Digital Selective Calling (DSC) VHF radio communication can be crucial in a a boating or sailing emergency and provide rescuers critical GPS location information. But when buying or selling a boat equipped with this important communication device, there are a few things all boat owners should know about updating the associated identification information. The Boat Owners Association of the United States (BoatUS) offers the following practical advice to ensure that DSC-VHF information is accurate and up-to-date after a sale or purchase. That way, when you do need help, it arrives as quickly as possible. Read more.