This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2020.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The altitudeAccuracy read-only property of the GeolocationCoordinates interface is a strictly positive double representing the accuracy, with a 95% confidence level, of the altitude expressed in meters. This value is null if the implementation doesn't support measuring altitude.
A positive double representing the accuracy, with a 95% confidence level, of the altitude expressed in meters.
| Specification |
|---|
| Geolocation> # altitude-and-altitudeaccuracy-attributes> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
altitudeAccuracy |
5 | 12 | 3.5 | 1610.6–15 | 5 | 18 | 4 | 1611–14 | ≤3 | 1.0 | 4.4 | ≤3 |
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https://developer.mozilla.org/en-US/docs/Web/API/GeolocationCoordinates/altitudeAccuracy