- (void)viewDidLoad {
[super viewDidLoad];



[self.mapView setRegion:MKCoordinateRegionMake(self.location.coordinate, MKCoordinateSpanMake(0.02, 0.02))];
[self configureOverlay];

[[self locationManager] startUpdatingLocation];

}

CircleOverlay *overlay = [[CircleOverlay alloc] initWithCoordinate:self.location.coordinate radius:self.radius];

    [self.mapView addOverlay:overlay];

    GeoQueryAnnotation *annotation = [[GeoQueryAnnotation alloc] initWithCoordinate:self.location.coordinate radius:self.radius];

    [self.mapView addAnnotation:annotation];

CLLocation *location = _locationManager.location;

    CLLocationCoordinate2D coordinate = [location coordinate];

@interface YourClass () <CLLocationManagerDelegate>

#pragma mark CLLocationManagerDelegate Methods
    - (void)locationManager:(CLLocationManager *)manager
        didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
//You can change the overlay coordinates here. Even with an animation if you want.

    }

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSString *errorType = (error.code == kCLErrorDenied) ? @"Access Denied" : @"Unknown Error";
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error getting Location"message:errorType delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil];
    [alert show];
}

self.locationmanager.delegate = self;