Interesting, the only contacts I had to deal with where two Elco torpedo boats heading in the direction of the merchant I had sunk South of Ireland, I saw them and dived before they realized I was there. I also sank a small Trawler with my deck gun in the middle of the Irish sea and still didn't have any hostiles.
I actually didn't have any radio qualifications.
Just gave 3 out via SH3Commander. I would of had atleast 20,000 tons(including the 9,982 from earlier) under my belt if it hadn't been for the sonarman.