Hi Spraki,
1) no hydrophones on freighters, some have search lights
2) at the beginning of war, freighters were not armed. Do not remember the starting year for them to be armed though
3) silent running is necessary only within a close radius of escorts.
By night, escort can’t see you even surfaced if not too close. You can run decks awash too, to avoid detection also. Escort can’t hear you when you are behind them ( they hear their own prop)
Best is to anticipate the convoy path, and wait all stopped submerged…if possible 90 degrés from the path.
4) don’T leave your periscope too long out the water!
5) surface attack with escorts is suicide
6) you can manually choose the torpedo type for refitting imho
Cheers
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