Those aren't necessarily "mistakes" is what I'm saying about the mast height figures. Pre-war, the merchant marine of various nations had information on their own, and other nations ships, generally freely available from various sources. After the war started, the merchant marine of a given nation would think to themselves "how can I make it more difficult for a submarine to target my ships accurately?" So they would cut the height of the masts, or add more to them. Thinking further, if they would paint geometric shapes of various colors on the side of their ships, that would also "break the lines" of the ship as you were viewing it in the periscope at a distance, such that it might look much further away than it was, or much closer. Add a fake stack to alter the outline, or with a fake bow splash painted on, it would change the appearance of its speed. There were various "tricks" they used in attempts to make it to where the submarine skipper would miss a particular ship more often than not, if they weren't able to get in close and at a 90° track to their target, such that none of that matters. You just basically point and shoot then... but with "unreliable" targeting information, such as in the game's recognition manual, it is more like what a kaleun actually had to deal with... ??
By the same token, I also understand your desire for reliable information. It is a real bother to track a convoy for 12 hours or longer, waiting for dark, maybe rougher seas - some rain would be good, get your boat on a good intersect course, split through the escorts, only to be off several hundred yards on your track and the range is 1200 and not 900 meters, and then miss with three torpedoes behind, in spite of corrections... Perfect line-up and spread, other than the mast height was off by 6.5 meters, or whatever...
