This Humminbird AS EC QDE Ethernet Adapter Cable is required if you want to network (Ethernet) capabilities on a HELIX 7 G2N Series, HELIX 9 Series, HELIX 10 Series, HELIX 12 CHIRP Series, 7x8 HD Series, 8x9ci HD Series, 9x9ci HD Series or 11x9ci HD Series Humminbird product. This cable is approximately 12 in. long. Software updates may be necessary on select 700 series models (7x8 HD), 800 series models (8x8c), 900 series models (9x8c) and 100 series models (11x8c).