Hi Rubini,
Thanks for your reply. On my current patrol I'm using your mod. I have just sunk my first merchant (an ore carrier). My WO spotted it at 5300 meters. Winds 6 knots NE, sky partly cloudy, light fog, daytime (around 2 pm). When the WO announced a ship was spotted, first I couldn't find it with the binoculars, but after a while (about half minute or so) it slowly slipped out of the fog and I started to see its contours and its smoke column.

(I don't bore you with further details: at the end the merchant went to the bottom of the ocean after my perfectly aimed two-torpedo salvo shot.

)
So my WO is a bit "eagle-eyed" but his performance is pretty close to mine. He is better than me maybe because I had no kriegsmarine training like he had.
So this far I'm happy with your mod. Thanks for it!
More feedbacks coming soon.
Matyas