I'll introduce the technology underlying bluetooth trackers from Apple and Google, and will describe and show what can actually be seen on the air (using a hackrf/rad1o for example). This is part demonstration of what is possible right now, part explanation of the underlying principles, and part invitation to would-be hackers to make creative use of this technology. Apple's "Find My" network has been online for more than 5 years. Google has launched its own variant "Find My Device" this year. The Apple protocol has been previously reverse-engineered, while Google's specs are publicly available. Both take part in Detecting Unwanted Location Trackers (DULT), an IETF draft. Underlying this is standard Bluetooth Low Energy (BLE) which can be analyzed, and toyed with, with all the standard BLE research tools. I'll show how to sniff and interact with these trackers using tools that many hackers might already have available. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2024/hub/event/find-my-101/