DSM30 & DSM300 Transducer Adapter Cable The DSM30/DSM300 Transducer Adapter Cable allows you to utilize Raymarine"s wide offering of specialty and high performance in-hull, through-hull or transom mount transducers with our new MFDs with built-in sounder. This adapter is also perfect for occaisions where a new sounder-equipped Raymarine MFD is replacing both an old display and DSM.