Heffalump: good advice. I started a VIIC with a snorkel, and found it much easier to manage. That doesn't help U-195 (IXD2) who is now rusty and full of salt, and who never had that luxury.
About your convoy attack method: do you feel that FaT's are the best weapon? I feel like it's kind of a random attack - you don't know who you're gonna hit, and hence can't appropriately choose depth for keel shots. Do you score many kills (or just disables) with FaTs after they start the latter pattern?
KB
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