Sonar mounted to the periscope?

[gonzosts]

I understand how sonar works. What I meant was that if you are at PD and doing a 360 degree scan, the noise you here as you move the scope around shouldn't change. I could tell there was a destroyer at about 270 degrees even before the scope was out of the water by just listening to the background sound in the game as i spun the scope.

I think it is a bug in the game.