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PGHM, Gendarmerie de Haute Montagne
The PGHM is a military police organisation and in Chamonix they are the elite experts of mountain rescue. It is possible to send an sms to their phone number if you are in need of aid. Remember to be precise:
WHO? your name and phone number
WHAT? type of accident, number of victims, seriousness of injuries
WHERE? exact location (eg,route, altitude, GPS)
WHEN? time of accident
WEATHER? the weather conditions in your location