Distance calculation using Locationamanger

gistfile1.m

-(void)findCurrentLocation
{
    
    if(nil==self.locationManager)
    {
        self.locationManager= [[[CLLocationManager alloc]init]autorelease];
        
    }
    
    locationManager.delegate=self;
     //locationManager.desiredAccuracy=kCLLocationAccuracyNearestTenMeters;
    locationManager.desiredAccuracy=kCLLocationAccuracyBest;
    //locationManager.distanceFilter = kCLDistanceFilterNone;
    locationManager.distanceFilter = 2.0;
    [locationManager startUpdatingLocation];
   
}

- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray *)locations
{
    currentLocation=[locations lastObject];
     
    NSDate* eventDate = currentLocation.timestamp;
    NSLog(@"Current time stamp %@",eventDate);
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
    NSLog(@"How recent %d",abs(howRecent));
    if (abs(howRecent) < 15.0) 
    //if (howRecent < -0.0 && howRecent > -10.0)
    {
        if([locationArray count]>1)
        {
            previousLocation=[locationArray objectAtIndex:[locationArray count]-1];
            long double dist=[currentLocation distanceFromLocation:previousLocation];
            if(dist < 5.0)
            {
                totalDistance= totalDistance + dist;
                [viewControllerDelegate updateDistanceLabel];
            }
        }
    
    //NSLog(@"from singleton class lat---> %f - long---->%f", currentLocation.coordinate.latitude,currentLocation.coordinate.longitude);
        
    }
    [locationArray addObject:[locations lastObject]];
    
}