GPS Accuracy Test

How it works

1. Open the page on your phone and allow location access.
2. Start tracking: the current position and its accuracy in metres update as your device receives satellites.
3. Watch the accuracy chart settle before you record points. You can install the page as an app to use it in the field.

Everything runs in your browser. Your files are never uploaded to our servers.

Input and output

Input

Your device's location, once you allow the page to use it.

Output

The live position, its accuracy in metres, and a chart of how the accuracy changes over time.

Example

Three readings from a phone, with an accuracy of 4.2 m, 12 m, 35 m.

±4.2m in green (5 m or better) · ±12.0m in yellow (up to 20 m) · ±35.0m in red (worse than 20 m)

Limits

• The accuracy is your device's own estimate of the error. The real error can be larger, for example under trees or near buildings.
• It needs location access, and phones usually pause location when the screen locks or the page is in the background, so keep it open.
• Your position stays on your device. Like the rest of the site, the page sends usage analytics, including GPS error reports, but never your coordinates.

Questions