BBW I guess it makes sense though, it's usually the spot occupied by a warship of some sort, that or it's smack bang in the middle,
could you drop a hint as to why those evil passenger/cargos are so hard to sink?
I've also noted that convoys haven't got neutrals mixed in anymore, which is great, since a friend of mine who started stock SH3 at 100% realism got his first big score blasting a passenger liner out of a convoy at 5000 meters at night, only to have it turn out to be a neutral, which caused him to give up the whole thing in frustration