I have an XTM 9 QB 90 T transducer & I was going to use it with my 778c HD unit on the trolling motor. After some thought I have decided that I want to mount my 899ci si w/hdsi transducer on the trolling motor at the bow & run the 778c at the helm with the XTM 9 QB 90 T transducer mounted inside the hull. I have an Astro fiberglass boat. Will that transducer work for that application???