I just installed an Eagle Fish Finder on my
1993 Hunter23.5. My wife bought it for me years ago when I had a ppontoon boat. It was a transom mounted transducer. On the 23.5 I used epoxy to glue the transducer ( some of the newer units have a puck to shoot through the hull) to the inside of the hull (inside the starboard quarter locker under the birth, next to the water ballast tank). I first hooked up the unit. I used a zip lock baggie full of water. I placed it against the hull and put the transducer inside to be sure I could get a reading through the hull. Once I found the best spot I placed a piece (3" diameter) PCV pipe about 4" high on the bottom of the insdie of the hull. I put about 1 to 2 inches of clear marine epoxy into it and worked out all the bubbles. I then set the transducer into the epoxy, double checked to be sure I could get a reading, and then proped it up and let it to dry, glued to the hull. In about 90 minutes, it was ready.I then ran all the electric lines underneath to the battery. From the battery I ran the cable up through the locker cover under the starboard inside seat, behind the back of the seat and then used suction cups with small hooks on the indside of the hull to lead the wires out to the dispaly terminal. I mounted the disply on a piece of teak and sit it on the hatch cover glass when sailing. I can see it from anywhere in the cockpit, and didn't have to drill a hole in the decking or hull. I also get to lock it up when I leave the boat.There is an article on shooting through the hull in the April or May Sail Magazine.There have been a bunch of articles on this in the HOW forum.You'll feel better about drinking a beer when you have a depth finder to avoid going aground.Good luck.Hayden @ hayden_jones@renolan.com