Tracking Embedded objects in a transport unit

A monitoring system (1) of a set of objects (100) embedded in a transport unit (101), comprising marking devices (200) each comprising a power supply, a memory for storing an object identifier, communication means short-range wireless, and adapted to get out of a mode of saving energy upon receipt of a radio signal low frequencies (300) reader device mounted on the transport unit, for receive presence data from markers devices, a locating device (300) mounted on the transport unit for receiving location data of the transport unit from a geolocation system, and means for processing (300) arranged to compare the expected presence of the data, based on location data received, the presence of data and for emitting an alarm signal depending on the result of the comparison.