Need to make the GT54UHD work with a skimmer transducer like the Gt8HW9-IH. You have to call it a different transducer to make it work in the source screen which does not let you use the frequencies they were designed for. Also please make it easier to change the lake levels. I have the LakeVu G3 Ultra maps. I have changed the lake levels but the contours don't change. This can be dangerous on Kentucky Lake.