CLLocationManager headerAvailable devuelve falso

hola, estoy en una situación aquí, necesito ayuda sobre los datos de encabezado en ios, estoy haciendo un marco CoreLocation usado en mi aplicación
mi archivo .h

@interface ViewController : UIViewController<CLLocationManagerDelegate>{
    UIImageView *arrowImage; 
    UILabel *magneticHeadingLabel; 
    UILabel *trueHeadingLabel;
    CLLocationManager *locationManager;
}

@property (nonatomic, retain) CLLocationManager *locationManager;
@end

en archivo .m

@implementation ViewController
@synthesize locationManager;

-(void)locationManager:(CLLocationManager*)manager didUpdateHeading:(CLHeading*)newHeading {

    NSLog(@"New magnetic heading: %f", newHeading.magneticHeading);
    NSLog(@"New true heading: %f", newHeading.trueHeading);
    NSLog(@"=>%@",[NSString stringWithFormat:@"%.1fmi",newHeading.headingAccuracy]);
    NSString *headingstring = [[NSString alloc] initWithFormat:@"%f",newHeading.trueHeading];
    trueHeadingLabel.text = headingstring;
    [headingstring release];

    NSString *magneticstring = [[NSString alloc]initWithFormat:@"%f",newHeading.magneticHeading];
    magneticHeadingLabel.text = magneticstring;
    [magneticstring release];

}

-(void)getHeadInfo{
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
    self.locationManager.delegate = self;

    if ([CLLocationManager headingAvailable] ) 
    {      
        NSLog(@"Heading Available...!");
        self.locationManager.headingFilter = kCLHeadingFilterNone; 
        [self.locationManager startUpdatingHeading];

    } 
    else {
        NSLog(@"No Heading Available: ");
        UIAlertView *noCompassAlert = [[UIAlertView alloc] initWithTitle:@"No Compass!" message:@"This device does not have the ability to measure magnetic fields." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [noCompassAlert show];
        [noCompassAlert release];
    } 
}

- (void)viewDidLoad {
    [super viewDidLoad];
    arrowImage = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"right_arrow"]];
    arrowImage.frame = CGRectMake(95, 30, 128, 128);
    [self.view addSubview:arrowImage];

    trueHeadingLabel = [[UILabel alloc] initWithFrame:CGRectMake(15, 300, 250, 30)];
    trueHeadingLabel.textAlignment = UITextAlignmentLeft;
    trueHeadingLabel.textColor = [UIColor purpleColor];
    trueHeadingLabel.backgroundColor = [UIColor clearColor];
    trueHeadingLabel.font = [UIFont systemFontOfSize:13];
    trueHeadingLabel.text = [NSString stringWithFormat:@"trueHeadingLabel:"];
    [self.view addSubview:trueHeadingLabel];

    magneticHeadingLabel = [[UILabel alloc] initWithFrame:CGRectMake(15, 350, 250, 30)];
    magneticHeadingLabel.textAlignment = UITextAlignmentLeft;
    magneticHeadingLabel.textColor = [UIColor purpleColor];
    magneticHeadingLabel.backgroundColor = [UIColor clearColor];
    magneticHeadingLabel.font = [UIFont systemFontOfSize:13];
    magneticHeadingLabel.text = [NSString stringWithFormat:@"magneticHeadingLabel:"];
    [self.view addSubview:magneticHeadingLabel];

    UIButton *start = [[UIButton alloc]initWithFrame:CGRectMake(140, 310, 50, 30)];
    [start setBackgroundColor:[UIColor redColor]];
    [start setTitle:@"start" forState:UIControlStateNormal];
    [start addTarget:self action:@selector(getHeadInfo) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:start];
    [start release];
}

el caso es que sé que el simulador no devuelve los datos de rumbo, estoy usando un ipod touch, pero aún así [CLLocationManager headerAvailable] no devuelve verdadero. Esto es una especie de emergencia, por favor ayuda a alguien.