[Corsair]

I don't waste too much time either if they are too far away when I get the info, due to possible changes in speed/direction. Except when it is obvious where they are going (like Gibraltar straight, North or South entry of the Irish sea, etc...) I then usually head for the bottleneck.
Sometimes you're just lucky, yesterday I found one in hard weather (15m/s winds and light fog) by a routine hydrophone check that had crossed my route unseen. One hour later I had 2 large tankers down...