I found that the best place to intercept task forces is in the straight that leads up from the Java Sea to the celebes sea. Ain't no where for them to run. :P Once I got the location of the TF and its heading, I sat in its general path at periscope depth with engines off and just waited....what a beautiful sight to see about 4 BBs, seaplane tenders, etc sailing past...the only issue was that I didn't have enough torps.