Accuracy of the IWebGeocoordinates::altitude property, in meters.
HRESULT value = object.get_altitudeAccuracy(* p);
A VARIANT value that either contains an double value indicating the accuracy of the altitude or a VT_NULL value, which indicates that the accuracy could not be determined.
- Geolocation API Specification, Section 5.4
Windows Internet Explorer 9. This property is supported only for webpages displayed in IE9 Standards mode. For more information, see Defining Document Compatibility.