The DSM30/DSM300 Transducer Adapter Cable allows you to utilize Raymarine's wide offering of specialty and high-performance in-hull, thru-hull, or transom-mount transducers with multifunction displays that have a built-in sounder. This adapter is also perfect for occasions where a new sounder-equipped Raymarine MFD is replacing both an old display and a DSM. Part#: E66066. Ideal when replacing an old MFD and a DSM