We've been discussing the sensors and I just remembered a couple of incidents while I was out patolling and wondering that the Japanese DDs could possibly detect me.
I was in in a total monsoon, raining so hard you can't possibly see anything. I pick up a task force heading northeast toward Tokyo Bay. I turned to a intercept course and noticed two of the blips on radar had peeled off and were heading straight for me. I crashed dive and headed towards the rest of the task force. I still haven't figured how those two DDs knew where to find me other than they were physic and saw me coming.
