A system integrated in a helmet or another headgear, for the registration of direct violence against the head/body that a wearer of the helmet is subjected to in connection with an accident, comprising at least one sensor (12) intended to detect movements, at least one sensor for measuring vital data, a unit (13) arranged to register and receive data from the sensor and calculate at least one parameter of the head movement, based on said calculations, the unit being arranged to identify when an accident has occurred and to store data a certain time before the accident and stop storing a certain time after the accident as well as to generate an alarm and transmit information related to the accident to a receiver. Furthermore, the system is arranged to recreate the course of events based on registered, stored and processed data in order to provide as correct a picture of the accident as possible, and to monitor how vital data are developing after the accident so that the ill-fated thereby should get as quick and correct care as possible.