Humminbird's Waterproof 5 Port Ethernet Switch allows you to easily connect up to five Ethernet items together. This will allow way point sharing between head units, transducer sharing, i-Pilot Link set-up and many more possibilities.

Power draw: 165 mA.

Compatible units include:

-858c, 858c HD, 858c Di, 858c HD DI, 898c SI, 898c HD SI
-958c 958c HD, 958c DI, 958c HD DI, 998c SI, 998c HD SI
-1157c, 1158c, 1158c DI, 1197c SI, 1198c SI

The below units require an AS EC QDE adapter cable to connect, they include: 

-778c HD, 788ci HD, 788ci HD DI, 798ci HD SI
-859ci HD, 859ci HD DI, 899ci HD SI
-959ci HD, 959ci HD DI, 999ci HD SI
-1159ci HD, 1159ci HD DI, 1199ci HD SI
-Helix 7 CHIRP GPS G2N
-Helix 7 CHIRP DI GPS G2N
-Helix 7 CHIRP SI GPS G2N
-All Helix 9
-All Helix 10
-All Helix 12 models
-All Solix, Onix, and Ion models