Extend your basic NMEA 2000 network on your boat with Garmin s NMEA 2000 Backb...Extend your basic NMEA 2000 network on your boat with Garmin s NMEA 2000 Backbone/Drop Cables. The backbone is the main trunk of cable that will run through the boat to form the network. T-connectors can be connected along the network for plugging in...more