At beginning of 2020, I’ll release next Dark Waters V3 with type XXI re-worked to match other U-Boats standards, new funnel smoke for all ships.
Funnel smoke will be different for cargos/heavy warships/destroyers (actually they are all the same)
So with some practice, you should be able to identify ships category just via smoke

...as it was in RL.
The graphical bug problem with type VIIB 2 (1942/1945) will be corrected also. Dunno why this type suddenly had problem, as nobody touched its files...the joy of computers ...
HAPPY CHRISTMAS TO ALL