Who plants GPS trackers and why
GPS trackers are placed on vehicles by competitors conducting corporate intelligence operations; by estranged partners or family members in contentious personal situations; by organised criminal groups monitoring high-value targets; and, occasionally, by state or state-affiliated actors targeting executives, journalists, or activists. The common element is that the target rarely knows the device is there until it is specifically looked for.
The placement opportunity is brief — a tracker can be attached to an undercarriage magnetic mount in under 30 seconds in a car park or at a traffic stop. Purpose-built tracking devices have batteries lasting weeks to months and can be purchased for under €100 online. The gap between the low cost of placement and the high value of the intelligence gathered makes vehicle tracking a common tool across threat actor categories.
Why consumer RF scanners miss most modern trackers
Consumer-grade RF detectors sold as 'GPS detector' or 'bug detector' devices operate on a simple principle: they look for active RF transmissions in the frequencies where consumer GPS trackers are known to transmit. Modern professional-grade trackers defeat this approach in three ways: they can operate in store-and-forward mode, storing location data locally and transmitting in brief bursts at irregular intervals; they can be placed in a sleep state activated by motion, meaning the vehicle must be moving for the transmission to occur; and some use encrypted satellite communication on frequencies outside the range of consumer detectors.
NLJD (non-linear junction detection) addresses the gap by detecting the electronic signature of semiconductor components regardless of whether the device is transmitting. It can identify a hidden tracker whether it is sleeping, in store mode, or on a frequency outside the RF scanner's range. For a complete vehicle inspection, physical search and NLJD are both required.
The vehicle inspection process
A professional GPS tracker sweep begins with a visual and physical inspection of the most common placement locations: the undercarriage and chassis rails, wheel arches (front and rear), front and rear bumpers, under the bonnet near the battery and engine bay, the interior OBD-II port, seat rails, and boot space. Magnetically mounted devices are the easiest to place and the easiest to find during physical inspection. Hardwired devices require checking the vehicle's electrical system for unauthorised taps.
The NLJD sweep follows the physical inspection, scanning cavities, panels, and structural areas where physical access is limited. The RF sweep runs concurrently, looking for active transmissions. The full inspection covers the exterior undercarriage, wheel arches and bumpers, bonnet, passenger compartment (including all panels and storage areas), and boot. The vehicle should be clean and free of non-standard modifications before the sweep to reduce false positive signals.
What to do if a tracker is found
If a GPS tracker is found, the most important immediate decision is whether to remove it or leave it in place. Removing it immediately alerts the party monitoring it that the device has been discovered. Leaving it in place — potentially with a countermeasure — can allow collection of intelligence on who is monitoring the vehicle and for how long.
In most civilian cases, the correct decision is to document the device with photographs and then involve law enforcement before removal, as an unauthorised tracking device constitutes criminal trespass and in many EU jurisdictions a data protection offence. Mission Support's TSCM team can advise on the appropriate response, including whether to involve police, legal counsel, or a counter-intelligence assessment.
Frequently asked
Can I check my own car for a GPS tracker?
You can perform a basic physical check of easily accessible areas — undercarriage, wheel arches, bumper edges. However, without NLJD equipment you cannot detect sleeping or store-and-forward devices in cavities, panels, or areas requiring disassembly. A professional inspection covers the full vehicle and uses equipment that consumer tools cannot replicate.
Is it illegal to place a GPS tracker on someone else's car?
Yes. In the Netherlands, placing a tracking device on a vehicle without the owner's consent constitutes criminal trespass and, under GDPR, an unlawful processing of personal data (location data is personal data). In practice most cases involve a domestic or civil dispute, but the legal exposure applies regardless of motive.
How much does a professional vehicle GPS sweep cost?
A professional vehicle inspection for GPS trackers and technical surveillance devices is priced by vehicle type and inspection scope. Contact Mission Support for a specific quote; the inspection typically takes 60–90 minutes at a secure inspection facility.