They tended to listen in passive mode (not that the sets were that reliable early on) and go active intermittently.
However, the second they suspect a U-boat was around they would go active.
Check the game out carefully and you will often see one go active whilst another listens intently close by.
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Wise men speak because they have something to say; Fools because they have to say something.
Oh my God, not again!!
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