Garmin P79 In-Hull Smart Transducer - NMEA 2000 [010-11394-00]P79, In Hull Mount Smart Transducer, NMEA 2000 Our in hull mount smart transducer provides depth data to your NMEA 2000 network. This transducer has an operating frequency of 235 kHz and a beamwidth of 11. It accommodates deadrise angles of up to 22. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov.