You might want to search the WP discord server. There have been plenty rules of thumb postulated for that. But the problem is, different unit might have different source levels. So you might think X gain is Y far, but it could actually be further or closer. That's why I don't bother. It's also not that neccesary. Just point the bow at the sound and go full speed on the surface. They will appear soon enough out of the mist.
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