Systems, devices, and methods for detecting movement of a user, comprising a portable device, database, and controller, portable device including a sensor assembly and processor, the sensor assembly having a sensor configurable to perform a first measurement, the processor configurable to compare the first measurement to a threshold value, and also configurable to transmit a code when the processor determines, based on the compare, that the first measurement is greater than or equal to the threshold value, the controller being configurable to receive a communication signal having the code and the controller also configurable to obtain, from the received communication signal, the code, and further the controller also configurable to display, on a graphical display, a notification message which includes at least an identification of the portable device user.
