This invention relates to system and a method for supervising a person in an area, the system comprising a mobile base (100), such as for example a wristband,attached to the person, the mobile base (100) comprising a first radio frequency tag (11) prepared for radio frequency triangulation or positioning for deciding a position of the mobile base (100) and for communicating health, safety and environment (HSE) related components, the system comprising a controller (400) in communication with the mobile base (100). Furthermore, the invention relates to a system and a method for activated communication between an object and a reader,comprising a first radio unit (11) attached to the object, the first radio unit being configured for communicating with the reader.