GPS TRACKERS
GPS Trackers Explained: What Each Type Does, How They Work, and What to Watch For
Cellular. Bluetooth. LoRa. Satellite. Each tracker type works differently, costs differently, and gets used in a different context. Some transmit constantly. Some only wake up when you move. Some never broadcast a signal at all and cannot be detected by RF or Bluetooth scanning. This is the complete breakdown.
// Location tracking hardware - accessible to anyone, for under £30
If you've just found something on your car, got an unexpected tracker alert on your phone, or started suspecting someone knows where you are - this article is for you. GPS tracking hardware is cheap, accessible, and widely misused. Understanding what type of device you might be dealing with is the first step to knowing whether you can find it, and how.
Skip straight to the detection section. It covers what equipment finds what, why a single sweep isn't enough, and why some trackers cannot be detected by RF or Bluetooth scanning at all.
Jump to detection methods ↓The rest of this article breaks down every major tracker type - what it is, how it works, who uses it, and what you can do about it. The threat ratings reflect Espionic's operational assessment based on cost, ease of deployment, and observed real-world use cases.
Cellular GPS Trackers - 2G / 4G / LTE-M
Cellular trackers are the most capable covert tracking devices available to the general public. They use a SIM card to connect to the mobile network and report GPS coordinates, typically every few seconds, to an app or server that whoever placed the device controls.
The hardware is small, often magnetic, weather-hardened, and built with battery life measured in weeks. A cellular tracker hidden in a wheel arch, underneath a chassis, or inside luggage needs no proximity to operate. It reports from anywhere with mobile signal. Whoever is monitoring you could be anywhere in the world watching a live dot move across a map on their phone.
// Most Likely Used On You For
Covert vehicle tracking by private investigators, employers, or individuals with physical access to your vehicle. A PI does not need to physically follow a car when a £30 magnetic tracker on a data SIM tracks it more reliably with no risk of being spotted. The devices are legal to purchase and freely available. Placing one on a vehicle without lawful authority or the owner's consent can carry serious legal consequences, though that rarely acts as a deterrent.
BLE Trackers - AirTag, Tile & Chipolo
BLE trackers do not use the mobile network. They exploit something far more powerful: the density of smartphones around you at all times. Any nearby Apple device participating in the Find My network silently detects an AirTag's Bluetooth signal and relays its location back to Apple anonymously. Samsung operates an equivalent system through its SmartThings Find network, which works the same way across Galaxy devices. The person who placed the tag sees a near-real-time location update on their phone. The device that reported it never knows it helped.
What makes these trackers particularly effective as surveillance tools is the sheer density of the networks they piggyback on. In any city, transport hub or shopping centre, a tag placed in your bag, jacket pocket or vehicle will be reporting its location continuously without ever connecting to a cellular network, buying a SIM, or leaving any commercial paper trail.
// BLE trackers - coin-sized, coin-cell powered, and in the hands of anyone
// The Crowd-Sourced Network Effect
- Apple said in 2021 that the Find My network was approaching one billion devices; its broader active device base has grown significantly since, making this the densest crowd-sourced location network in existence
- Tile and some Chipolo models rely on their own app-based user networks, though those are significantly smaller than Apple's Find My ecosystem
- In any populated area (city centre, transport hub, shopping centre) location updates happen continuously
- The tag itself never connects to the internet. The crowd does the reporting
- Tags are coin-cell powered, last up to a year per battery, and are roughly the size of a 50p coin
- iPhone and Android devices support alerts for unknown Bluetooth trackers, though coverage varies by manufacturer and depends on whether the device supports the 2024 DULT (Detecting Unwanted Location Trackers) specification
- Apple's anti-stalking protections have been expanded over time, but they are not instant and not foolproof
// Most Likely Used On You For
Stalking and monitoring by someone with physical access to your belongings. An AirTag costs £29, fits inside a bag lining, slips into a jacket pocket, or clips magnetically under a car. The Find My network means it works everywhere Apple devices exist, which is essentially everywhere. Reports of AirTags being misused began surfacing within weeks of the product launching in 2021. The anti-stalking alerts are a partial fix. They are not a complete one.
LoRa / LoRaWAN - Long Range Radio Tracking
LoRa (Long Range) is a radio protocol designed for low-power devices that need to transmit data over long distances without a SIM card or commercial subscription. In open terrain, LoRa devices can communicate with gateways several kilometres away. In urban environments, building density typically reduces effective range to under a kilometre. Those gateways then forward location data to the internet.
Until recently this was primarily an industrial tool. That is changing. Meshtastic, an open-source project turning cheap LoRa hardware into a self-organising mesh network, has made LoRa-based tracking more accessible to hobbyists and technically capable users. Critically, a Meshtastic network requires no internet connection at all. Location data is transmitted and received entirely between mesh nodes and devices on the network. The growing deployment of these nodes by the hobbyist community is actively extending effective range beyond what any single gateway could cover, with each new node acting as a relay for others. This was a niche threat. It is becoming a mainstream one.
