Mikhayl's funnel-smoke mod, adapting von Hesse's earlier effort, functions very well with NYGM 3.1 (I have now tested it), and makes it easier to detect those old coal-steamers.
The link for Mikhayl's thread is here:
http://www.subsim.com/radioroom/showthread.php?t=145450
Nice work by Mikhayl, it's an addition for NYGM that I can recommend.
Stiebler.