A Geolocation Override Tester is a tool that lets developers and testers simulate GPS coordinates to test location-based features in web applications. Instead of physically traveling to different places, you can input any latitude/longitude pair and preview the exact GeolocationPosition object that the browser's navigator.geolocation.getCurrentPosition() API would return. This is extremely useful for debugging region-specific content, map integrations, store locators, and any feature that depends on the user's physical location.

In Chrome / Edge: Open Developer Tools (F12), press Ctrl+Shift+P (or Cmd+Shift+P on Mac), type "Sensors", and open the Sensors panel. Under the "Location" dropdown, select "Other..." and enter your desired latitude and longitude. You can also choose from preset cities.

In Firefox: Type about:config in the address bar, search for geo.provider.network.url, and modify it to return custom coordinates. Alternatively, use the Location Guard extension.

In Safari: Enable the Develop menu, go to Develop → Connect Hardware → Location, and select a custom location or use an iOS simulator.

Latitude measures how far north or south a point is from the equator. It ranges from -90° (South Pole) to +90° (North Pole). The equator is at 0° latitude.
Longitude measures how far east or west a point is from the Prime Meridian (Greenwich, UK). It ranges from -180° to +180°. Positive values are east, negative values are west.

Together, a (latitude, longitude) pair pinpoints any location on Earth — for example, (40.7580, -73.9855) is Times Square in New York City.

The accuracy property in a GeolocationCoordinates object represents the radius of uncertainty around the reported position, measured in meters. A lower value means higher confidence. GPS typically provides accuracy between 3–30 meters, while IP-based geolocation may have accuracy of hundreds or thousands of meters. When simulating, you can set this to any realistic value to test how your app handles varying precision levels.

Yes! The GeolocationCoordinates object includes optional properties: altitude (height above sea level in meters), altitudeAccuracy (uncertainty of the altitude), heading (direction of travel in degrees, 0–360), and speed (velocity in meters per second). This tool lets you set altitude and altitude accuracy. For full motion simulation (heading + speed), Chrome's Sensors panel supports those as well.

This tool uses the free Nominatim service by OpenStreetMap for reverse geocoding (converting coordinates to a human-readable address). It's generally accurate at the street and building level in well-mapped urban areas, though coverage varies in rural or less-mapped regions. For production use, consider dedicated services like Google Maps Geocoding API, Mapbox, or HERE. Nominatim has a usage limit of ~1 request per second, so we debounce requests accordingly.

Testing different locations is critical for: (1) Region-specific pricing or currency display, (2) Localized content and language detection, (3) Store locators and "near me" features, (4) Compliance with regional laws (GDPR, data residency), (5) Timezone-sensitive features, (6) Delivery zone validation, and (7) Debugging location-related bugs reported by users in specific areas.

No. This tool is a simulator and tester — it shows you what the geolocation data would look like for any given coordinates, but it does not modify your browser's actual navigator.geolocation output. To truly override your browser's location, use the Chrome DevTools Sensors panel as described above, or install a browser extension designed for location spoofing. This tool helps you prepare the exact coordinates and preview the data before applying the override.