Well Patrol 8 went well, only one small convoy and I was driven off before I could get a shot off... must be more carefull!
Lots of singles though.
One thing that Ive noticed, sunk ships are giving me sonar readings. I get the green light whenever I sweep across a sunken ship? Gets a little annoying when you've sunk a bunch, whats with that?
Patrol 9 has me going into the northen sea of Japan, with a warning about mines...