Firing a torpedo involves three or more factors while attempting to maintain stealth.
The directions and speed of the ships, the current, and possibly terrain, means that shooting a torpedo is a tricky bit of math especially when the other ships position speed and such may not be known perfectly.
On top of that, while torpedoes CAN use sonar, the later it goes into active hunting mode the better chance to hit the target so the goal is a shot with a course that maximizes the chance of putting the fish in striking range and minimizing the chance to the enemy escaping it.
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