-course returns the direction of a moving object. So you would call -course on your users current location. It doesn't give you a direction from your location to another location. So unless NYC is moving, it will always return -1
If you want the find the compass heading you should be moving you can do this:
#define RAD_TO_DEG(r) ((r) * (180 / M_PI))
...
CLLocationCoordinate2D coord1 = currentLocation.coordinate;
CLLocationCoordinate2D coord2 = distLoc.coordinate;
CLLocationDegrees deltaLong = coord2.longitude - coord1.longitude;
CLLocationDegrees yComponent = sin(deltaLong) * cos(coord2.latitude);
CLLocationDegrees xComponent = (cos(coord1.latitude) * sin(coord2.latitude)) - (sin(coord1.latitude) * cos(coord2.latitude) * cos(deltaLong));
CLLocationDegrees radians = atan2(yComponent, xComponent);
CLLocationDegrees degrees = RAD_TO_DEG(radians) + 360;
CLLocationDirection heading = fmod(degrees, 360);