This is probably one of the very best videos I've seen on how to use sonar only manual targeting...
After watching that video, you just might think it's just a bit too easy.
I have seen one other on passive sound readings only. And that is a bit tough because you have to triangulate range using bearings only. I don't have the link to it though. I don't recommend using passive only unless you are some type of super captain and just need a strong challenge.
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