Those messages are for immersion and don't include your boat even if you have the same number. (I once saw a message about a u-boat being sunk, and it was my number! Since I considered this was a coded message to me that my crew needed to be executed I went to work like a good little Nazi. Boy, did Doenitz let me have it when I got back to Lorient!)
The only thing you need to remember is to be more aggressive.
