The SeaTalkNG Backbone kit contains everything you need to construct and wire a basic SeaTalkNG navigation network backbone on board your vessel. The kit contains the following components: A06031 SeaTalkNG Terminators (Qty. 2) A06037 Backbone Cable, 20m A06036 Backbone Cable, 5m (Qty. 2) A06028 T-Piece (Qty. 4) A06049 Network Power Cable 81300 SeaTalkNG Reference Manual ST70 Displays, transducer pods, transducers and network spurs are not included.