There's no historical answer because of numerous things in the code that can't be changed. For many TMO is very hard, but once you learn how it responds to it's AI, even it becomes easy. TMO was sort of a method to make it more realistic by making some things harder than they would be to makeup for the things you can't change that make the game unrealistically easy.
Basically the escorts always ping, even tho you can't hear it, it's just a matter if you fall within the cone of it's path it comes on as if it's always on, although angle, depth, weather, speed, etc., play some role. Just learn not to get in the path of the sonar cone.
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You see my dog don't like people laughing. He gets the crazy idea you're laughing at him. Now if you apologize like I know you're going to, I might convince him that you really didn't mean it.
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