US Patent 10969499 Luggage tracking system

A device, system, and method for tracking luggage in which the transmission of wireless signals by the device is turned off and on in response to sensor data, including the detection by a barometer of a decrease in atmospheric pressure of at least 13.8 kPa; lack of reception by a GPS receiver of a GPS signal and detection by an accelerometer and magnetometer of low frequency, low amplitude vibrations; and/or reception by a Bluetooth module of GPS coordinates transmitted by another luggage tracking device.