I have the compact transducer on the 798 in the front and the XHS 9 HDSI 180 T on the 798 in the dash. The images seem a little more detailed on the dash unit, but the compact transducer is mounted on the trolling motor. I have not had a chance to record the same object from both to compare yet, but I will and compare them on Hummviewer. I have no regrets about using the larger transducer. In reality I think the real difference is seen on the larger screens.