GPS Accuracy Checker
Monitor your device's real-time GNSS satellite positioning accuracy, horizontal precision radius, and sensor telemetry.
Standby
Live Horizontal Accuracy Radius
± — m/± — ft
Awaiting GPS LockUpdates every second
Estimated HDOP—
Ground Speed—
Compass Heading—
Altitude—
Vertical Accuracy—
Active Coordinates—
Understanding GPS Accuracy & Dilution of Precision (DOP)
Browser and smartphone geolocation accuracy is expressed as a 95% confidence radius. If your device reports an accuracy of ±5 meters, there is a 95% probability that your true geographic position lies within a circle of 5 meters around the reported coordinates.
Accuracy Classifications
| Accuracy Radius | Rating | Typical Source | Use Case Suitability |
|---|---|---|---|
| < 3 m (10 ft) | Exceptional | Dual-Frequency L1/L5 GNSS | Precision mapping, surveying, lane-level navigation |
| 3 - 8 m (10–26 ft) | High | Standard Mobile GPS / GLONASS | Turn-by-turn driving, hiking, fitness tracking |
| 8 - 25 m (26–82 ft) | Moderate | Wi-Fi Positioning (WPS) / Indoor | Neighborhood-level delivery, local search |
| > 25 m (82+ ft) | Low | Cell Tower Triangulation / IP Geo | City-level regional discovery only |
How to Improve Your Device's GPS Accuracy
- Enable Wi-Fi and Bluetooth Scanning: Mobile operating systems use nearby Wi-Fi router BSSIDs to accelerate initial satellite acquisition (Assisted GPS).
- Step Away from 'Urban Canyons': Tall concrete and glass skyscrapers reflect satellite signals, creating multipath interference that degrades accuracy.
- Calibrate the Internal Magnetometer: Move your device in a figure-8 motion to recalibrate the electronic compass for accurate heading bearings.
- Ensure Unobstructed Sky View: Heavy foliage, subterranean basements, and metallic structures attenuate high-frequency satellite microwave signals.