Magnetic trackers risk claim refusal, UK drivers: install S5/S7

Fitter removing magnetic tracker from wheel arch

No, a magnetic DIY tracker is not insurance approved. Insurers expect a professionally fitted Thatcham S5 or S7 device with an installation certificate, not a magnet-fixed unit you attach yourself. Before buying anything, call your insurer and ask which S-category, S5 or S7, your policy requires.

TL;DR:

  • Magnetic or self-fit trackers are not recognized by insurers because they lack professional installation, tamper resistance, and concealment required for Thatcham certification.
  • Thatcham categories S5 and S7 require certified systems installed by accredited technicians, with S5 including automatic driver recognition for higher-value or targeted vehicles.
  • Confirm your insurer’s required category before purchasing, and always have a licensed professional install and provide a certificate to ensure coverage and validity.
  • Thatcham certification does not guarantee premium discounts, but a certified device is necessary for claims and compliance, with active monitoring subscriptions essential for functionality.
  • Installing a tracker without the correct category, proper certification, or professional fitting risks claim rejection, voiding coverage, and providing a false sense of security.
Thatcham Trackers
Choose the right approved tracker
Thatcham Trackers offers insurance approved S5 and S7 trackers for car and motorhome owners who need certified vehicle security.
Explore approved trackers

Table of Contents

Why magnetic or self-fit trackers fail insurance and Thatcham criteria

Thatcham certification requires tamper-resistant concealment and installation by an accredited engineer. A magnetic tracker sits on the outside of a vehicle or in a wheel arch, visible and removable in seconds. Security practitioners explain that magnetic or self-fit trackers cannot meet Thatcham requirements because professional installation and concealment form part of the certification itself, not an optional extra.

That matters at the point thieves matter most. Practitioners warn that magnetic or visible DIY units are easily found in a vehicle sweep, which defeats the tamper resistance insurers expect from a certified system. A device that can be pulled off in the car park offers none of the protection a policy is priced against.

The practical risks stack up:

  • A claim can be declined if the fitted device does not match the insurer’s required category.
  • Cover can be voided if the policy names Thatcham approval as a condition and the tracker fitted has none.
  • A magnetic tracker creates a false sense of security while offering no verified resistance to tampering.

Pro Tip: If a listing calls a magnetic tracker “insurance approved”, ask the seller for the Thatcham certificate number. If they cannot provide one, it is not certified.

Thatcham S7 and S5 explained: which category does your car need?

Thatcham S7

Thatcham Research operates two main categories for theft tracking: S7, defined as an Asset Location System, and S5, defined as a Vehicle Tracking System, each with its own technical performance and monitoring requirements.

An S7 tracker typically includes:

  • 24/7 connection to a monitored response centre.
  • GPS and GNSS location with a roaming SIM for coverage.
  • Battery backup in case the vehicle’s power is cut.
  • Tamper resistance built into the hardware and wiring.

An S5 tracker includes everything in S7, plus Automatic Driver Recognition. This means the system checks for a paired tag and raises an immediate alert if the vehicle moves without it present, which is why insurers tend to specify S5 for higher-value cars and models known to be targeted by relay attacks or key cloning.

Older policy documents sometimes reference “Cat 6” or “Cat 7” rather than S-categories. Cat 6 maps to S7 and Cat 7 maps to S5, so check the mapping carefully before ordering a device, since buying the wrong category will not satisfy the insurer’s actual condition.

How to buy and get a legitimately certified tracker fitted

Getting this right is mostly about sequence: confirm the requirement, buy the right device, then get it fitted properly.

  1. Confirm with your insurer which S-category, S5 or S7, your policy requires.
  2. Buy only from a supplier offering genuinely Thatcham-certified devices, such as the Thatcham S7 or Thatcham S5 ranges.
  3. Book installation with a Thatcham-accredited fitter, never a self-fit option for a certified category.
  4. Let the fitter conceal the unit, integrate the wiring, and test the system fully.
  5. Collect the installation certificate once fitting is complete.
  6. Activate the monitoring subscription and confirm the monitoring centre’s contact details.
  7. Send the certificate to your insurer if they request proof at renewal or claim stage.

Keep the certificate somewhere accessible, along with the subscription paperwork and the monitoring centre’s contact number. An insurer or loss adjuster can ask for this at any point during the policy term, not only when a claim is made.

Pro Tip: Photograph or scan your installation certificate the day you receive it. A digital copy is easier to produce quickly than a paper one left in the glovebox.

Insurance impact: do Thatcham-approved trackers lower premiums?

