A Reefer container is for cargo that needs to maintain a constant temperature. The loading position of the reefer container is fixed because the power is to be supplied consistently during loading, transportation, and unloading. SHIPMANGER-88 provides a summary list of reefer containers to check the status of the loaded reefer containers and check whether the reefer container is in a position where power gets supplied. It can transmit data on reefer container position and loading status online to RCMS(Reefer Container Monitoring System).