Also keep in mind that profile-to-target plays a role as well. Coming at them dead on (So that they would interpret YOUR AoB as 0) gives them much less to work with than if you were strafing across them and they had a full lengthwise view of your sub. This plays an equal role both in visual identification and sonar detection, as I understand it. More surface area means there's both more to be seen and more that sound waves can be bounced off of.
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