Radar-based counter-battery fire already exists and would be far more accurate, as radar tends to propagate more predictably (and faster) than sound. Though ye

Radar-based counter-battery fire already exists and would be far more accurate, as radar tends to propagate more predictably (and faster) than sound. Though yes, that's an option, it's called artillery sound ranging: <https://en.wikipedia.org/wiki/Artillery_sound_ranging https://en.wikipedia.org/wiki/Artillery_sound_ranging> A subset of acoustic location: <https://en.wikipedia.org/wiki/Acoustic_location https://en.wikipedia.org/wiki/Acoustic_location> Audio-based range-finders were used extensively in WWII: <https://yewtu.be/watch?v=04F5osXK4vw https://yewtu.be/watch?v=04F5osXK4vw> (Tom Scott: "Testing the sound mirrors that protected Britain") Also: <https://www.gettyimages.com/detail/news-photo/german-world-war-ii-aircraft-sound-detector-or-acoustic-news-photo/526929302 https://www.gettyimages.com/detail/news-photo/german-world-w...> Optical rangefinders were also used: <https://www.navalgazing.net/Rangefinding https://www.navalgazing.net/Rangefinding> (I've tried but failed to find large audio/sound based naval rangefinders, which essentially consisted of gigantic ear trumpets, roughly the size of a human. Used in WWII by both US and Japanese navies as I recall.)