marker3 = new google.maps.Marker({
      position: new google.maps.LatLng(50.506658, 30.450565),
      map: map,
      title: 'Старт!',
	  icon: {
        path: google.maps.SymbolPath.BACKWARD_CLOSED_ARROW,
		scale: 7,
		strokeWeight : 4,
		strokeColor: "#00FF00",
		strokeOpacity: 0.9,
		rotation: 100           }
  });

 function ChangeMarkerPosition() {
    var latlng = new google.maps.LatLng(50.505, 30.4490);
    marker3.setPosition(latlng);
	//marker3.icon.setRotation(300);
	//marker3.icon.rotation: 100;
	//marker3.Icon.setIconAngle(300);
	
};