Thatcham certification is a testing benchmark, not an insurance product. Thatcham Research states plainly that certification does not automatically guarantee insurer recognition, so acceptance is something each insurer decides individually.

Confirming acceptance before you buy avoids paying for a device your insurer will not credit. Manufacturers often quote illustrative premium discount ranges, but insurer practice varies widely: some mandate a certified tracker as a condition of cover without promising any reduction at all, while others reward fitting with a lower premium.

It also helps to separate two things that get muddled in everyday conversation:

  • Theft tracking (S5 and S7) exists to locate and recover a stolen vehicle.
  • Telematics, or “black box” policies, monitor driving behaviour to help set premiums.

The ABI’s consumer guidance draws this distinction clearly and advises reading policy terms carefully, since the two product types serve different purposes and neither substitutes for the other.

Decision checklist: what to ask your insurer and fitter

Working through a short list before you commit to a device saves time and avoids buying the wrong thing twice.

Questions for your insurer:

  • Which S-category, S5 or S7, does the policy require?
  • Do you need the installation certificate submitted, or just kept on file?
  • Does fitting a certified tracker reduce the premium, or is it simply a condition of cover?
  • Are there vehicle-specific clauses, for example a named model prone to relay theft?

Questions for your fitter:

  • Can you show proof of Thatcham accreditation?
  • How will the unit be concealed and wired in?
  • Is the monitoring centre compliant with BS 8591?
  • If fitting S5, how does the driver recognition tag work day to day?

Pro Tip: Treat any claim of “Thatcham approval” on a magnetic or self-fit device as a red flag. If a seller cannot supply a certificate, walk away.

Once fitted, a certified tracker needs little attention, but a few habits keep it working and keep your cover intact.

  • Check the monitoring subscription stays active and renews on time.
  • Keep an eye on battery health and signal status if your system reports them.
  • Store the installation certificate somewhere you can find it quickly.
  • Ask your monitoring provider how long location logs are kept and whether they are shared with third parties.

On the legal side, fitting a tracker to your own vehicle is lawful in the UK. Fitting one to a vehicle you do not own, without the owner’s consent, is not, so lawful authority matters as much as the hardware itself.

Why Thatcham testing and proper installation matter

Thatcham Research runs the independent certification programme behind the S5 and S7 standards, setting the technical criteria that qualifying devices must meet. Professional installation and the resulting certificate are not paperwork on top of the standard, they are part of it, which is why insurers ask for that certificate at claim or renewal stage. Thatcham Trackers supplies S7, S5 and S5 Plus devices with accredited fitting, giving owners a route to the certificate their insurer will actually recognise.

A straight answer on magnetic trackers and insurance

Magnetic trackers get sold as a quick fix, but they solve a problem insurers do not recognise. The gap between “has a tracker” and “has a certified tracker” is exactly where claims get declined. Confirm the category with your insurer first, then fit the device properly.

— Thatcham Trackers

How Thatcham Trackers can help you get it right

Buying the correct device once, rather than twice, is the whole benefit here. Our Thatcham S7 suits most vehicles and covers the standard insurer requirement, while Thatcham S5 and Thatcham S5 Plus add Automatic Driver Recognition for high-value cars or models targeted by relay theft. For owners wanting extra protection against key cloning, the Casper Ghost-Like Immobiliser works alongside a tracker to stop the vehicle starting without an authorised tag.

Thatcham Trackers

  • Nationwide mobile installation carried out by accredited engineers.
  • Installation certificate issued on completion, ready for your insurer.
  • Monitoring subscription activated at the point of fitting.
  • Casper Pro option available for invisible, tag-based immobilisation.

Check the Thatcham Trackers collections and book a fitting that matches the category your insurer has confirmed.

Sources

FAQ

Which car trackers are insurance approved in the UK?

Insurers generally recognise trackers certified by Thatcham Research to either the S5 or S7 standard, fitted by an accredited engineer. A Thatcham S7 or Thatcham S5 device with an installation certificate is the recognised route, not a self-fit or magnetic unit.

Is there a Thatcham-approved tracker without a subscription?

Thatcham-certified S5 and S7 systems rely on an active connection to a 24/7 monitored centre, which requires an ongoing subscription to function as certified. There is no widely available Thatcham-approved device that operates without one.

Which trackers are Thatcham approved?

Thatcham approval applies to specific S5 and S7 rated products from certified manufacturers, such as the Thatcham S7, Thatcham S5 and Thatcham S5 Plus ranges. Each must be professionally installed and come with an installation certificate to satisfy insurer requirements.

Fitting a tracker to a vehicle you own is lawful in the UK. Fitting one to someone else’s vehicle without their consent is not, since lawful authority over the vehicle is required.