Once the radio is registered with the FCC, that information and your boat's information is entered in the US Coast Guard's national distress database. This unique number called a Maritime Mobile Service Identity or MMSI, is much like your cell phone number. They are also encoded with a unique nine digit FCC identification number that allows the ship-to-ship calling feature. The new DSC radios however have to be registered to work properly in emergency situations. Since 1996 recreational boaters were no longer required to have a ship's station license issued by the FCC in order to operate a VHF radio. DSC radios allow boaters to make ship-to-ship private calls and the DSC distress channel is currently being monitored by commercial ships. Satellite and digital technology used for several years on commercial ships is now available to the recreational boater. Digital Selective Calling is part of a global upgrade in maritime distress communications. Digital Selective Calling (DSC) radio is the latest in marine radio technology.
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