Abstract: A mobile unit (5) is described for measuring running paths for handling systems, in particular bridge cranes, sliding on a route (2), comprising at least one first measuring device (62) which constitutes a space reference of the mobile unit (5) with respect to at least one fixed measuring unit (3) comprising second measuring device (61), the first measuring device (62) being connected to the mobile unit (5) by interposing at least one handling device adapted to synchronize measuring operations between the first measuring device (62) and the second measuring device (61) of the fixed measuring unit (3). A system for measuring (1) running paths for handling systems through such mobile unit (5) and a process for measuring through such system (1) are further described.