Re: Transom Mount Fish Finder??
Mount the transducer on the starboard side of transom down at the bottom so the face of the transducer is about level with the bottom of the boat and in an area where there is smooth water flow(not near a strake or rib or anything on the bottom that makes turbulence or bubbles), that might interfere with the signal. The transducer is shaped like a little bomb or airplane with the nose pointed in the direction of the boat. You don't want the transducer to hang down below the bottom of the hull since you could damage it while beaching or crossing a log or something. If it's flush with the boat bottom then it will be an inch or so under water even while your boat is running at speed. Use the screws for mounting and seal around with silicone or other suitable caulking to prevent leaks, run wire up and over transom to your unit, secure wire with little clips so they don't get hung up on something. Really not much to it, maybe you have instructions with your unit.
Good Luck!