"In its current iteration, a Gimbal beacon requires a third-party app to trigger advertisements, and requires those apps to receive 'opt-in' permission from users in order to collect data and send notifications. (Users, of course, also need to have Bluetooth enabled.) ... Gimbal-powered apps may collect your current location, the time of day you passed the beacon, and details about your device."
If the beacons are doing anything more, it is not reported in this article.
If you turn on wifi tether mode, you are broadcasting your unique Mac address. Not sure if you have just BT headset running, can they sniff an unique address from the air way.
"In its current iteration, a Gimbal beacon requires a third-party app to trigger advertisements, and requires those apps to receive 'opt-in' permission from users in order to collect data and send notifications. (Users, of course, also need to have Bluetooth enabled.) ... Gimbal-powered apps may collect your current location, the time of day you passed the beacon, and details about your device."
If the beacons are doing anything more, it is not reported in this article.