Digital Selective Calling (DSC) ContentsDigital Selective Calling (DSC)Traditional VHF radio systems require users to listen until someone speaks, and then determine whether the call is for them. DSC ensures that calls are received by alerting or announcing the intended recipient(s) first so they are ready to listen to the subsequent message on the relevant channel. Distress callsUrgency callsSafety callsIndividual (routine) callsIndividual calls can be made to contacts saved in your Phonebook or to any station by manually entering an MMSI number.Group callsGroup calls can be made to groups of vessels sharing the same Group MMSI numbers.Position requestsThe radio can request position information from any station capable of responding to the request.PhonebookThe Phonebook can be used to save up to 100 contacts.Call logsAll DSC calls are logged.Test callsA Test Call feature is available for the purposes of testing your DSC VHF radio for correct operation.DSC set-up menu optionsPrevious topic: Wireless handset stationsNext topic: VHF operations