A good way to avoid shooting yourself is to try to bound what depths the enemy is at. If it's a submarine you can usually figure out if he's above layer or below layer, and then set a floor or ceiling so that you can get on the opposite side of it while the torpedo is running out. If you do this sort of maneuver, be sure to have another shot ready to quickly follow up with set assuming that the submarine will switch sides of the sonic layer. That way if he manages to sneak across the sonic layer to evade the first shot you can keep him on the defense.
In the case of targeting surface ships it's even easier, just set the floor to your periscope or snorkel depth. That will keep you safe from yourself.
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