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Millions in security were not enough: a war frigate from the Netherlands was tracked for hours with a simple Bluetooth device sent by military mail.

Written by Noel Budeguer
Published on 22/04/2026 at 12:13
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A military vessel surrounded by sensors, protocols, and heavy defense was exposed by a domestic object costing a few euros that entered through military mail and revealed a simple breach with strategic effect

Protecting a warship is expensive and involves a heavy network of surveillance, protocols, and control. Still, a frigate from the Royal Netherlands Navy had its route tracked in real-time with a low-cost Bluetooth tracker sent by military mail.

The case involves the Evertsen, a vessel integrated into the group of the French aircraft carrier Charles de Gaulle. The episode exposed a simple yet delicate flaw at a time when the frigate was engaged in a sensitive mission in the Mediterranean.

A frigate protected by millions

The vessel was part of a significant military operation and helped protect the aircraft carrier against aerial threats and missile attacks. In this scenario, the ship’s location becomes strategic data.

The problem gained weight because the exposure did not come from a sophisticated attack. The tracking occurred with a common, cheap, and discreet object capable of crossing a military logistical channel without drawing attention.

The Dutch frigate Zr.Ms. Evertsen sails integrated into the combat group of the aircraft carrier Charles de Gaulle during a mission in the Mediterranean.

The entry happened through a postcard

The device was placed inside a postcard sent by the military postal service. The movement did not depend on a digital invasion or a complex operation.

The flaw appeared at a basic point in the routine. Packages underwent X-ray inspection, but envelopes did not receive the same control, which allowed the tracker to continue its journey to the vessel.

Route passed through the Netherlands, Eindhoven, and Crete

After entering the postal flow, the tracker ceased to be just a test and became real tracking. The identified route passed through Den Helder, the airport of Eindhoven, and reached the port of Heraklion in Crete.

According to Omroep Gelderland, a regional news channel from the Netherlands, the trail was also confirmed by camera footage at the port, with the Evertsen docked at the quay. From there, monitoring advanced to the sea.

Signal followed at sea for 24 hours

On March 27, the frigate left the port and continued to emit its position for about 24 hours. First, it circled the coast of Crete. Then, it advanced eastward.

The signal only disappeared near Cyprus. This detail heightened the seriousness of the episode, as it showed that tracking continued even with the ship already integrated into operational movement at sea.

Ministry changed rules after the case

A low-cost Bluetooth tracker hidden in a military mail envelope illustrates the vulnerability that allowed the Dutch frigate Evertsen to be followed for hours during a naval mission.

After the episode was disclosed, the Ministry of Defense of the Netherlands announced changes to military mail guidelines. Among them, sending greeting cards with batteries to the Evertsen was prohibited.

The department also stated that the tracker was located during the screening of mail on board, when the frigate had already left the port. Nevertheless, it acknowledged that the ship could be tracked at sea, although without operational risk, according to the official assessment.

Simple failure exposed a sensitive point

The episode shows that a mission surrounded by technology, weaponry, and protection can still be affected by a small, everyday breach. An advanced system was not needed to open this tracking window.

When a low-cost household item can track an active military vessel, the alert goes beyond the isolated case. The failure pressures protocols, exposes basic vulnerabilities, and changes the strategic reading.

With information from Xataka

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Noel Budeguer

Sou jornalista argentino baseado no Rio de Janeiro, com foco em energia e geopolítica, além de tecnologia e assuntos militares. Produzo análises e reportagens com linguagem acessível, dados, contexto e visão estratégica sobre os movimentos que impactam o Brasil e o mundo. 📩 Contato: noelbudeguer@gmail.com

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