This program, DSCdecoder, enables users to decode maritime mobile service messages using the Digital Selective Calling (DSC) system, as well as DGPS and Navtex broadcasts. It can decode distress and calling messages from ships and coast stations in the MF, HF and VHF bands, and Navtex messages with navigational warnings and weather forecasts. DSCdecoder can decode routine calls for test purposes, as well as calls to establish communication by other means, such as voice.