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  "path": "/blog/archives/2026/04/hiding-bluetooth-trackers-in-mail.html",
  "publishedAt": "2026-04-24T11:01:03.000Z",
  "site": "https://www.schneier.com",
  "tags": [
    "Uncategorized",
    "Bluetooth",
    "tracking",
    "track"
  ],
  "textContent": "It was used to track a Dutch naval ship:\n\n> Dutch journalist Just Vervaart, working for regional media network Omroep Gelderland, followed the directions posted on the Dutch government website and mailed a postcard with a hidden tracker inside. Because of this, they were able to track the ship for about a day, watching it sail from Heraklion, Crete, before it turned towards Cyprus. While it only showed the location of that one vessel, knowing that it was part of a carrier strike group sailing in the Mediterranean could potentially put the entire fleet at risk...",
  "title": "Hiding Bluetooth Trackers in Mail"
}