I will be a little vague to make sure I don't get too close to the line, but in general each platform has different NB to BB detection characteristics are different for types of contacts. Some specific tonals carry much better as well although they often don't get you much ID wise.
The rules change a good bit in different enviroments. When you are focusing on a specific target a good sonar team will know what tonals they will pick up in what order. They will also have some idea at what point they might gain BB contact.
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