We worked over the solution again. Now in addition to the phone app, we though of making a connected wristband. As a technical project, it would have to be connected to the phone app. If the user is present in an area that the app detect to be "with risks of avalanche", then the app would send a signal to the wristband and it would start to vibrate, hence warning easily the user even if they would be skiing at that moment.
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