Well, I quickly did to tests of your file, Jungman. Sadly, I think they are still attracted to the snorkel like a dog to a bone. The first test was done with a wind speed of 8m/s, partial clouds, no precip, light fog. The second test was pretty much the same except for 13m/s winds. I can to periscope depth and not more than an hour later (game time) two Sunderlands showed up. In the second test it was a couple hours longer before they showed. Each time they caused heavy damage, with the second being a death blow.
