A computerised system for managing personnel's movements in an industrial plant, the computerised system comprising: - one or more navigation devices , each comprising a support structure mechanically supporting or accommodating the components of said navigation device and wearable by a user or mechanically couplable to a product item wearable by a user, wherein each navigation device includes a control unit capable of communicating in a wireless mode with a remote or proximal computerised entity and a user-interface unit operatively coupled with said control unit and adapted to provide the user with guiding signals (GS) perceivable by the user and configured to direct the user according to predefined directions; - a computerised platform capable of communicating in a wireless mode with said navigation devices, said computerised platform being configured to control and coordinate the operation of said navigation devices; wherein, said computerised platform is configured to provide the control unit of each navigation device with first guiding information (G1) in order to guide the user of said navigation device along a planned route through said industrial plant; wherein, the control unit of said navigation device is configured to command, based on said first guiding information (G1), the user-interface unit of said navigation device to provide the user of said navigation device with said guiding signals (GS) according to a sequential order in such a way to direct the user of said navigation device along said planned route; wherein said computerised platform is configured to modify said planned route to be followed by the user wearing one of said navigation devices based on tracking data (TD) indicative of the movements of other personnel and of the movements of possible automatic guided vehicles operating in said industrial plant. - one or more navigation devices , each comprising a support structure mechanically supporting or accommodating the components of said navigation device and wearable by a user or mechanically couplable to a product item wearable by a user, wherein each navigation device includes a control unit capable of communicating in a wireless mode with a remote or proximal computerised entity and a user-interface unit operatively coupled with said control unit and adapted to provide the user with guiding signals (GS) perceivable by the user and configured to direct the user according to predefined directions; - a computerised platform capable of communicating in a wireless mode with said navigation devices, said computerised platform being configured to control and coordinate the operation of said navigation devices; wherein, said computerised platform is configured to provide the control unit of each navigation device with first guiding information (G1) in order to guide the user of said navigation device along a planned route through said industrial plant; wherein, the control unit of said navigation device is configured to command, based on said first guiding information (G1), the user-interface unit of said navigation device to provide the user of said navigation device with said guiding signals (GS) according to a sequential order in such a way to direct the user of said navigation device along said planned route; wherein said computerised platform is configured to modify said planned route to be followed by the user wearing one of said navigation devices based on tracking data (TD) indicative of the movements of other personnel and of the movements of possible automatic guided vehicles operating in said industrial plant. <EOS>