Well, you just can't fire and forget (unless the target is righ on top of you).
You must manouver the torpedo to the target, and that is why you must track it continuosly through TMA and sonar. So that you know when the target releases countermeasures, when it evades doing a 180 or changing course, etc...
Ps: you're also firing from very very far, so TMA and Sonar tracking of the target is even more important.
At 30000 yards = 15 nm a 55 knots torpedo needs at least 15 minutes to arrive on target, and that is if the target is not evading etc...
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