It's called a stump jumper. Built in tightwad mo. I just installed one a few weeks ago on a Lowe with Lowrance hds. They are easy to install if he makes one for your unit. They are spring loaded and designed to lift up when contacting a stump and then drop back down automatically. The are a little pricey but well made and cheaper than a new transducer if ya hit something. Just Google stump jumper transducer mount
There will be days when the fishing is better than one's most optimistic forecast, others when it is far worse. Either is a gain over just staying home.