I am running a Helix 9 G2N chirp si, along with a terrova T/M. I have mine running the transducer that came with the unit. If memory serves me correct the US2 is only a 2D ducer. Nothing else. You can put a very nice ducer mount from Podunk which he is a member here on CDC. I have the ss model that I modified to run two ducers, and on top a GPS puck. My unit is mounted at the bow with a "D" model ram mount. Works very good.