I have a Ranger 520VX. It has a Garmin 168 GPS on it with the transducer mounted in the bilge area. I want to put a depth and temp transducer on it. Will the new transducer work in the bilge area, or will I HAVE to mount it on the hull. If on the hull, where is the best location for this boat. You guys have helped me in the past, I'm hoping for some help here. Thanks!