Might have this covered already, but I saw some similar, but not exact... But anyway, I got the Terrova (12V with the long shaft with the built in I-Pilot and I-Link. Got that mounted on the boat. Also got a 859 HD DI unit and sent off to the Humminbird to get the transducer to mount on the trolling motor - as I plan on this unit being mounted up in the bow (later will get a SI unit, maybe... but that is a couple more Christmas' worth of gift cards and saving). Anyway, I got the transducer mounted tonight on the trolling motor (see pics attached) but I am little concerned as everything else I have seen has the fin in the back and the transducer in the front. As you see mine is pretty much the only location that it will mount. I have two concerns, just not knowing. Is that fin going cause a shadow? I can't say for sure but it looks to maybe be in the cone of the transducer. My second concern, being that close to prop is that going to cause any interferance on the transducer? Thanks in advance. The information in this forum has been most helpful in both making the choice to go this route, configuration, and so far with the installation.