Get GPS From using CLLocationManager

GPSViewController.h

// view GPSViewController.h file
// Step 1: add CoreLocation framework in Project 
// Step 2: include the CoreLocation.h file
// implement the following codes
 
#import <CoreLocation/CoreLocation.h>
@interface GPSViewController : UIViewController <CLLocationManagerDelegate> {
    CLLocationManager *locationManager;
}
 
@end

GPSViewController.m

// view controller .m file

#import "GPSViewController.h"

@implementation RRScrollView
 
// init the location manager in the viewDidLoad
- (void)viewDidLoad
{
    [super viewDidLoad];
 
    // initialize the GPS
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
}
 
// check whether GPS is enabled
- (BOOL) isGPSEnabled
{
    if (! ([CLLocationManager  locationServicesEnabled])
        || ( [CLLocationManager  authorizationStatus] == kCLAuthorizationStatusDenied))
    {
        return NO;
    }
    return YES;
}
 
// function to start capture GPS, we check settings first to see if GPS is disabled before attempting to get GPS
- (void) getGPS
{
    if([self isGPSEnabled])
    {
        // Location Services is not disabled, get it now
        [locationManager startUpdatingLocation];
    }
    else        
    {
        // Location Services is disabled, do sth here to tell user to enable it
    }
} 
 
// receiving the gps and stop it immediately (one time gps only for this example)
- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation
{
    int degrees = newLocation.coordinate.latitude;
    double decimal = fabs(newLocation.coordinate.latitude - degrees);
    int minutes = decimal * 60;
    double seconds = decimal * 3600 - minutes * 60;
    NSString *latValue = [NSString stringWithFormat:@"%d° %d' %1.4f\"", 
                     degrees, minutes, seconds];
 
    degrees = newLocation.coordinate.longitude;
    decimal = fabs(newLocation.coordinate.longitude - degrees);
    minutes = decimal * 60;
    seconds = decimal * 3600 - minutes * 60;
    NSString *longValue = [NSString stringWithFormat:@"%d° %d' %1.4f\"", 
                       degrees, minutes, seconds];
 
    NSLog(@"Lat: %@ Long:%@", latValue, longValue);
 
    // stop updating
    [manager stopUpdatingLocation];
}

- (void)dealloc {	
    [super dealloc];
}

@end

what does this do?
double decimal = fabs(newLocation.coordinate.latitude - degrees);