J1939 Cable for GPSMAP; Units - 10mConnect your GPSMAP; 8400 or 8600 series chartplotter to a J1939 network to gain access to features, such as engine or generator monitoring. Like the NMEA 2000; network, the J1939 network follows a standard and uses proprietary messages.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.