Shots fired: ShotSpotter gunfire detection system provides
https://www.police1.com/police-products/police-technology/articles/shots-fired-shotspotter-gunfire-detection-system-provides-leg-up-on-911-OEDM4VOPJBgrj5AO/
WebSep 25, 2007 · Once a shot is fired, the sound waves travel from the weapon to the three nearest sensors. The system uses "acoustic triangulation" — deduction based on the speed of sound — in conjunction with GPS to locate the shot, and the sensors then record and relay the information to the dispatch center.
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