Uber Gruber is right, the most reliable way to plot a target's position whithout auto map updates is through the watch officer... Even then you'll get errors up to +/-49.5 meters (since he only uses multiples of a 100 to call of ranges)
I rarely use the stadimiter if at all this days, since I've found that it only works well when your extremely close to the target (less that a 1000 meters)... but by then I allready have all the info I need on the cotact's track so why bother?
The stadimeter method is so horrible that even with practice you can easily get it wrong by a kilometer or more if you are, lets say, 6 kilometers away from the target... at those distances you can surface without fear of being detected (at least early in the war) and ask the watch officer for range info instead.
Again, to learn more just follow the links to Wazoo's material and to the Wiki manual. Another good source of info is the Avon Lady's FAQ, but I don't recall right now if it touches this subject.
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