//clear route and calculate a new one
[[SKRoutingService sharedInstance]clearCurrentRoutes];
[[SKRoutingService sharedInstance] clearAllRoutesFromCache];
[[SKRoutingService sharedInstance] clearRouteAlternatives];
[[SKRoutingService sharedInstance] startRouteFromGPXFile:fname];
[self.container addSubview:self.mapView];

//on calculation finish
- (void)routingService:(SKRoutingService *)routingService didFinishRouteCalculationWithInfo:(SKRouteInformation*)routeInformation{
    NSLog(@"Route is calculated.");
    [routingService zoomToRouteWithInsets:UIEdgeInsetsZero]; // zoom to current route
}