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Tonnage Bar Fix Here > Tutorial Post #188 Not Needed If Using TWOS & sobers Latest Mods List 
Post #24 Shaefer’s Season 2 Let's Play Silent Hunter 5 YouTube Videos 
Troop transports, AMC's 17,000 tons (Rawalpindi) amongst others come and go out of Loch Ewe.
Patrolling an area above from the DD's should bring some results.
If you take a ruler from the middle of the Loch Ewe entrance and angle it to the left so it is close to the headland at the top , something like 11 o'clock this is a well used course.
If you position yourself in the middle of the ruler line and use the hydrophone you should be able to pick up anything in the area.
Alternatively record all of your tonnage to date from the Captain's Log and use my tutorial post #188.
Peter