Not only that, but you could put the data into the Vorhaltrechner yourself by either hitting F6 and entering it there, or if you really want that double juiced-in U-boat flavor, click on the weapons officer and enter it yourself on the Vht.
Oh, and get yourself a Kriegsmarine whiz-wheel. Here's the thread where you can get the files to make one:
http://www.subsim.com/radioroom/showthread.php?t=114351