If you are networking two fish finders from the above list together, it will require two (2) AS EC QDE cables plus one (1) Ethernet cable of the appropriate length for your boat’s needs. For use with: HELIX 7 G2N & G3N models, all HELIX 8 models, all HELIX 9 models, all HELIX 10 models, all HELIX 12 CHIRP models, 859 models, 899 models, 959 models, 999 models, 1159 models, and 1199 models. Length 12″. AS EC QDE (Bag).