Sitting here thinking on this...
Yes, skippers in the sub fleet, regardless of which side they were on, had recog manuals.
Which they could draw on for a pretty good read on what ship they were seeing.. that much, is agreed on.
How hard would it be to include ships, that can be ID'ed as what ship they are, within reason... but.. have varying in nature as to what their draft is, compared to what the gross unloaded tonnage would be.. simulating the different factors, such as fuel status, cargo they have on board, at any given time frame.. how many hot bodies they had on board at the time... things of that nature...
Would think if that can be done, it would increase the difficulty factor of knowing just what depth to put a torp for an under the keel mag det shot...
To simulate that unknown factor... just a thought. If it can be done, that is...
M. M.