This Ethernet Adapter Cable is required if you want to network (Ethernet) capabilities on a HELIX 9 Series, HELIX 10 Series, HELIX 12 CHIRP Series,  7x8 HD Series, 8x9ci HD Series, 9x9ci HD Series, 11x9ci HD Series Humminbird product.  This cable is approximately 12 inches long.   If you are networking two of these products, you will require two AS EC QDE cables plus one of our Ethernet cables.   If you are networking one HELIX 9 Series, HELIX 10 Series, HELIX 12 CHIRP Series,  7x8 HD Series, 8x9ci HD Series, 9x9ci HD Series, or 11x9ci HD Series product with a pre-2014 8x8, 9x8 or 11x8 Series product, you will only need one adapter plus one  Ethernet cable.    Software updates on some 7x8 HD and some 8x8c, 9x8c and 11x8c Series products may also be necessary.