For a different brand -- we have the Garmin53CV and have had great luck with it -- when loaded with the Lakes chip (add$150)
https://www.amazon.com/Garmin-echoMA...+echomap&psc=1
and to answer your question about the transducer -- if your not fishing, we find a bottom view quite useless on this Lake as the contour changes so drastically and rapidly. Cool to look at periodically -- but can also scare the crap out of ya too... using it for boating is not wise as by the time it traces on the screen you've probably hit it !!