Abstract: The system comprises a monitoring device, one acquisition unit and respective method for monitoring and registering the position of an individual. This disclosure is intended for the following applications: 1) prevention or assistance in the treatment of pressure ulcers (or decubitus ulcers), common in immobile patients (2) or wheelchairs users, 3) monitoring of patients suffering from dementia (which makes them do some actions (for instance: getting up from a chair) without being aware of them, and that can suffer serious accidents due to that), 4) fall detection and 5) involuntary body movements (e.g. epileptic attack). The monitoring device comprises an inertial system, with 3 or more accelerometers; a directional system, with 3 or more magnetometers; a communication module; and a processor module to obtain and communicate the inclination and direction of the device, when coupled to an individual.