System which is constituted by one or more positioning devices (2), one or more localizers (1), one or several communication networks and one or several control centers (3). The localizers (1) and the positioning devices (2) have two or more communication interfaces and two or more positioning systems. The positioning devices (2) can calculate the position through some of the positioning systems and send their position via one of the communication interfaces, avoiding inoperability if one of the positioning systems or one of the communication interfaces fails to work. The localizers can perform the function of nodes (4) and forward the data of the position of a positioning devices and make them reach the localizer which has requested that information. Both the positioning devices and the localizers are mobile units. The control centers can monitor the position of the positioning devices if necessary.