After reading all the comments... I run a HB898c HD SI unit on the stern and an older HB 778 for 2d using the US2 (200/83kHz) in my Terrova. I have a 19 ft boat and mainly fish 8 ~ 10 ft water. Occasionally 15 ~ 20 ft. Have never had any issue that I am aware of with crosstalk. Works well and having the Ethernet has been a big help for this rookie.