Measuring position in a room with mics synced with GPS modules in the corners, with 1 or 2 on the floor

Other Hardware Sensors
4

thanks for the insight. I might try "Acoustic location". I did some math and I think I'm wrong. sound is 1100 feet/second or 335280 mm/second so If I want 1mm accuracy I would only need a clock to run at 335280Hz or 335.28KHz?