Most fruitful enemy ports?

[winters]

I have the IUB mod installed and i also use SH3 Commander and before i start searching every port i wanted to ask what players experience have been in finding enemy ports with decent ships docked.

I checked up near Scapa Flow but all i found was a bunch of destroyers, nothing to rave about. I do have the list that tells you when and where capital ships are docked but i was more interested in finding harbors where convoys are preparing to leave.

Thanks for the help