In reply to kevin stephens:
The FastFind PLB's we use send a signal to a "rescue co-ordination centre" (which I believe is in France) who then forward your distress details to the relevant authorities in the area your signal is received from, including the details you provided when you registered. IIRC it also contacts next of kin.
What brand of PLB are you using? I would imagine it uses the a similar system of notification, thus can be used globally and the centre that receives the signal will contact the most suitable rescue service.