If you are looking for a unit to show you precise depth down to 2 ft and temperature to 0.02 of a degree, then the RD30 is the answer. Simply connect the RD30 to our new Furuno Smart Sensor and you are ready to go! The new Furuno Smart Sensor is an ingeniously engineered depth sensor, entirely encased within its own transducer housing. The Smart Sensor connects directly to the RD30 display, via the NMEA data port, without requiring any additional processor or junction box. Power is supplied to the Smart Sensor from the connected display. The Smart Sensor operates at 235kHz. This frequency was chosen for its excellent ability to provide solid performance at both high speeds and in very shallow depths. Additionally, the 235kHz frequency will not interfere with other Furuno echo sounding equipment, including any products running at 200kHz.