Pretty much the same since approaching convoys is very hard , on the surface they will detect you with radar and submerged you have to be really silent ( 2 kts or so ) - at this speed you may only reach a good position if their course is favorable, otherwise they are gone. I usually go for 6-7 km shots , this way you have a chance to slip away undetected after the torpedoes explode , getting closer is pretty dangerous .
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