// Low-cost LoRa GPS hardware - no SIM, no account, no paper trail
// Why LoRa Is a Growing Concern
- Signals travel several kilometres in open terrain on a single small battery - with no SIM, no fees, no subscription
- Low-cost GPS + LoRa hardware is widely available online
- No commercial mobile network dependency removes the obvious subscriber trail you would see with a SIM-based tracker
- Meshtastic has lowered the technical barrier to building a long-range tracker with no commercial paper trail
- As coverage grows, this moves from a niche threat toward a more mainstream one
// Most Likely Used On You For
DIY covert tracking by technically capable individuals who want no commercial paper trail. No SIM registration. No app store purchase. No account. A LoRa tracker is significantly harder to trace back to whoever placed it than a cellular unit. This is not theoretical. It is an emerging and growing capability.
UWB & Satellite - Why These Usually Aren't A Threat
Ultra-Wideband (UWB) is a short-range radio technology accurate to within centimetres. It is built into recent iPhones, Samsung Galaxy devices, and the Apple AirTag, where it powers the precision finding feature that guides you to a lost item in the final few metres. Its maximum effective range of roughly 10–60 metres (depending on hardware and conditions) makes it impractical for covert tracking. If someone is within UWB range, they are close enough to wave at you!
Satellite trackers - such as the Garmin inReach - communicate directly with orbiting satellites and work anywhere on earth. The technology is capable, but the hardware costs £250 to £600+, requires an ongoing satellite subscription, is bulkier than any BLE or cellular alternative, and updates positions every 2 to 30 minutes depending on configuration - not in real time. In areas with mobile coverage, low-cost cellular trackers are cheaper and more practical for frequent location updates than satellite devices.
The Tracker Most Likely Being Used on You Right Now
Not all trackers carry the same real-world risk. Based on cost, accessibility, ease of deployment, and documented use cases, here is how they rank.
#1 Cellular (2G/4G/LTE-M). The most commonly used tool for covert vehicle tracking. Cheap, magnetic, and widely available, it is the tool of choice for private investigators, employers, and individuals with access to a target's vehicle. No technical knowledge is required to operate one and a low-cost data SIM is the only ongoing expense.
#2 BLE (AirTag / Tile / Samsung SmartThings). Widely misused for stalking and personal surveillance. At under £30, these tags fit inside a bag lining, clip under a car, or slip into a jacket pocket in seconds. They report location continuously through existing phone networks without ever requiring a SIM or account - the most likely tool used by someone who had brief physical access to your belongings.
#3 LoRa / Meshtastic (and rising). No SIM, no account, no commercial trail of any kind. Hardware is low cost and freely available online. This was a niche threat. It is becoming a mainstream one.
UWB and satellite trackers represent low and very low risk respectively. Neither is a practical covert tracking tool in most real-world circumstances.
Methods of Detection
Knowing the tracker types is one half. This is the other - and it matters just as much, because the method of detection depends entirely on what type of device has been placed.
The primary tool for detecting active trackers is an RF receiver or spectrum analyser. These devices scan across a defined frequency range and identify transmissions that should not be there. A basic handheld RF detector will flag strong nearby signals, while a software-defined radio (SDR) paired with analysis software gives a more complete picture, allowing you to identify the specific frequency, modulation type, and transmission pattern of anything broadcasting in range. Cellular trackers typically transmit in the 700MHz to 2600MHz range depending on the network band. LoRa devices operate in the 868MHz ISM band in the UK. A thorough sweep covers both.
// Active RF sweep inside a vehicle - the kind of scan used to detect transmitting devices
BLE trackers such as AirTags require a different approach. They operate in the 2.4GHz Bluetooth band and are best detected using Bluetooth scanning - either the built-in unknown tracker alerts on iOS and Android, or a dedicated Bluetooth scanner app. This is considerably more accessible than SDR and is often the first line of detection for personal-item surveillance.
Spectrum analysis alone is not enough. The following limitations apply regardless of the equipment used.
Some trackers never transmit at all. Passive GPS loggers record location data internally with no live signal. They are physically retrieved and the data downloaded afterwards. No scanner will ever find them. Physical inspection is the only method.
Some only transmit when moving. Many cellular and LoRa units use motion sensors to wake up only when your vehicle moves. A sweep of a parked car may return nothing. The device only becomes detectable once you are already on the road, at which point vehicle interference can mask the signal further.
Even active trackers may only ping every few minutes. A sweep at the wrong moment catches nothing from an otherwise live device. Professional detection requires a combination of physical inspection, Bluetooth scanning, broadband RF scanning, and SDR-based signal analysis across the relevant frequency bands. A single sweep is not a clean bill of health.
