Welcome,
and other than in game pull up map you really shouldn't need any other help for finding convoys.Just patrol those sectors lanes and read what periods of war they were active.
Note that some( many) of convoys are traveling outside those lines , so thats not to accurate. Last 2 large convoys i encountered were far away from convoy lanes.
I have no problems runing into them, and i am no expert by any means and purposes. Usually i run into 2-3 convoys per patrol, more then i have torpedos for it.
Plus i always avoid choke points , which could be death traps later in the war.
Good hunting
