There are various of electronic devices are used in the network of boat, include engine instruments, navigation instruments, fish finder, GPS receivers,  autopilots, wind measurement instruments, depth sounders, multimedia displays, security systems, sensors, and nautical chart plotters, etc. There are two sizes of cabling defined by the DeviceNet/NMEA 2000 standard for marine application, which is Min (7/8”) & Micro (M12) series. Both of these connectors & cables, you can get from SPC.