Able72
The Zielkurswinkel finder is your AOB tool. That is the one that was installed in the real VII as well. And as shown it was mounted on the attack periscope around one of the eye pieces.
http://www.uboatnet.de/Technik/Angriffsehrohr.htm
http://www.sukhoi.ru/forum/attachmen...2&d=1255798351
And as the later PDF allso describes. The bearing indicator on the top of the scope WAS visual through the eyepiece of some of the periscope models. So IMO we should keep that.