This Ethernet Adapter Cable is required if you want to network (Ethernet) capabilities on a HELIX 7 G2N Series, Helix 7 G3N series, HELIX 8 series, HELIX 9 Series, HELIX 10 Series, HELIX 12 Series, 700 HD Series, 800ci HD Series, 900ci HD Series, 1100ci HD Series Humminbird products. This cable is approximately 12 inches long.