The knob has only two positions, up and down. Clicking on the upper part turns it up, and this is the position in which you want it to be. During the hydrophone check, completely stop your engines!
I'm not sure, but I think that your engine noise doesn't bother the sonar man, as it seems that he can detect a contact regardless of your speed. Does anyone has any info on this? :hmm:
Be noted that the volume knob returns to its "down" position each time you reload the game, so you have to turn it up again.
Hope this helps.
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