[Wigabee]

Okay guys! Thanks for the replies. I have gathered enough information from the posts that now I just have to practice it. As usual, I have come up with a second question and it goes as follows. How did real u-boat captains gather their information on a merchant ship or convoy? How did they find the target's speed, range, aob, and course? Whenever I gather information it seems like I'm cheating so I would just like to know how those four pieces of information were really found, not just by the guess of an experienced eye. Thanks again, you were all a big help!