The ANENA (French Association for the Study of Snow and Avalanches) has analyzed 368 avalanche incidents between 2004-2010 and as a result have some important recommendations. With the widespread use of Recco detectors by the rescue services they say that off piste skiers consider using both reflectors and an avalanche beacon. While companion rescue remains important for survival rates, especially for off-piste skiers, the rescue services should be involved as soon a possible without jeopardizing the search of any victims. Calling the local PGHM or piste service number is fastest but you will need to give your exact location (reference points: valley name, summit/passes, altitude) as well as the number of victims.