Tryit Editor v1.8

Source Code:

<!DOCTYPE html>
<html>
<head>
<script
src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDY0kkJiTPVd2U7aTOAwhc9ySH6oHxOIYM&sensor=false">
</script>

<script>
var map;
var myCenter=new google.maps.LatLng(45.434046,12.340284);

function initialize()
{
var mapProp = {
  center:myCenter,
  zoom:18,
  mapTypeId:google.maps.MapTypeId.HYBRID
  };

map=new google.maps.Map(document.getElementById("googleMap"),mapProp);
}

google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

<body>
<button onclick="alert(map.getHeading());">Drag the compass wheel and get heading/degrees</button>
<br><br>
<div id="googleMap" style="width:500px;height:380px;"></div>
</body>
</html>

Result:

W3Schools.com - Try it yourself

Edit the code above and click "Submit Code" to see the result.