While in port between missions there is a screen where you can open the box with your medals, and also open the log book with your patrol history (including ships sunk and tonnages) - there is also something on that page to click to display a list of the top U-boat aces names and tonnages, and that also shows your tonnage total so you can compare yourself to the top 10 or so real kaleuns as of that point in the war.
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