Immigration and Customs Enforcement (ICE), the FBI, and a handful of other federal agencies have also purchased location data from brokers in recent years, but the internal document from the Department of Homeland Security obtained by 404 Media confirms that CBP has sourced its location tracking in part from real-time bidding (RTB), which is behind every online ad you are served.
In the meantime, both ad tech companies and advertisers receive all of your data, and organizations that purchase this data can connect movements to specific devices, facilitating surveillance over a period of time.
How to protect your location data against tracking
All of this means that you can (and should) take a few steps to minimize how your location is tracked and shared.
Security & privacy > Privacy controls > Ads and tap Delete advertising ID.
Privacy & Security > Tracking and toggle off Allow Apps to Request to Track. Then, go to Settings > Privacy & Security > Apple Advertising and disable Personalized Ads to eliminate internal tracking for Apple's native services.
Audit which apps have access to location services
On iOS, this is under Settings > Privacy & Security > Location Services, where you can select permissions and toggle off Precise Location for individual apps. On Android, go to Settings > Privacy & Security > Privacy Controls > Permission Manager.
Use airplane mode to stop real-time tracking
Airplane mode is a one-touch way to limit tracking—useful if you are headed to a protest or other sensitive location. Your device can still store and transmit this data later, but EFF notes that most apps aren't that likely to do so.
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