Well... here's from Peter Rodschou's career:
1st patrol --------------------------------------------
1. august, 1941, departing La Rochelle
8. CG85 - small freighter
9. CG86 - large cargo
10. CG86 - passenger/cargo
13. CG85 - passenger/cargo
14. CG81 - small merchant
16. resupply at Thalia
22. august, 1941, departing Thalia
22. CG94 - large cargo (two!)
26. CG79 - one medium and one large cargo
27. resupply at Thalia
16. september, 1941, departing Thalia
16. CG86 - tramp steamer and one large cargo
17. CG82 - small merchant
22. BE71 - small merchant
24. BE63 - passenger/cargo
BF41 - small freighter
28. september, 1941, docking at new base, Brest
2nd patrol --------------------------------------------
13. november, 1941, departing Brest
15. BF19 (convoy) - large merchant
BF15 - large merchant, liberty cargo and one passenger/cargo
16. BE36 - small merchant
23. BE64 - large merchant
24. BE66 - liberty cargo
26. november, back at Brest
3rd patrol --------------------------------------------
6. februar 1942, departing Brest after major (needed) overhaul
6. BF52 - british S-class submarine (8 hours after leaving port....)
11. CG84 - small merchant
26. DT33 (convoy) - modern medium tanker, large cargo, whale factory
28. februar, docking at Corrientes for resupply
5. marts, departing Corrientes
10. CE69 - modern medium tanker and small merchant
20. BE38 - (convoy) large merchant (2), large cargo (2), liberty cargo
21. BE17 - medium tanker
23. marts, 1942, docking at Brest
4th patrol --------------------------------------------
20. may, 1942, departing Brest
23. BE63 - small freighter and passenger/cargo
24. BE14 - large merchant
BE39 (convoy) - large cargo, medium cargo, (2), heavy transport, large merchant
28. AL55 - large cargo
6. june, 1942, resupply at U-463, which just arrived in BD35.
9. june, leaving U-463 after being held up by foul weather.
11. june arrived at patrol grid and that's where I'm right now.
Convoys are picked up by radiocontact.
Lone ships by sonar, we
do spend a lot of time submerged.
Good hunting!
rod.