Well seeing as the sonar is passive I dont think thats what is giving you away.
More likely your tactics.
The best way to attack a convoy is to lay in wait rigged for silent running with the periscope down, not trying to 'sneak up' on them. The highest speed you should need would be in the order of 3 knots.
Even then sometimes the escorts are going to pick you up anyways as they have the luxury of being able to bang away with their active sonar.
Oh and welcom to the forums !
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