Stern tube shooting really helped me refine my tracking skills. It requires good course and timing to scoot across in front of a merchant. Too soon and he is too far away. Too late and you're wearing him as a new hat. It is very satisfying when I end up 600 yds away from him on a perfect 90 to his course.
Of course, I just restarted the war in an S-boat, so it doesn't matter any way.