• If a boater has an emergency on the water, there’s no better way than to call for help than with a Digital Selective Calling (DSC) VHF radio which can give rescuers critical GPS location information. But that doesn’t mean these technologies come without a few quirks, especially when buying or selling a boat with DSC-VHF radios aboard. Boat Owners Association of The United States (BoatUS) has some practical advice to ensure that when you do need help, it arrives as quickly as possible.

The MMSI issue: DSC-VHF radio-equipped vessels must be registered and issued a Maritime Mobile Service Identity (MMSI) number that is then entered into the radio. Unlike a phone number that stays with you when you move across town, a boat’s MMSI always stays with the boat, so any subsequent owner must update the MMSI number with his or her new contact information. To make this easier, print a copy of your MMSI certificate, write down your registration login name and password and keep it in a safe place. This will make managing your boat’s MMSI easier if any registration details change or when it is sold to a new owner.

Hand-held DSC-VHF radios – who should get them when the boat is sold? Some boaters have both fixed-mount and hand-held DSC-VHF radios aboard, and both can share the same MMSI number. When selling, it’s wise to include any hand-held DSC-VHFs in the purchase and not take them with you to the new vessel. It would be dangerous to have the same MMSI being used by more than one vessel, and hand-held DSC-VHF radios often need to be sent to the manufacturer for a “factory reset” before they can be updated with a new MMSI number – a time-consuming process.

The international quirk: It’s OK to use your DSC-VHF radio for communications purposes when transiting foreign waters. Once you communicate with or enter a foreign port (“foreign station”), however, a US-registered boat must have a federal Ship Station License. These are only issued by the Federal Communications Commission, which also provides an appropriate internationally accessible MMSI number as part of the $220 Ship Station License fee, good for 10 years. The benefit of receiving an MMSI from the FCC is that your emergency contact information goes into an internationally accessible database (also accessible to the US Coast Guard), potentially speeding a foreign rescue. MMSI numbers not issued by the FCC are only entered into the US Coast Guard database used for domestic waters. Boaters can learn more at the BoatUS Foundation for Boating Safety and Clean Water’s free online DSC-VHF radio tutorial.

DSC-VHF radio and Automatic Identification System (AIS): While both use the vessel’s same MMSI number when it comes to registration, DSC-VHF radio and Automatic Identification System (AIS) do not share any other relationship, and each has a completely different process to follow when buying and selling a boat, or potentially when changing a boat’s name (an AIS requirement).

    Ins and outs of DSC-VHF radio when buying or selling a boat

    Here’s a helpful article that was shared with Three Sheets Northwest by our media partners at BoatUS.com… If a boater has an emergency on the water, there’s no better way than to call for help than with a Digital Selective Calling (DSC) VHF radio which ...

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