Just conducted my first manual attack without use of the periscope, sonar or external view, scored two out of two hits! Turned out to be a portuguese medium cargo...
She went to the bottom to. If anyones interested in how to do this, let me know and I'll try and explain breifly. Very useful when stormy seas are exposing your sub or preventing you from accumalting target data through the scope.
...and extremely satisfying!!
