Das Boot is a good film based on a good book, but there are still some obvious shortcomings when it comes to reflecting reality accurately. German periscopes had split prism stadimeters in many models, others (mainly the observation periscopes) didn't. But even so, once you have the hang of it it isn't that difficult to get range to target -not completely accurate, but at least accurate enough for our purposes-. The problem is that convincing people who are still not veteran with this game that practice will make masters out of them, is very difficult
. But trust me, if you understand the mechanics of how it worked in real life, and practice a LOT, somewhen it all will suddenly fall in place.
