[Onkel Neal]

Select Quick Encounter, you will start the game with the convoy generally behind you and moving in your direction within visual range.

or,

With Quick Encounter not checked, with Clear weather selected:
start the mission, dive to 20m, go All Stop, listen for the convoy with the hydrophones. When you get a relative bearing, set course to intercept. Then surface, select Diesel engines and order Full Speed. Man the lookouts, you usually will see the enemy before they can see you.

If you select a mission with Fog conditions, all bets are off, you will need to be ready to dive as soon as a visual contact is made. Fog is the great equalizer, it's almost like playing a maze game.

Friend me and if you see me online, I will assist.