Abstract: A helmet includes a shell configured to be worn on a head of a user and a sensor coupled to the shell. The sensor is configured to detect deceleration of the shell below a predetermined threshold rate of deceleration and to generate a signal. The helmet further includes a communication module coupled to the shell and the sensor. The communication module is configured to receive the signal from the sensor when the sensor detects a deceleration of the shell below a predetermined threshold rate of deceleration and to generate a signal to a rescue assistance center after a predetermined time period. Other embodiments and methods are disclosed.