Early war hunting

[Rg370]

Hi all, i am interested where kaleuns are patroling in early war (before moving to french coast).
Do you sail along the east Britain coast, or go around Scottland to find convoys?
I have done a few patrols, and all ships i've sunk were some small ships(tugboat,
small merchant, small this, small that).
Where are the big ones? It is so frustrating to see that after carefull,calculated interception all i get is some friggin tugboat.

If this continues i am going to become a tugboat tonnagee king