Still new to us boat (on the hard fixing her up) does not have a functioning depth sounder. Since we'll be cruising W. FL this is a must. Anyone have any experience with a Raymarine Dragonfly? Considering it vs. the standard Raymarine ST60+. On the old boat, we had a fish finder w/in hull transducer up front and it did very well.... If we go with the Dragonfly, we'd add the thru hull transducer vs. the transom mount one that comes with it....