Furuno FM4850 Black Box VHF Radio w/GPS, AIS, DSC Loudhailer [FM4850]FM4850 Black Box VHF Radio with GPS, AIS, DSC & Loudhailer The Ultimate 5 In 1 Tool of VHF Radios The FM4850 is a marine Black Box VHF radiotelephone with built in Class D DSC, AIS Receiver, and Simplified Loud Hailer with intercom. Its compact housing enables it to be installed in a variety of craft, even vessels where space is limited, such as center console boats. The FM4850 handset shares a common appearance with other Furuno equipment, such as