If you are researching vehicle security, you have probably searched for a "ghost tracker" — a term that confuses two very different systems. The Autowatch Ghost II is an immobiliser. The Thatcham S5 is a tracker. One stops your car being driven. The other finds it after a theft. This guide explains the difference and why the best protection uses both.
PIN-protected engine start. Silent and invisible to thieves.
24/7 control centre monitoring with automatic theft alerts.
Insurers increasingly require both immobiliser and tracker.
Essential for premium and keyless-entry vehicles.
Vehicle security falls into two categories: theft prevention and theft recovery. Understanding which system does which is the first step to choosing the right protection.
Ghost II Immobiliser (Prevention) — The Ghost is installed deep inside your vehicle's electronics. When you get in, you enter a secret PIN sequence using buttons already on your dashboard or steering wheel. Without that PIN, the engine will not start — even if a thief has your key, a cloned signal or a relay device. There is nothing to cut, nothing to find and nothing to bypass quickly. It is completely silent and invisible.
Thatcham S5 Tracker (Recovery) — The S5 tracker does not stop the car starting. Instead, it hides a GPS and GSM unit somewhere in the vehicle. If the car moves without the driver ID tag present, a 24/7 control centre is alerted automatically. They call you to confirm the theft, then liaise directly with police to coordinate recovery. The S5 is about finding your car fast — usually before it is stripped or shipped abroad.
Here is how the two systems compare across the features that matter most:
| Feature | Ghost II Immobiliser | Thatcham S5 Tracker |
|---|---|---|
| Primary purpose | Stop the engine starting | Locate and recover the vehicle |
| How it works | PIN code via dashboard buttons | GPS + GSM with control centre |
| Theft prevention | ✓ Car cannot be driven away | — Does not stop theft |
| Theft recovery | — No recovery feature | ✓ 24/7 police liaison |
| Ongoing fees | None | ~£150–£200 per year |
| Insurance discount | ✓ Up to 10–15% | ✓ Up to 15–20% |
| Best for | Keyless-entry vehicles, daily drivers | Range Rover, BMW, high-value cars |
| Typical install cost | £499 | £189–£999 |
UK insurers have moved beyond single-device policies. The fastest-growing theft methods — relay attacks, key cloning and recovery-truck theft — each bypass different security layers. A single system leaves a gap.
This is why insurers for Range Rover, Land Rover Defender, BMW X-series and Mercedes G-Wagon now commonly specify "Ghost immobiliser plus Thatcham S5 tracker" as a condition of theft cover. It is not upsell — it is actuarial logic.
The right setup depends on your vehicle, your insurer and your budget. Here is our straightforward guidance:
Ghost II only: Best for standard family cars where your insurer does not require a tracker. The Ghost stops the most common theft methods and has no ongoing fees. Ideal if you want solid protection without subscriptions.
S5 Tracker only: Rarely recommended. A tracker without an immobiliser means thieves can drive your car away and you rely entirely on recovery. Some insurers accept this for older vehicles, but it leaves you exposed.
Ghost II + S5 Tracker bundle: The gold standard for high-value and keyless-entry vehicles. The Ghost prevents the car starting; the S5 ensures recovery if it is moved by other means. This is what most insurers now require for Range Rover, BMW, Mercedes and similar premium vehicles. Bundles are usually cheaper than separate installs.
Still unsure? WhatsApp us your vehicle registration and insurer name. We will check exactly what your policy requires and quote the right system — no upsell, just the protection you need.
An immobiliser like the Autowatch Ghost II stops the engine from starting unless a secret PIN is entered. A tracker like the Thatcham S5 does not stop the car — it locates and recovers the vehicle after a theft by working with a 24/7 control centre and police. One prevents; the other recovers.
For maximum protection, you need both. The Ghost stops thieves from driving the car in the first place. The S5 tracker ensures that if the car is moved — for example, on a recovery truck — it can be located and recovered quickly. Many insurers now require layered protection: both an immobiliser and a tracker.
No. A tracker cannot stop a theft. It can only help recover the vehicle after it has been taken. That is why trackers are paired with immobilisers for high-value vehicles. The immobiliser is your first line of defence; the tracker is your safety net.
Insurers have seen that no single device prevents every theft method. Relay attacks, key cloning and recovery-truck thefts all bypass different security layers. By requiring both an immobiliser and a monitored tracker, insurers spread the risk: the immobiliser prevents most thefts, and the tracker ensures recovery if the vehicle is moved.
For some vehicles and insurers, yes. But for high-value cars like Range Rover, BMW X-series and Land Rover Defender, most insurers now insist on both a Ghost II immobiliser and a Thatcham S5 tracker. The Ghost stops the car being driven; the S5 ensures it can be found if it is moved by other means.
A Ghost + Tracker bundle combines the Autowatch Ghost II immobiliser with a Thatcham S5 or S7 tracker in one installation. You get layered protection — the Ghost prevents the car starting, and the tracker provides live location and 24/7 monitoring. Bundles are often cheaper than installing each system separately and satisfy the strictest insurance requirements.
WhatsApp us your vehicle reg and insurer. We will confirm whether you need a Ghost, an S5 tracker, or both.
