Digital selective calling system for controlling of communications by terrestrial waves on the Maritime Mobile Service

Maritime communications are still strongly carried out by conventional means of terrestrial links via radio using MF to VHF bands, mainly after the introduction of systematization of digital selective callings. However, a large number of the communication procedures still rely on manual intervention, thus reducing their effectiveness and giving origin to errors such as false distress callings. The system herein mentioned aims to automatically monitor those effective ship-to-shore communication links, speeding up the routing of selective calls in connection with an automatic control system of false alarm calls to improve the reliability of the Maritime Mobile Service.