gistfile1.txt

- (CLLocationCoordinate2D)locationFromLocation:(CLLocationCoordinate2D)initialLocation course:(CLLocationDirection)course distance:(CLLocationDistance)distance {
    CLLocationCoordinate2D retValue = initialLocation;
    static const CLLocationDistance EarthRadius = 6371000; // avg radius of the Earth in meters
    CLLocationDegrees newLat = 0.0;
    CLLocationDegrees newLong = 0.0;

    newLat = asin(sin(initialLocation.latitude * M_PI/180.0) * cos(distance/EarthRadius) +
                  cos(initialLocation.latitude * M_PI/180.0) * sin(distance/EarthRadius) * cos(course * M_PI/180.0) );

    newLong = initialLocation.longitude * M_PI/180.0 + atan2(sin(course * M_PI/180.0) * sin(distance/EarthRadius) * cos(initialLocation.latitude * M_PI/180.0),
                                                             cos(distance/EarthRadius) - sin(initialLocation.latitude * M_PI/180.0) * sin(newLat));

    retValue = CLLocationCoordinate2DMake(newLat * 180.0/M_PI, newLong * 180.0/M_PI);

    NSLog(@"initial: %f/%f  new: %f/%f", initialLocation.latitude, initialLocation.longitude, retValue.latitude, retValue.longitude);
    return retValue;
}