By the way, this interface mod is the only one that always shows the TDC settings on the periscope screen, even when TDC autoupdate is turned ON. In ether words it's the first time that i see the dials moving when i move the periscope. This, coupled with my preety good understanding of the Fast 90 technique inspired me to a preety quick method of firing and interception. I've put it here, tell me what you think
http://www.subsim.com/radioroom/showthread.php?t=151431