iphone UpdateLocation在3G上的工作方式与无线网络不同?

我有一个简单的mapview,它具有以下viewdidload方法和didupdate to location:

- (void)viewDidLoad {
    NSLog(@"in view did load");
    [super viewDidLoad];
    self.mapView.showsUserLocation = YES;
    self.put_url = nil;


    locationManager = [[CLLocationManager alloc] init];
    [locationManager setDesiredAccuracy:kCLLocationAccuracyNearestTenMeters];
    [locationManager setDelegate:self];

    noUpdates = 0;
    [locationManager startUpdatingLocation];

    self.availableParking = [[NSMutableArray alloc] init];
    //self.availableParking = nil;

}


- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    NSLog(@"in didupdatetolocatoin");
     if([newLocation horizontalAccuracy] < 100 && [newLocation horizontalAccuracy] > 0) {


    // Add annotation to map
    DDAnnotation *annotation = [[DDAnnotation alloc] initWithCoordinate:newLocation.coordinate title:@"Park Here?"];

    MKCoordinateRegion region;
    MKCoordinateSpan   span;
    span.latitudeDelta = 0.05;
    span.longitudeDelta = 0.05;


    region.span = span;
    region.center = newLocation.coordinate;



    self.mapView.region = region;



    NSLog(@"in didupdatetolocation");
    noUpdates++;
         NSLog(@"IN UPDATELOCATION NOUPDATES = %d",noUpdates);
    if (noUpdates == 1) {
        [self.mapView addAnnotation:annotation];
        NSLog(@"ADDED ANNOTATION IN didUpdateToLocation!!");


        [locationManager stopUpdatingLocation];
        [self.settingsViewController setState:self.mapView.userLocation.subtitle andCity:@"fuckface"];



        NSLog(@"STOPPED UPDATING LOCATION");


        UpdateLocation *updatedLocation = [[[UpdateLocation alloc] initWithUserid:@"fuckface" andCoordinate:newLocation.coordinate withMapViewController:self]
                                           autorelease];
        NSLog(@"Lat = %f, Long = %f",newLocation.coordinate.latitude,newLocation.coordinate.longitude);
        //[NSThread detachNewThreadSelector:@selector(getLocations) toTarget:self withObject:nil];
        [[NSNotificationCenter defaultCenter]
         addObserver:self
         selector:@selector(sendUpdate)
         name:@"NoteFromOne"
         object:updatedLocation]; 


        }
    // We only update location once, and let users to do the rest of the changes by dragging annotation to place they want

        }  else {
            NSLog(@"Accuracy not good enough %lf", [newLocation horizontalAccuracy]);

        }



}

以下是几个屏幕截图:

使用3G: alt text http://www.freeimagehosting.net/uploads/fe7fcbb2ea.jpg

使用wifi: alt text http://www.freeimagehosting.net/uploads/6b653e60a7.jpg