This kit contains all of the components needed to build a small SeaTalk NG data network suitable for 3rd party engine gateway devices (sold seperately). The included 5-way connector, terminators and power cable establish basic connectivity. Use the included spur cable to connect to a Raymarine display or instrument. The supplied SeaTalk NG to DeviceNet (female) adapter creates a connection point for popular NMEA 2000 engine gateways from Mercury, Yamaha, Volvo Penta, and many other manufacturers.