Your location can be calculated even from a normal voice message. An OSINT researcher has shown a way to determine the location of a recording by the sound of aircraft flying. The system analyzes changes in the engine noise and compares the data with the flight history, making it possible to determine where the person was. There is already a tool for this called Dopplergist on GitHub. However, the method does not always work - you need the aircraft's audible sound, time recording and flight data.