is intended to provide a better view of the terrain, all fortifications vanish too. This I found strange so I initially assumed the program just turned off the whole symbol layer, but clearly that's not the case (e.g., you can selectively turn off objective markers). My guess is that there's some kind of internal flag governing this and may need some tweaking.