I just started to play manual targeting. I found it almost impossibile to recognise ships at night because I just couldn't see any thing.
Last night, my hydrophone picked up a cargo ship which was about 3 km away, I knew the bearing but I just couldn't spot it with my periscope because it was just simply too dark.
I was so frustrated not able to attack at night, so I increased the brightness of my screen and that enabled me to spot it and use the recognition manual. Was that kind of cheating? How difficult to see ships within 3 km at night under good weather in real world?