DispatchQueue.main.async {
        for _ in self.lat{
            self.rotateMarker(coordinates: CLLocationCoordinate2DMake(self.lat[count], self.lon[count]), degrees: 0, duration: 3.0 )
            count += 1
        }
    }

func rotateMarker(coordinates: CLLocationCoordinate2D, degrees: CLLocationDegrees, duration: Double) {

    // Movement
    CATransaction.begin()
    CATransaction.setAnimationDuration(duration)
    rotatingMarker.position = coordinates

    // Center Map View
    let camera = GMSCameraUpdate.setTarget(coordinates)
    mapView.animate(with: camera)

    CATransaction.commit()
}