This program has been designed to be a safety assistant in mountain activities, but also in general in any activity that takes place in the natural environment. It is designed to help choose and prepare the activity, then to perform it safely, and when the time comes, advise on the actions of self-rescue and collaboration with the professional rescue. Evidently these techniques have to be trained, for which the program will guide us step by step. It would be a mistake to think that by carrying this program on the mobile phone, we can venture freely in nature. Therefore we must train together with the program until we master the techniques, and at that time we can use the program on the mobile as a "chop" that refreshes the memory in case you have to use it in an emergency situation. The reading of this program aims to complete and guide, but in no case replace the teaching provided by clubs, federations, mountain schools, or lifeguard instructors. The authors have tried to present in a clear and simple way the techniques and procedures presented here, not taking responsibility for their application. It is recommended to take certified and accredited courses of self-help and first aid for a correct application of their techniques.