Thanks Armistead. I was hoping you'd chime in

. I would totally use radar if I had it. As a long time SH4 player and loyal fan of that game, I almost feel guilty saying it but I've been playing SH5 a lot lately.

Hence...no radar...hence my question about trying to nail down a decent solution/course on a large convoy using hydrophone only.
Maybe the answer is to shadow it until weather improves.
On a separate note, SH5 really has improved greatly. There are 2 or 3 "must have mods" that have fixed almost all issues with the game. Those who feel like getting back into a Uboat really should try it.
Thanks for your reply.