Raymarine SeaTalkng Five Way Connector A06064. A 5-Way Connector is used to connect up to 3 white Spur cables to the Backbone. It has sockets for a total of five SeaTalkng cables: 2 Blue Backbone sockets, one at either end. 3 Spur or Drop sockets. Unused sockets should either be capped with Blanking Plugs to keep the system watertight, or Terminated.