Yep, like Steve wrote, there is no need for the exact course at the beginning of the approach, nor there is need for the exact parallel course. So I use to take an optimal approach course = target's bearing about 80 degrees left / right. I would say, more often than in 9 cases out of 10 you get yourself in a good position - even when the target is fast one. That's one good reason to use OAC actually: If the target is very fast, like for example task forcec usually are, you'll get yourself at least into the torpedorange. If you would try to parallel course technic in approach when you are dealing with task force, well... you know what happens: Not a single possibility for launching the eels.
Personally I use parallel course only for shadowing, or for the angled shots in the case I'm attacking on convoy on the surface.
-RC-
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