The Falke works as an acoustic homing torpedo. You need to have a ship moving at a decent speed for it to lock on, and at a range beyond about 200-400m. At this range, it will turn towards whatever the loudest noise it hears is. Obviously, you want to go silent when you use this torpedo. Normally aiming in the general direction of your target works if it is going at the recommended speed of 10-20 knots. Not sure if it works with less, but that's what would work IRL.
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