Most GPS trackers find their position to within 3 to 15 metres. A good standalone tracker can get within 1 metre in ideal conditions, while a smartphone is usually accurate to 3 to 5 metres. Tall buildings, tunnels and weak signals make any tracker less accurate, but most of these errors are temporary or easy to fix.
GPS (Global Positioning System) technology is now central to modern navigation. People use it to track vehicles, assets and even loved ones with great precision. It works with signals from satellites that orbit the Earth, which a GPS tracker uses to work out where a person or object is.
Even with advanced technology, some things can affect GPS accuracy. This article explains how GPS accuracy works, where it does well, and where it can fall short.
How Accurate Is GPS, and Why?
Most GPS trackers can pinpoint their position to within 3 to 15 metres. The exact range depends on the quality of the tracker, the type of technology and the conditions around it. They get there with a method called trilateration.
To work out its position on Earth, a GPS tracker needs signals from at least 4 satellites. Each satellite sends a signal stamped with the time. The receiver measures how long each signal takes to arrive and uses that to find its exact location.
Why Is GPS Less Accurate in Cities?
GPS is less accurate in cities because tall buildings often block satellite signals. This is one of the most common GPS tracking problems, as it makes it hard for a device to lock onto its location.
To get around this, many devices use Assisted GPS (A-GPS). A-GPS combines satellite data with information from cell towers and Wi-Fi networks. This lets the device estimate its position even when satellite signals are weak.
A-GPS greatly improves accuracy in cities with tall buildings. It also gets a location lock faster, which is especially useful in built-up areas.
Are GPS Trackers More Accurate Than Smartphones?
Yes, standalone GPS trackers are usually more accurate than smartphones, because they are built just for tracking and navigation. Not all GPS devices are equal. Dedicated trackers can sometimes get within 1 metre in ideal conditions.
Smartphones are handy, but they usually offer an accuracy of 3 to 5 metres. The US government site GPS.gov says phones are typically accurate to within 4.9 metres under open sky. Our guide to Find My Phone vs a GPS tracker compares the two in more detail.
One reason for the gap is that phones run many apps at once, which can interfere with GPS. Standalone trackers do just one job, so their readings stay steadier and more accurate. For fleet managers, security staff and anyone else who relies on precise location data, a dedicated GPS tracker is often the best choice.
How Do Businesses Use Accurate GPS Tracking?
Businesses use accurate GPS tracking to run their operations, plan routes and cut costs. In many industries it is not just handy, it is a business need. Logistics, construction and field service firms all use it to run smoothly, use resources well and keep track of staff.
In fleet management, GPS tracking helps companies make sure drivers follow planned routes, cut fuel costs and avoid delays. With precise tracking, logistics firms can meet delivery times more reliably and track valuable assets in real time.
Accurate GPS tracking can also save a lot of money. For example, AV Decking, a construction company, moved to a GPS-based time-tracking system. It expected to save up to $200,000 a year by cutting payroll errors and time theft, according to a Workyard case study (undated, published by the software maker). This case shows the real savings and productivity gains that accurate GPS tracking can bring.
What Is Differential GPS (DGPS)?
Differential GPS (DGPS) is a high-precision form of GPS, used for work such as scientific research and land surveying. It improves on normal GPS by using reference stations on the ground to correct signal errors. This allows measurements down to centimetre precision.
DGPS is more precise than everyday use needs. Even so, it is vital in fields that demand exact location data, such as environmental monitoring, scientific research and building infrastructure. It shows how GPS has been adapted to meet special needs for centimetre-level accuracy.
Why Does Battery Life Matter in a GPS Tracker?
Battery life matters because frequent recharging can leave gaps in your tracking data. It is a key part of what to look for in a GPS tracker, especially for fleet managers or anyone tracking assets over the long term.
Dedicated GPS trackers usually last much longer than smartphones on one charge, often for weeks or even months. For businesses, this long battery life means less downtime, less upkeep and tracking without breaks.
For example, fleet managers rely on trackers with long battery life to track vehicles all the time. That makes long battery life vital for reliable fleet management and other long-term tracking.
How Is GPS Tracking Used for Safety and Security?
Police and families both use GPS tracking to keep people safe. Law enforcement agencies often use GPS data to investigate crimes, track suspects and rebuild crime scenes. In some criminal cases, GPS evidence has become a key part of the proof, as it can confirm or disprove an alibi.
Personal GPS trackers also help people keep track of family members and pets. Parents can use GPS to check where their children are or to look in on older relatives, and pet owners use it to find pets that tend to roam. These uses show how GPS can protect people in both public and private life, and give peace of mind in many situations.
What Makes a GPS Tracker Inaccurate?
Four things can make a GPS tracker inaccurate or cause it to fail: things in the way, bounced signals, lost signal and long gaps between uses. Even with recent advances, GPS trackers are not free from error. Our guide to how a GPS tracker works covers the basics.
- Environmental Interference: Mountains, tunnels, bridges and tall buildings can block or distort GPS signals, so accuracy drops for a while.
- Multipath Effect: In cities, GPS signals can bounce off buildings or other objects. The device then reads the signals wrongly, which lowers accuracy.
- Signal Loss: When a GPS tracker loses its satellite link, it may keep logging its location and upload the data once the link comes back. This can leave gaps in live tracking, but they are usually short-lived.
- Infrequent Use: A GPS tracker that has not been used for a while may take longer to reconnect. A second activation to recalibrate it usually fixes this.
These issues can hurt GPS performance, but most are short-lived or easy to fix with basic troubleshooting.
How Do I Fix an Inaccurate GPS Tracker?
Start with the app, then reset the tracker, and contact support if the problem stays. Here is what each step involves if your GPS tracker shows the wrong location:
- Check the App: Sometimes a fault in the tracking app causes errors. Restart the app or check for updates to rule it out.
- Reset the Tracker: Turn the tracker off for a few minutes, then turn it back on to recalibrate it.
- Contact Support: If the problem keeps coming back, contact the support team at your GPS provider. Most providers will help to troubleshoot or repair trackers as needed.
Does GPS Work Indoors?
GPS does not work well indoors, because satellite signals struggle to get through walls and other structures. For indoor tracking, or places where GPS signals are blocked, other tools can help over short distances. These include Bluetooth Low Energy (BLE) beacons and Radio-Frequency Identification (RFID) tags.
These options lack the range and accuracy of GPS. Even so, they are widely used in warehouses, shops and other small, controlled spaces where GPS does not work. BLE and RFID offer a different kind of accuracy, useful where knowing what is close by matters more than tracking over a wide area. By combining them with GPS, businesses can track things both indoors and outdoors.
Is GPS Accurate Enough for Everyday Tracking?
Yes, GPS is accurate and reliable enough for most personal, business and public safety uses. It has changed modern life, with uses from asset tracking to navigation and safety. Our guide to GPS tracker features explains what makes a tracker reliable.
Signal loss and things in the way can still affect how well it works. Advances such as Assisted GPS and Differential GPS, and other tools like BLE and RFID, help solve these problems in their own ways.
Knowing about GPS accuracy, tracker options and uses helps you choose what suits your needs. To learn more about GPS, what it can do and how to fix common problems, visit Solid GPS support.
Solid GPS trackers send live 4G location updates to your phone. Updates as often as every 2 minutes on the move.
