A Dutch broadcaster demonstrated an operational security failure by tracking the air-defense frigate HNLMS Evertsen after hiding a low-cost Bluetooth tracker inside a postcard mailed to the ship. Using publicly available Dutch Ministry of Defence mailing instructions for deployed personnel, the journalists sent the device to the vessel, where it reportedly remained active for about 24 hours and revealed movement from Heraklion, Crete, toward Cyprus.
Dutch defence officials said the tracker was discovered during mail sorting and disabled, but the incident exposed weaknesses in mail-screening procedures and the risks posed by consumer tracking technology combined with routine administrative information. The Ministry of Defence said it is changing its mail policies, including banning greeting cards containing batteries and reviewing broader guidance for mail sent to deployed forces; the frigate was reportedly operating on a mission to protect the French aircraft carrier Charles de Gaulle.

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In response to the tracking incident, the Dutch Ministry of Defence said it changed or began reviewing its mail policies. Measures included banning greeting cards containing batteries and reassessing broader mail guidance for deployed personnel.
Dutch defence officials said the hidden tracker was discovered by the crew during mail sorting and then disabled. The discovery ended the live location exposure but highlighted weaknesses in screening mailed items sent to deployed forces.
After reaching the ship, the Bluetooth tracker reportedly remained active for roughly 24 hours, allowing the journalists to follow HNLMS Evertsen's movement from Heraklion, Crete, toward Cyprus. The incident demonstrated that a consumer tracking device could reveal operational movements of a naval vessel.
Dutch broadcaster Omroep Gelderland used publicly available Dutch Ministry of Defence mailing instructions to send a Bluetooth tracker hidden inside a postcard to the deployed frigate HNLMS Evertsen. The tracker was intended to test whether the ship's location could be exposed through ordinary mail.
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