931C, 937C, 957c, 958c, 1157c, HDR 610, MATRIX 10, MATRIX 12, was designed to be a better way to mount and aim any of the new "Live Sonar" Transducers from manufacturers such as Garmin, Lowrance and Humminbird. Humminbird 710297-1 XNT 9 HW MSI 150 T HELIX 7/8 (MEGA Side Imaging, Down Imaging) Dual Spectrum CHIRP with Temperature Transom Mount Transducer. // -->