7Chapter 1. Summary1.1. SummaryPurposeThis VHF Radio is designed to be fit for the VHF carriage requirements for bothinternationally engaged vessels and locally engaged vessels and is radio transceiver forship mobile radio communication.On top of the traditional voice communication, this equipment has an additional function ofDSC alert which enables users to work on both normal-time communication and distresscommunication with the built-in DSC facility.DSC Transmission and ReceptionIn order to use DSC function, any valid user MMSI should be input first.What is DSC ?Internationally standardized by IMO(International Maritime Organization) as a part ofGMDSS(Global Maritime Distress and Safety System), DSC(Digital Selective Calling) is asemi-automatic way of making any MF/HF and VHF call.