Then I'll guess its not a smart way to follow him like that.
Use hydrophone instead.
its a lot safer.
-edit- like the guy said above. and also I want to add. when youre becoming close to an Convoy or warship like 4000 meters...go on Silent Rig.
my way of going for an Convoy when I have an Contact report
-Calculate Speed/Distance and go for intercept course
-head for the expected location
-Sound contact made. I Lay my trap
-Visual contact I Mostly count the amount of Escort Destroyers and their location .
-Choose the biggest boat (I,m not going to shoot a small merchant...I need some really good tonnage or else getting my ass DC's isnt worth it.)
-entering the 4000 Zone = Running on silent rig lowering my periscope...and sometimes I higher to see how far I am.
-entering the 1000 meter Zone = Turn speed down to 1 knot. Prepare Torpedos
-My target 800 meters away = setting TDC right so they my fish will penetrate the Engine compartment.
-Fire!
-I'll stay on PD for a while and prepare my 3th fish for launch.
-Ship struggling? 3th torpedo underway!
-Dive to 120 meters and later on I repeat my steps from Targeting - Prepare - Shoot - Dive. untill i,m forced to move myself away (Air - Battery) or when i,m outta fish