I bought the unit at a boat dealership and they installed everything but doesn't appear that it was tested on the water. Work and cancer kept me off the boat for a few seasons but now all is good and getting back to it. I just checked install and it looks like both transducers were installed pointing out, not level to water line. I will be adjusting and testing next weekend. Any advice or experience will be appreciated. From what I have read and comments here, it looks like I should just need the XHS 9 HDSI 180 T that came with the unit. Thanks