Merge pull request #7743 from fredj/enableHighAccuracy

Set enableHighAccuracy in geolocation example

examples/geolocation.js

@@ -34,6 +34,10 @@ const map = new Map({
 });
 
 const geolocation = new Geolocation({
+  // enableHighAccuracy must be set to true to have the heading value.
+  trackingOptions: {
+    enableHighAccuracy: true
+  },
   projection: view.getProjection()
 });
 

src/ol/Geolocation.js

@@ -246,6 +246,8 @@ Geolocation.prototype.getAltitudeAccuracy = function() {
 
 /**
  * Get the heading as radians clockwise from North.
+ * Note: depending on the browser, the heading is only defined if the `enableHighAccuracy`
+ * is set to `true` in the tracking options.
  * @return {number|undefined} The heading of the device in radians from north.
  * @observable
  * @api