T 5.159 Creation of movement profiles using Bluetooth
If the Bluetooth interface of devices is turned on, the position of these devices may be located. For this purpose, several Bluetooth receivers are required, ideally with enhanced reception using additional antennas or amplifiers. In laboratory environments, Bluetooth devices could be located over distances of up to 2 kilometres. Depending on the attackers' equipment, it is irrelevant whether the Bluetooth device was set to visible or invisible.
Using this method, it is basically possible to create a movement profile of a person by recording the positions of the Bluetooth device over an extended period of time as the Bluetooth device ID is always assigned to one device and can therefore usually be attributed to one person.