GSM triangulation alone is very accurate, no need for GPS for emergencies, especially given the fact that if you report an emergency using your cell phone, then you can always be located. With GPS you don't have that comfort, as you can be e.g. in a tunnel, not to mention time to get a GPS fix (triangulation is instant).

I'm not sure if emergency services are able to get your location anyway, even if they can, I'm not sure if it's deployed in every country with GSM networks, can anyone confirm/deny?