Garmin J1939 Cable f/GPSMAP Units - 10m [010-12390-30]J1939 Cable for GPSMAP Units 10m Connect 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